THERMOCHEMISTRY CHAPTER 11

Size: px
Start display at page:

Download "THERMOCHEMISTRY CHAPTER 11"

Transcription

1 THERMOCHEMISTRY CHAPTER 11

2 ENERGY AND HEAT nthermochemistry: The study of the energy changes that accompany chemical reactions and changes in the physical states of matter.

3 ENERGY AND HEAT nwork: Energy used moving objects against a force. nformula: Work = Force * Distance

4 ENERGY AND HEAT nheat: Energy transfer from one object to another. Represented by the symbol q.

5 ENERGY AND HEAT nenergy: The ability to do work or supply heat.

6 ENERGY AND HEAT n There are two main types of energy: A. Kinetic: Energy of motion

7 B. Potential: ENERGY AND HEAT Energy of position ninternal Energy The sum of the kinetic and potential energies of the particles making up a substance.

8 nsystem: ENERGY AND HEAT That which is under study, e.g.. a reaction. nsurroundings: Everything outside of the system.

9 ENERGY AND HEAT nuniverse: System + surroundings.

10 ENERGY AND HEAT nthere are two types of thermodynamic reactions: A. Endothermic B. Exothermic

11 ENERGY AND HEAT A. Endothermic: A chemical reaction or physical change in which heat is absorbed (q is positive).

12 ENERGY AND HEAT B. Exothermic: A chemical reaction or physical change in which heat is released (q is negative).

13 ENERGY AND HEAT n media_portfolio/text_images/019_thermi TE.MOV

14 ENERGY AND HEAT nlaw of Conservation of Energy: Energy cannot be created or destroyed.

15 Measuring Heat ncalorie: A.The amount of heat energy needed to raise 1 g H 2 O at 1 C. B. 1 cal = Joule

16 Measuring Heat njoule: A.The SI unit for energy B. One joule of heat raises the T of 1 g of water. C. 1 J = cal

17 Measuring Heat nspecific heat capacity (C) or (Cp) A. The amount of heat needed to raise the temperature of 1 gram of a substance by 1 C

18 Measuring Heat B. Equation: q = m x c x ΔT q = heat m= mass of material c = specific heat ΔT = change in T

19 Measuring Heat C. Units are J/g C.

20 nheat Capacity Measuring Heat A. An object's ability to absorb or release heat.

21 Measuring Heat B. Depends on the product of its specific heat capacity and the mass. ( c x m)

22 Measuring Heat C. Depends on heat divided by the change in temperature (q/ T).

23 D. Units are Measuring Heat usually J/ C.

24 Measuring Heat Examples: 1. The T of Cu with a mass of 95.4 g increases from 25 C to 48 C when the metal absorbs 849 J. What is the specific heat capacity of Cu?

25 Given: m = 95.4 g q = 849 J T 1 = 25 C T 2 = 48 C T = 23 C

26 Formula: q = m x c x T c = q m x T

27 c = 849 J 95.4 g x 23 C = J / g C

28 2. How much heat is required to raise the temperature of g of Hg to 52 C?

29 Given: C = 0.14 J/g C m = 250 g T = 52 C

30 Formula: q = m x c x T q = 250 g x J / g C x 52 C = 1820 J = 1.82 kj

31 3. Calculate the mass of water required to change the temperature to 56 C and produce 1324 J of energy?

32 Given: q = 1324 J C = J/g C T = 56 C m =?

33 Formula: q = mc T m = q c T

34 m = 1324 J (4.184J /g C) (56 C) = 5.66 g

35 Calorimetry nwe can determine the heat flow ( H rxn ) associated with a chemical reaction by measuring the temperature change it produces.

36 Calorimetry ncalorimetry is The measurement of heat flow.

37 Calorimetry na calorimeter is An apparatus that measures heat flow.

38 Calorimetry nthere are two types: 1. Coffee cup 2. Bomb calorimeter

39 ncoffee cup Calorimetry A. Constant Pressure B. Used in heat changes involving reactions in aqueous solutions.

40 Calorimetry C. The reaction occurs in a known volume of water.

41

42 Calorimetry nbomb Calorimeter: A. Constant Volume B. Used to measure heat flows for gases and high temperature reactions.

43

44 Enthalpy A. The variable H B. The energy gained or lost C. q = H

45 nexample 1: 50 ml of 1.0 M HCl and 50 ml of NaOH are combined in a constant pressure calorimeter. The temperature of the solution is observed to rise from 21.0 C to 27.5 C. Calculate the enthalpy change for the reaction (assume density is 1.0 gram/ml, and that the specific heat of the solution is that of water).

46 T = 6.5 C c= 4.18 J/g C m = 100 ml x 1 g/ml = 100 g H solution =?

47 Formula: H solution = mc T (100 g)(4.18 J/g C) (6.5 C) = 2717 J

48 nthe heat absorbed by an aqueous solvent is equal to the heat given off by the reaction of the solutes: nq aq solution = -q rxn

49 Final answer is J

50 Why?

51 Because we were looking for the q rxn

52 Exothermic or Endothermic??

53 Exothermic Why? Negative sign

54 Example 2: A small pebble is heated and placed in a foam cup calorimeter containing 25 ml of water at 25 C. The water reaches a maximum temperature of 26.4 C. How many joules of heat were released by the pebble?

55 T = 1.4 C c = 4.18 J/g C m = 25 ml x 1 g 1 ml = 25 g

56 Formula: H = mc T = (25 g) (4.18 J/g C) (1.4 C) = 146 J

57 Exothermic or Endothermic?

58 Endothermic Because it is positive.

59 Thermochemical Equations nan equation that includes the heat change ( H) for the reaction.

60 Thermochemical Equations nexamples: n2n(g) N 2 (g) H = -941 kj no 2 (g) 2O(g) H = +502 kj

61 Enthalpies of Phase Changes nenthalpy of fusion ( H fus ): Heat to melt 1 mole of solid to liquid. Always positive.

62 Enthalpies of Phase Changes nenthalpy of Vaporization ( H vap ): Heat to evaporate 1 mol of liquid Always positive.

63 Enthalpies of Phase Changes nenthalpy of Condensation ( H cond ): Heat released when 1 mol of vapor condenses. Always negative.

64 Examples: 1. How many grams of ice at 0 C & Pa could be melted by the addition of 2.25 kj of heat?

65 What kind of phase change is it? Fusion

66 Find the H fus for water 1 mol = 6.01 kj What are you looking for? Mass of ice melted

67 2.25 kj 1 mol 6.01 kj 18 g H 2 O 1 mol H fus GFM H 2 O = g

68 2. How much heat in kj is absorbed when 63.7 g H 2 O (l) at 100 C is converted to steam at 100 C?

69 What kind of phase change is it? Vaporization

70 Find the H vap for water 1 mol = 40.7 kj What are you looking for? Amount of heat

71 63.7 g H 2 O 1 mol 18 g H 2 O GFM H 2 O 40.7 kj 1 mol H vap = 144 kj

72 Enthalpy of formation ( H f ) nthe enthalpy associated with the reaction that forms a compound from its elements in their most thermodynamically stable states.

73 Enthalpy of formation ( H f ) n Equal to In the above reaction, n and m are the coefficients of the products and the reactants in the balanced equation.

74 Example: Calculate the heat given off when one mole of B 5 H 9 reacts with excess oxygen according to the following reaction: 2 B 5 H 9 (g) + 12 O 2 (g) 5 B 2 O 3 (g) + 9 H 2 O (g)

75 Compound B 5 H 9 H f 73.2 kj/mol B 2 O kj/mol O 2 0 kj/mol H 2 O kj/mol

76 Sum of Reactants 2 mol B 5 H kj = kj 1 mol 12 mol O 2 0 kj 1 mol = 0 kj

77 Sum of Reactants: kj + 0 kj = kj

78 Sum of Products 5 mol B 2 O kj = 1 mol kj

79 Sum of Products 9 mol H 2 O kj = 1 mol kj

80 Sum of Products kj kj = kj

81 H = kj kj H products H reactants = kj

82 Hess s Law nheat transferred, or change in enthalpy (H), in a reaction is the same regardless whether the reaction occurs in a single step or in several steps.

83 Hess s Law nif a series of reactions are added together, the net change in the heat of the reaction is the sum of the enthalpy changes for each step.

84 Hess s Law n Rules for Using Hess s Law: 1. If the reaction is multiplied (or divided) by number, H must also be multiplied (or divided) by that number.

85 Hess s Law 2. If the reaction is reversed (flipped), the sign of H must also be reversed.

86 Hess s Law nexample: Nitrogen and oxygen gas combine to form nitrogen dioxide according to the following reaction: N 2 (g) + 2 O 2 2 NO 2 (g)

87 Hess s Law Calculate the change in enthalpy for the above overall reaction, given:

88 N 2 (g) + O 2 (g) 2NO (g) 2 NO (g) + O 2 (g) 2 NO 2 (g) N 2 (g) + 2 O 2 (g) 2 NO 2 (g) ΔH = 181 kj kj = 50 kj

89 From the following enthalpy changes: OF 2 (g) + H 2 O (l) O 2 (g) + 2 HF (g) H = -277 kj SF 4 (g) + 2 H 2 O (l) SO 2 (g) + 4 HF (g) H = -828 kj S (g) + O 2 (g) SO 2 (g) H =-297 kj

90 Calculate the value of H for the reaction: 2 S (g) + 2 OF 2 (g) SO 2 (g) + SF 4 (g) TARGET

91 OF 2 (g) + H 2 O (l) O 2 (g) + 2 HF (g) How do you need to change this equation to look like the target equation? 2 S (g) + 2 OF 2 (g) SO 2 (g) + SF 4 (g) Multiply it by 2

92 SF 4 (g) + 2 H 2 O (l) SO 2 (g) + 4 HF (g) How do you need to change this equation to look like the target equation? 2S(g) + 2 OF 2 (g) SO 2 (g) + SF 4 (g) Flip the equation

93 S (g) + O 2 (g) SO 2 (g) How do you need to change this equation to look like the target equation? 2S(g) + 2 OF 2 (g) SO 2 (g) + SF 4 (g) Multiply by 2

94 2 OF 2 (g) + 2 H 2 O (l) 2 O 2 (g) + 4 HF (g) SO 2 (g) + 4 HF (g) SF 4 (g) + 2 H 2 O (l) 2 S(g) + 2 O 2 (g) 2 SO 2 (g) 2 S(g) + 2 OF 2 (g) SO 2 (g) + SF 4 (g)

95 ΔH = -554 kj kj kj = -320 kj

Enthalpies of Reaction

Enthalpies of Reaction Enthalpies of Reaction Enthalpy is an extensive property Magnitude of H is directly related to the amount of reactant used up in a process. CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O(l) H = 890 kj 2CH 4 (g)

More information

Chapter 5 Thermochemistry

Chapter 5 Thermochemistry Chapter 5 Thermochemistry Section 17.1 The Flow of Energy Heat and Work OBJECTIVES: Explain how energy, heat, and work are related. 2 Section 17.1 The Flow of Energy Heat and Work OBJECTIVES: Classify

More information

Chapter 8. Thermochemistry 강의개요. 8.1 Principles of Heat Flow. 2) Magnitude of Heat Flow. 1) State Properties. Basic concepts : study of heat flow

Chapter 8. Thermochemistry 강의개요. 8.1 Principles of Heat Flow. 2) Magnitude of Heat Flow. 1) State Properties. Basic concepts : study of heat flow 강의개요 Basic concepts : study of heat flow Chapter 8 Thermochemistry Calorimetry : experimental measurement of the magnitude and direction of heat flow Thermochemical Equations Copyright 2005 연세대학교이학계열일반화학및실험

More information

Name Date Class THE FLOW OF ENERGY HEAT AND WORK

Name Date Class THE FLOW OF ENERGY HEAT AND WORK 17.1 THE FLOW OF ENERGY HEAT AND WORK Section Review Objectives Explain the relationship between energy, heat, and work Distinguish between exothermic and endothermic processes Distinguish between heat

More information

Reaction Energy. Thermochemistry

Reaction Energy. Thermochemistry Reaction Energy Thermochemistry Thermochemistry The study of the transfers of energy as heat that accompany chemical reactions & physical changes Thermochemistry -In studying heat changes, think of defining

More information

Chapter 11. Thermochemistry: Heat & Chemical Change

Chapter 11. Thermochemistry: Heat & Chemical Change Chapter 11 Thermochemistry: Heat & Chemical Change The Flow of Energy Thermochemistry: Study of heat changes that occur during physical processes and chemical reactions Energy Energy is the capacity to

More information

Ch. 17 Thermochemistry

Ch. 17 Thermochemistry Ch. 17 Thermochemistry 17.1 The Flow of Energy Energy Transformations Thermochemistry: study of energy changes in chemical reactions and changes in state Chemical potential energy: energy stored in bonds

More information

The Nature of Energy Energy is the ability to do work or produce Heat, q or Q, is ; flows due to temperature differences (always to )

The Nature of Energy Energy is the ability to do work or produce Heat, q or Q, is ; flows due to temperature differences (always to ) CP Chapter 17 Thermochemistry 2014-2015 Thermochemistry Thermochemistry is the study of energy that occur during chemical and physical changes (changes of state) The Nature of Energy Energy is the ability

More information

Chapter 17 Thermochemistry

Chapter 17 Thermochemistry Chapter 17 Thermochemistry Section 17.1 The Flow of Energy Heat and Work OBJECTIVES: Explain how energy, heat, and work are related. 2 Section 17.1 The Flow of Energy Heat and Work OBJECTIVES: Classify

More information

Thermochemistry. Energy and Chemical Change

Thermochemistry. Energy and Chemical Change Thermochemistry Energy and Chemical Change Energy Energy can change for and flow, but it is always conserved. The Nature of Energy Energy the ability to do work or produce heat Potential energy Kinetic

More information

Energy Transformations

Energy Transformations Thermochemistry Energy Transformations Thermochemistry - concerned with heat changes that occur during chemical reactions Energy - capacity for doing work or supplying heat weightless, odorless, tasteless

More information

CHAPTER 17 Thermochemistry

CHAPTER 17 Thermochemistry CHAPTER 17 Thermochemistry Thermochemistry The study of the heat changes that occur during chemical reactions and physical changes of state. Chemical Change: new substances created during chemical reaction

More information

Thermochemistry. Energy and Chemical Change

Thermochemistry. Energy and Chemical Change Thermochemistry Energy and Chemical Change Energy Energy can change for and flow, but it is always conserved. The Nature of Energy Energy the ability to do work or produce heat Potential energy Kinetic

More information

Thermochemistry: the study of energy (in the from of heat) changes that accompany physical & chemical changes

Thermochemistry: the study of energy (in the from of heat) changes that accompany physical & chemical changes Thermochemistry Thermochemistry: the study of energy (in the from of heat) changes that accompany physical & chemical changes heat flows from high to low (hot cool) endothermic reactions: absorb energy

More information

First Law of Thermodynamics

First Law of Thermodynamics Energy Energy: ability to do work or produce heat. Types of energy 1) Potential energy - energy possessed by objects due to position or arrangement of particles. Forms of potential energy - electrical,

More information

Types of Energy Calorimetry q = mc T Thermochemical Equations Hess s Law Spontaneity, Entropy, Gibb s Free energy

Types of Energy Calorimetry q = mc T Thermochemical Equations Hess s Law Spontaneity, Entropy, Gibb s Free energy Unit 7: Energy Outline Types of Energy Calorimetry q = mc T Thermochemical Equations Hess s Law Spontaneity, Entropy, Gibb s Free energy Energy Energy is the ability to do work or produce heat. The energy

More information

CP Chapter 17 Thermochemistry

CP Chapter 17 Thermochemistry CP Chapter 17 Thermochemistry Thermochemistry Thermochemistry is the study of energy that occur during chemical reactions and phase changes (changes of state) The Nature of Energy Energy is the ability

More information

Chapter 5. Thermochemistry

Chapter 5. Thermochemistry Chapter 5 Thermochemistry Dr. A. Al-Saadi 1 Preview Introduction to thermochemistry: Potential energy and kinetic energy. Chemical energy. Internal energy, work and heat. Exothermic vs. endothermic reactions.

More information

Thermochemistry. Energy. 1st Law of Thermodynamics. Enthalpy / Calorimetry. Enthalpy of Formation

Thermochemistry. Energy. 1st Law of Thermodynamics. Enthalpy / Calorimetry. Enthalpy of Formation THERMOCHEMISTRY Thermochemistry Energy 1st Law of Thermodynamics Enthalpy / Calorimetry Hess' Law Enthalpy of Formation The Nature of Energy Kinetic Energy and Potential Energy Kinetic energy is the energy

More information

Ch. 6 Enthalpy Changes

Ch. 6 Enthalpy Changes Ch. 6 Enthalpy Changes Energy: The capacity to do work. In Physics, there are 2 main types of energy Kinetic (energy of motion) = ½ mv 2 Potential (energy of position due to gravity)= mgh In Chemistry,

More information

8.6 The Thermodynamic Standard State

8.6 The Thermodynamic Standard State 8.6 The Thermodynamic Standard State The value of H reported for a reaction depends on the number of moles of reactants...or how much matter is contained in the system C 3 H 8 (g) + 5O 2 (g) > 3CO 2 (g)

More information

Chapter 5 Thermochemistry. 許富銀 ( Hsu Fu-Yin)

Chapter 5 Thermochemistry. 許富銀 ( Hsu Fu-Yin) Chapter 5 Thermochemistry 許富銀 ( Hsu Fu-Yin) 1 Thermodynamics The study of energy and its transformations is known as thermodynamics The relationships between chemical reactions and energy changes that

More information

Section 9: Thermodynamics and Energy

Section 9: Thermodynamics and Energy Section 9: Thermodynamics and Energy The following maps the videos in this section to the Texas Essential Knowledge and Skills for Science TAC 112.35(c). 9.01 Law of Conservation of Energy Chemistry (11)(A)

More information

Thermochemistry. Section The flow of energy

Thermochemistry. Section The flow of energy Thermochemistry Section 17.1 - The flow of energy What is Energy? Energy is the capacity for doing work or supplying heat Energy does not have mass or volume, and it can only be detected because of its

More information

The Nature of Energy. Chapter Six: Kinetic vs. Potential Energy. Energy and Work. Temperature vs. Heat

The Nature of Energy. Chapter Six: Kinetic vs. Potential Energy. Energy and Work. Temperature vs. Heat The Nature of Energy Chapter Six: THERMOCHEMISTRY Thermodynamics is the study of energy and its transformations. Thermochemistry is the study of the relationship between chemical reactions and energy changes

More information

Name: General Chemistry Chapter 11 Thermochemistry- Heat and Chemical Change

Name: General Chemistry Chapter 11 Thermochemistry- Heat and Chemical Change Name: General Chemistry Chapter 11 Thermochemistry- Heat and Chemical Change Notepack 1 Section 11.1: The Flow of Energy Heat (Pages 293 299) 1. Define the following terms: a. Thermochemistry b. Energy

More information

17.4 Calculating Heats Essential Understanding Heats of reaction can be calculated when it is difficult or

17.4 Calculating Heats Essential Understanding Heats of reaction can be calculated when it is difficult or 17.4 Calculating Heats of Reaction Essential Understanding Heats of reaction can be calculated when it is difficult or impossible to measure them directly. Lesson Summary Hess s Law Hess s law provides

More information

Chapter 11. Thermochemistry. 1. Let s begin by previewing the chapter (Page 292). 2. We will partner read Pages

Chapter 11. Thermochemistry. 1. Let s begin by previewing the chapter (Page 292). 2. We will partner read Pages Chapter 11 Thermochemistry 1. Let s begin by previewing the chapter (Page 292). 2. We will partner read Pages 293-94 The Flow of energy - heat Thermochemistry concerned with the heat changes that occur

More information

Thermochemistry: Heat and Chemical Change

Thermochemistry: Heat and Chemical Change Thermochemistry: Heat and Chemical Change 1 Heat or Thermal Energy (q) Heat is a form of energy Is heat the same as temperature? Heat flows between two objects at different temperatures. Hot Cold 2 Chemical

More information

Name Date Class SECTION 16.1 PROPERTIES OF SOLUTIONS

Name Date Class SECTION 16.1 PROPERTIES OF SOLUTIONS SOLUTIONS Practice Problems In your notebook, solve the following problems. SECTION 16.1 PROPERTIES OF SOLUTIONS 1. The solubility of CO 2 in water at 1.22 atm is 0.54 g/l. What is the solubility of carbon

More information

Thermochemistry: Energy Flow and Chemical Reactions

Thermochemistry: Energy Flow and Chemical Reactions Thermochemistry: Energy Flow and Chemical Reactions Outline thermodynamics internal energy definition, first law enthalpy definition, energy diagrams, calorimetry, theoretical calculation (heats of formation

More information

Energy. Different types of energy exist (heat, potential, kinetic, chemical, nuclear etc.)

Energy. Different types of energy exist (heat, potential, kinetic, chemical, nuclear etc.) Change in Energy Energy Different types of energy exist (heat, potential, kinetic, chemical, nuclear etc.) Heat - the energy transferred between objects that are at different temperatures. Unit of heat

More information

Energy Ability to produce change or do work. First Law of Thermodynamics. Heat (q) Quantity of thermal energy

Energy Ability to produce change or do work. First Law of Thermodynamics. Heat (q) Quantity of thermal energy THERMOCHEMISTRY Thermodynamics Study of energy and its interconversions Energy is TRANSFORMED in a chemical reaction (POTENTIAL to KINETIC) HEAT (energy transfer) is also usually produced or absorbed -SYSTEM:

More information

Energy Ability to produce change or do work. First Law of Thermodynamics. Heat (q) Quantity of thermal energy

Energy Ability to produce change or do work. First Law of Thermodynamics. Heat (q) Quantity of thermal energy THERMOCHEMISTRY Thermodynamics Study of energy and its interconversions Energy is TRANSFORMED in a chemical reaction (POTENTIAL to KINETIC) HEAT (energy transfer) is also usually produced or absorbed -SYSTEM:

More information

CHEM 1105 S10 March 11 & 14, 2014

CHEM 1105 S10 March 11 & 14, 2014 CHEM 1105 S10 March 11 & 14, 2014 Today s topics: Thermochemistry (Chapter 6) Basic definitions Calorimetry Enthalpy Thermochemical equations Calculating heats of reaction Hess s Law Energy and Heat Some

More information

Name Class Date. As you read Lesson 17.1, use the cause and effect chart below. Complete the chart with the terms system and surroundings.

Name Class Date. As you read Lesson 17.1, use the cause and effect chart below. Complete the chart with the terms system and surroundings. Name Class Date Thermochemistry 17.1 The Flow of Energy As you read Lesson 17.1, use the cause and effect chart below. Complete the chart with the terms system and surroundings. Process Cause Effect endothermic

More information

Thermochemistry-Part 1

Thermochemistry-Part 1 Brad Collins Thermochemistry-Part 1 Chapter 7 Thermochemistry Thermodynamics: The study of energy Thermochemistry: The study of energy in chemical reactions Energy: The capacity to do work Work = force

More information

Name: Thermochemistry. Practice Test C. General Chemistry Honors Chemistry

Name: Thermochemistry. Practice Test C. General Chemistry Honors Chemistry Name: Thermochemistry C Practice Test C General Chemistry Honors Chemistry 1 Objective 1: Use the relationship between mass, specific heat, and temperature change to calculate the heat flow during a chemical

More information

I. The Nature of Energy A. Energy

I. The Nature of Energy A. Energy I. The Nature of Energy A. Energy is the ability to do work or produce heat. It exists in 2 forms: 1. Potential energy is energy due to the composition or position of an object. 2. Kinetic energy is energy

More information

Chapter 8. Thermochemistry

Chapter 8. Thermochemistry Chapter 8 Thermochemistry Copyright 2001 by Harcourt, Inc. All rights reserved. Requests for permission to make copies of any part of the work should be mailed to the following address: Permissions Department,

More information

Energy and Chemical Change

Energy and Chemical Change Energy and Chemical Change Section 15.1 Energy Section 15.2 Heat Section 15.3 Thermochemical Equations Section 15.4 Calculating Enthalpy Change Section 15.5 Reaction Spontaneity Click a hyperlink or folder

More information

Brown, LeMay Ch 5 AP Chemistry Monta Vista High School

Brown, LeMay Ch 5 AP Chemistry Monta Vista High School Brown, LeMay Ch 5 AP Chemistry Monta Vista High School 1 From Greek therme (heat); study of energy changes in chemical reactions Energy: capacity do work or transfer heat Joules (J), kilo joules (kj) or

More information

Chemical Thermodynamics

Chemical Thermodynamics Chemical Thermodynamics 1 Thermodynamics Thermodynamics is a Greek term which means, heat power. Thermodynamics is the study of energy and its transformations. 2 Thermodynamics Thermochemistry how we observe,

More information

Chapter 5 Thermochemistry

Chapter 5 Thermochemistry Chapter 5 Thermochemistry Learning Outcomes: Interconvert energy units Distinguish between the system and the surroundings in thermodynamics Calculate internal energy from heat and work and state sign

More information

Energy and Chemical Change

Energy and Chemical Change Energy and Chemical Change Section 16.1 Energy In your textbook, read about the nature of energy. In the space at the left, write true if the statement is true; if the statement is false, change the italicized

More information

Name: Class: Date: ID: A

Name: Class: Date: ID: A Name: Class: _ Date: _ ID: A Chpter 17 review Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of these phase changes is an endothermic process? a.

More information

Chemistry Chapter 16. Reaction Energy

Chemistry Chapter 16. Reaction Energy Chemistry Reaction Energy Section 16.1.I Thermochemistry Objectives Define temperature and state the units in which it is measured. Define heat and state its units. Perform specific-heat calculations.

More information

17.2 Thermochemical Equations

17.2 Thermochemical Equations 17.2. Thermochemical Equations www.ck12.org 17.2 Thermochemical Equations Lesson Objectives Define enthalpy, and know the conditions under which the enthalpy change in a reaction is equal to the heat absorbed

More information

Law of conservation of energy: energy cannot be created or destroyed, only transferred One object to another One type of energy to another

Law of conservation of energy: energy cannot be created or destroyed, only transferred One object to another One type of energy to another ch6blank Page 1 Chapter 6: Thermochemistry Thermochemistry: study of the relationships between chemistry and energy Energy: capacity to do work Work:result of a force acting over a certain distance, one

More information

Chapter 15 Energy and Chemical Change

Chapter 15 Energy and Chemical Change Chapter 15 Energy and Chemical Change Chemical reactions usually absorb or release energy. Section 1: Energy Section 2: Heat Section 3: Thermochemical Equations Section 4: Calculating Enthalpy Change Section

More information

To calculate heat (q) for a given temperature change: heat (q) = (specific heat) (mass) ( T) where T = T f T i

To calculate heat (q) for a given temperature change: heat (q) = (specific heat) (mass) ( T) where T = T f T i Use your textbook or other resources available to answer the following questions General Information: Thermochemistry Phase Change A change in the physical form/state but not a change in the chemical identity

More information

Measuring and Expressing Enthalpy Changes. Copyright Pearson Prentice Hall. Measuring and Expressing Enthalpy Changes. Calorimetry

Measuring and Expressing Enthalpy Changes. Copyright Pearson Prentice Hall. Measuring and Expressing Enthalpy Changes. Calorimetry Measuring and Expressing Enthalpy Changes A burning match releases heat to its surroundings in all directions. How much heat does this exothermic reaction release? You will learn to measure heat flow in

More information

Mr Chiasson Advanced Chemistry 12 / Chemistry 12 1 Unit B: Thermochemical Changes

Mr Chiasson Advanced Chemistry 12 / Chemistry 12 1 Unit B: Thermochemical Changes Mr Chiasson Advanced Chemistry 12 / Chemistry 12 1 Unit B: Thermochemical Changes Students will be expected to: Compare the molar enthalpies of several combustion reactions involving organic compounds.

More information

Energy and Chemical Change

Energy and Chemical Change Energy and Chemical Change Section 15.1 Energy In your textbook, read about the nature of energy. In the space at the left, write true if the statement is true; if the statement is false, change the italicized

More information

Chemistry: The Central Science. Chapter 5: Thermochemistry

Chemistry: The Central Science. Chapter 5: Thermochemistry Chemistry: The Central Science Chapter 5: Thermochemistry Study of energy and its transformations is called thermodynamics Portion of thermodynamics that involves the relationships between chemical and

More information

Thermochemistry. Questions to ponder. Because 4/20/14. an ice-cube? an ice-cube? Part 2: Calorimetry. But I KNOW. Q=mc T, but T=0

Thermochemistry. Questions to ponder. Because 4/20/14. an ice-cube? an ice-cube? Part 2: Calorimetry. But I KNOW. Q=mc T, but T=0 Thermochemistry Part 2: Calorimetry p p If you leave your keys and your chemistry book sitting in the sun on a hot summer day, which one is hotter? Why is there a difference in temperature between the

More information

_ + Units of Energy. Energy in Thermochemistry. Thermochemistry. Energy flow between system and surroundings. 100º C heat 50º C

_ + Units of Energy. Energy in Thermochemistry. Thermochemistry. Energy flow between system and surroundings. 100º C heat 50º C Units of Energy Like we saw with pressure, many different units are used throughout the world for energy. SI unit for energy 1kg m 1J = 2 s 2 Joule (J) calorie (cal) erg (erg) electron volts (ev) British

More information

3.2 Calorimetry and Enthalpy

3.2 Calorimetry and Enthalpy 3.2 Calorimetry and Enthalpy Heat Capacity Specific heat capacity (c) is the quantity of thermal energy required to raise the temperature of 1 g of a substance by 1 C. The SI units for specific heat capacity

More information

Chapter 5 - Thermochemistry

Chapter 5 - Thermochemistry Chapter 5 - Thermochemistry Study of energy changes that accompany chemical rx s. I) Nature of Energy Energy / Capacity to do work Mechanical Work w = F x d Heat energy - energy used to cause the temperature

More information

Chapter 6: Thermochemistry

Chapter 6: Thermochemistry Chapter 6: Thermochemistry 1. Light the Furnace: The Nature of Energy and Its Transformations a. Thermochemistry is the study of the relationships between chemistry and energy i. This means that we will

More information

2 Copyright Pearson Education, Inc., or its affiliates. All Rights Reserved.

2 Copyright Pearson Education, Inc., or its affiliates. All Rights Reserved. CHEMISTRY & YOU Chapter 17 Thermochemistry 17.1 The Flow of Energy 17. Measuring and Expressing Enthalpy Changes 17.3 Heat in Changes of State 17.4 Calculating Heats of Reaction Why does sweating help

More information

CHAPTER 17: THERMOCHEMISTRY. Mrs. Brayfield

CHAPTER 17: THERMOCHEMISTRY. Mrs. Brayfield CHAPTER 17: THERMOCHEMISTRY Mrs. Brayfield REVIEW What is the law of conservation of energy? It states that energy cannot be created or destroyed So the energy of any process is the same THERMOCHEMISTRY

More information

Chapter 6. Thermochemistry

Chapter 6. Thermochemistry Chapter 6. Thermochemistry 1 1. Terms to Know: thermodynamics thermochemistry energy kinetic energy potential energy heat heat vs. temperature work work of expanding gases work of expanding gases under

More information

Thermochemistry. The study of the ENERGY CHANGES that accompany changes in matter. 3 Ways: Monday, February 3, 2014

Thermochemistry. The study of the ENERGY CHANGES that accompany changes in matter. 3 Ways: Monday, February 3, 2014 Thermochemistry The study of the ENERGY CHANGES that accompany changes in matter 3 Ways: 1 Thermodynamics FIRST LAW OF THERMODYNAMICS the total amount of energy in the universe is constant (conservation

More information

Learning Check. How much heat, q, is required to raise the temperature of 1000 kg of iron and 1000 kg of water from 25 C to 75 C?

Learning Check. How much heat, q, is required to raise the temperature of 1000 kg of iron and 1000 kg of water from 25 C to 75 C? Learning Check q = c * m * ΔT How much heat, q, is required to raise the temperature of 1000 kg of iron and 1000 kg of water from 25 C to 75 C? (c water =4.184 J/ C g, c iron =0.450 J/ C g) q Fe = 0.450

More information

Topic 05 Energetics : Heat Change. IB Chemistry T05D01

Topic 05 Energetics : Heat Change. IB Chemistry T05D01 Topic 05 Energetics 5.1-5.2: Heat Change IB Chemistry T05D01 5.1 Exothermic and endothermic reactions - 1 hour 5.1.1 Define the terms exothermic reaction, endothermic reaction and standard enthalpy change

More information

AP* Chemistry THERMOCHEMISTRY

AP* Chemistry THERMOCHEMISTRY AP* Chemistry THERMOCHEMISTRY Terms for you to learn that will make this unit understandable: Energy (E) the ability to do work or produce heat ; the sum of all potential and kinetic energy in a system

More information

THE ENERGY OF THE UNIVERSE IS CONSTANT.

THE ENERGY OF THE UNIVERSE IS CONSTANT. Chapter 6 Thermochemistry.notebook Chapter 6: Thermochemistry Jan 29 1:37 PM 6.1 The Nature of Energy Thermodynamics: The study of energy and its interconversions Energy: the capacity to do work or to

More information

Gilbert Kirss Foster. Chapter 9. Thermochemistry. Energy Changes in Chemical Reactions

Gilbert Kirss Foster. Chapter 9. Thermochemistry. Energy Changes in Chemical Reactions Gilbert Kirss Foster Chapter 9 Thermochemistry Energy Changes in Chemical Reactions Chapter Outline 9.1 Energy as a Reactant or Product 9.2 Transferring Heat and Doing Work 9.3 Enthalpy and Enthalpy Changes

More information

Energy, Heat and Chemical Change

Energy, Heat and Chemical Change Energy, Heat and Chemical Change Chemistry 35 Fall 2000 Thermochemistry A part of Thermodynamics dealing with energy changes associated with physical and chemical reactions Why do we care? -will a reaction

More information

Thermodynamics. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Thermodynamics. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Thermodynamics Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Thermodynamics is the scientific study of the interconversion of heat and other kinds of energy.

More information

Thermochemistry is the study of the relationships between chemical reactions and energy changes involving heat.

Thermochemistry is the study of the relationships between chemical reactions and energy changes involving heat. CHEM134- F18 Dr. Al- Qaisi Chapter 06: Thermodynamics Thermochemistry is the study of the relationships between chemical reactions and energy changes involving heat. Energy is anything that has the capacity

More information

Thermochemistry Chapter 4

Thermochemistry Chapter 4 Thermochemistry Chapter 4 Thermochemistry is the study of energy changes that occur during chemical reactions Focus is on heat and matter transfer between the system and the surroundings Energy The ability

More information

Calculate the energy required to melt a 2.9 kg block of ice. Melting is a phase change - there is no change in temperature

Calculate the energy required to melt a 2.9 kg block of ice. Melting is a phase change - there is no change in temperature Calculation of Heat During a Phase Change or Reaction During a phase change, a physical process or chemical reaction, the temperature of the system does not change. Therefore the formula q = mc T would

More information

Thermochemistry. Energy (and Thermochemistry) World of Chemistry Chapter 10. Energy. Energy

Thermochemistry. Energy (and Thermochemistry) World of Chemistry Chapter 10. Energy. Energy Thermochemistry Thermodynamics is the science of the relationship between heat and other forms of energy. (and Thermochemistry) World of Chemistry Chapter 10 is defined as the ability to do work or produce

More information

Chemistry Slide 1 of 33

Chemistry Slide 1 of 33 Chemistry 17.2 1 of 33 17.2 Measuring and Expressing Enthalpy Changes A burning match releases heat to its surroundings in all directions. How much heat does this exothermic reaction release? You will

More information

I. Chemical Reactions that Involve Heat

I. Chemical Reactions that Involve Heat Unit 12 Energy I. Chemical Reactions that Involve Heat Thermochemistry: study of changes in heat in chemical reactions. Endothermic: absorbs heat; temp. goes down Exothermic: releases heat; temp. goes

More information

Chapter 6 Thermochemistry 許富銀

Chapter 6 Thermochemistry 許富銀 Chapter 6 Thermochemistry 許富銀 6.1 Chemical Hand Warmers Thermochemistry: the study of the relationships between chemistry and energy Hand warmers use the oxidation of iron as the exothermic reaction: Nature

More information

Chapter 17: Energy and Kinetics

Chapter 17: Energy and Kinetics Pages 510-547 S K K Chapter 17: Energy and Kinetics Thermochemistry: Causes of change in systems Kinetics: Rate of reaction progress (speed) Heat, Energy, and Temperature changes S J J Heat vs Temperature

More information

Thermochemistry (chapter 5)

Thermochemistry (chapter 5) Thermochemistry (chapter 5) Basic Definitions: Thermochemistry = the study of the energy changes that accompany physical and chemical changes of matter. Energy is defined as the ability to do work or the

More information

Name: Date: Period: #: UNIT 4 NOTES & EXAMPLE PROBLEMS. W = kg m s 2 m= kg m2. Pressure =

Name: Date: Period: #: UNIT 4 NOTES & EXAMPLE PROBLEMS. W = kg m s 2 m= kg m2. Pressure = BACKGROUND ON UNITS Acceleration = velocity time Force (F) = mass acceleration = m a F = kg m s 2 = kg m s 2 UNIT 4 NOTES & EXAMPLE PROBLEMS = m s s Work (W)= Force distance = F d = m s 2 = m s-2 W = kg

More information

CHEMISTRY. Chapter 5 Thermochemistry

CHEMISTRY. Chapter 5 Thermochemistry CHEMISTRY The Central Science 8 th Edition Chapter 5 Thermochemistry Dr. Kozet YAPSAKLI The Nature of Energy Kinetic and Potential Energy Potential energy can be converted into kinetic energy. E p = mgh

More information

Chapter 6. Thermochemistry

Chapter 6. Thermochemistry Chapter 6 Thermochemistry Section 5.6 The Kinetic Molecular Theory of Gases http://www.scuc.txed.net/webpages/dmackey/files /chap06notes.pdf ..\..\..\..\..\..\Videos\AP Videos\Thermochemistry\AP

More information

AP* Chemistry THERMOCHEMISTRY

AP* Chemistry THERMOCHEMISTRY AP* Chemistry THERMOCHEMISTRY Let s begin with terms for you to master: Heat (q) Two systems with different temperatures that are in thermal contact will exchange thermal energy, the quantity of which

More information

Chapter 3. Thermochemistry: Energy Flow and Chemical Change. 5.1 Forms of Energy and Their Interconversion

Chapter 3. Thermochemistry: Energy Flow and Chemical Change. 5.1 Forms of Energy and Their Interconversion Chapter 3 Thermochemistry: Energy Flow and Chemical Change 5.1 Forms of Energy and Their Interconversion 5.2 Enthalpy: Chemical Change at Constant Pressure 5.3 Calorimetry: Measuring the Heat of a Chemical

More information

Name Date Class THERMOCHEMISTRY

Name Date Class THERMOCHEMISTRY Name Date Class 17 THERMOCHEMISTRY SECTION 17.1 THE FLOW OF ENERGY HEAT AND WORK (pages 505 510) This section explains the relationship between energy and heat, and distinguishes between heat capacity

More information

Chapter 8 Thermochemistry

Chapter 8 Thermochemistry William L Masterton Cecile N. Hurley http://academic.cengage.com/chemistry/masterton Chapter 8 Thermochemistry Edward J. Neth University of Connecticut Outline 1. Principles of heat flow 2. Measurement

More information

= (25.0 g)(0.137 J/g C)[61.2 C - (-31.4 C)] = 317 J (= kj)

= (25.0 g)(0.137 J/g C)[61.2 C - (-31.4 C)] = 317 J (= kj) CHEM 101A ARMSTRONG SOLUTIONS TO TOPIC D PROBLEMS 1) For all problems involving energy, you may give your answer in either joules or kilojoules, unless the problem specifies a unit. (In general, though,

More information

AP CHEMISTRY NOTES 4-1 THERMOCHEMISTRY: ENTHALPY AND ENTROPY

AP CHEMISTRY NOTES 4-1 THERMOCHEMISTRY: ENTHALPY AND ENTROPY AP CHEMISTRY NOTES 4-1 THERMOCHEMISTRY: ENTHALPY AND ENTROPY Reaction Rate how fast a chemical reaction occurs Collision Theory In order for a chemical reaction to occur, the following conditions must

More information

AP CHEMISTRY. Unit 5 Thermochemistry. Jeff Venables Northwestern High School

AP CHEMISTRY. Unit 5 Thermochemistry. Jeff Venables Northwestern High School AP CHEMISTRY Unit 5 Thermochemistry Jeff Venables Northwestern High School Kinetic Energy and Potential Energy Kinetic energy - the energy of motion: Ek = 1 mv 2 Potential energy - the energy an object

More information

THERMOCHEMISTRY & DEFINITIONS

THERMOCHEMISTRY & DEFINITIONS THERMOCHEMISTRY & DEFINITIONS Thermochemistry is the study of the study of relationships between chemistry and energy. All chemical changes and many physical changes involve exchange of energy with the

More information

Chapter 6: Thermochemistry

Chapter 6: Thermochemistry Chapter 6: Thermochemistry Section 6.1: Introduction to Thermochemistry Thermochemistry refers to the study of heat flow or heat energy in a chemical reaction. In a study of Thermochemistry the chemical

More information

Heat. Heat Terminology 04/12/2017. System Definitions. System Definitions

Heat. Heat Terminology 04/12/2017. System Definitions. System Definitions System Definitions Heat Physical Science 20 Ms. Hayduk Heat Terminology System: the part of the universe being studied (big Earth, or small one atom) Surroundings: the part of the universe outside the

More information

Thermochemistry HW. PSI Chemistry

Thermochemistry HW. PSI Chemistry Thermochemistry HW PSI Chemistry Name Energy 1) Objects can possess energy as: (a) endothermic energy (b) potential energy A) a only B) b only C) c only D) a and c E) b and c (c) kinetic energy 2) The

More information

Introduction to Thermochemistry. Thermochemistry Unit. Definition. Terminology. Terminology. Terminology 07/04/2016. Chemistry 30

Introduction to Thermochemistry. Thermochemistry Unit. Definition. Terminology. Terminology. Terminology 07/04/2016. Chemistry 30 Thermochemistry Unit Introduction to Thermochemistry Chemistry 30 Definition Thermochemistry is the branch of chemistry concerned with the heat produced and used in chemical reactions. Most of thermochemistry

More information

Thermochemistry. Chapter 6. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Thermochemistry. Chapter 6. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Thermochemistry Chapter 6 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Energy is the capacity to do work. Radiant energy comes from the sun and is earth s

More information

Chapter 6 Energy and Chemical Change. Brady and Senese 5th Edition

Chapter 6 Energy and Chemical Change. Brady and Senese 5th Edition Chapter 6 Energy and Chemical Change Brady and Senese 5th Edition Index 6.1 An object has energy if it is capable of doing work 6.2 Internal energy is the total energy of an object s molecules 6.3 Heat

More information

Unit 7 Kinetics and Thermodynamics

Unit 7 Kinetics and Thermodynamics 17.1 The Flow of Energy Heat and Work Unit 7 Kinetics and Thermodynamics I. Energy Transformations A. Temperature 1. A measure of the average kinetic energy of the particles in a sample of matter B. Heat

More information

Chapter 5 Principles of Chemical Reactivity: Energy and Chemical Reactions

Chapter 5 Principles of Chemical Reactivity: Energy and Chemical Reactions Chapter 5 Principles of Chemical Reactivity: Energy and Chemical Reactions Jeffrey Mack California State University, Sacramento Energy & Chemistry Questions that need to be addressed: How do we measure

More information

Saturday Study Session 1 3 rd Class Student Handout Thermochemistry

Saturday Study Session 1 3 rd Class Student Handout Thermochemistry Saturday Study Session 1 3 rd Class Student Handout Thermochemistry Multiple Choice Identify the choice that best completes the statement or answers the question. 1. C 2 H 4 (g) + 3 O 2 (g) 2 CO 2 (g)

More information