Chemical Reactions: The Law of Conservation of Mass
|
|
- Evangeline McLaughlin
- 5 years ago
- Views:
Transcription
1 Chemical Reactions: The Law of Conservation of Mass
2 What happens in a Chemical Reaction? Chemical bonds in the reactants are broken, then atoms are rearranged to form new substances (products). Reactants --- Product The amount of matter does not change during a chemical reaction, the atoms are only rearranged to form new substances.
3 What is a Chemical Equation? A chemical equation is a way that scientists represent a chemical reaction that has occurred. It shows the rearrangement of atoms in a chemical reaction. It contains the chemical formulas of the substances involved in the reaction. An arrow is used to distinguish between the reactants and products, and can be understood as meaning yields or makes. Reactants are the substances broken apart or combined in a chemical reaction (what you start with!) and they are located on the left side of the arrow in a chemical equation. Products are new substances formed in a chemical reaction (what you end with!) and they are located on the right side of the arrow in a chemical equation. Ex: C + O 2 CO 2 This equation says carbon reacts with oxygen to yield (make) carbon dioxide. The arrow shows the direction of the reaction: reactants products.
4 What is the Law of Conservation of Mass? When substances react with each other, many changes can take place, but in every case the total amount of matter afterward is the same as before. Discovered by French Chemist Antoine Laurent Lavoisier Law of Conservation of Mass: in a chemical rxn, mass (atoms) is neither created nor destroyed Mass of reactants = mass of products There must be the same number of atoms in the products and reactants.
5 Mass Stays the SAME The mass of the products must be the same as the mass of the reactants. You do not magically gain or lose mass!!! Example: If you have 2 grams of Na react with 1 gram of Cl to make NaCl, you know you must have 3 grams of NaCl in the products! Na + Cl NaCl 2g + 1g 3g
6 Number of Atoms Stays the SAME You must have the SAME number of atoms of EACH element on both sides of the equation. If you have 2 atoms of oxygen in the reactants, you must have 2 atoms of oxygen in the products. (You do not magically gain or lose atoms!) This is NOT something someone made up; it s how chemical reactions happen in nature!
7 Steps to Balancing Equations There are four basic steps to balancing a chemical equation. 1.Write the correct formula for the reactants and the products. DO NOT TRY TO BALANCE IT YET! You must write the correct formulas first. **And most importantly, once you write them correctly DO NOT CHANGE THE FORMULAS! 2. Find the number of atoms for each element on the left side. Compare those against the number of the atoms of the same element on the right side. 3. When balancing a chemical reaction you may add coefficients in front of the compounds to balance the reaction, but you may NOT change the subscripts. 4. Determine where to place coefficients in front of formulas so that the left side has the same number of atoms as the right side for EACH element in order to balance the equation. 5. Check your answer to see if: The numbers of atoms on both sides of the equation are now balanced. The coefficients are in the lowest possible whole number ratios. (reduced)
8 Subscripts vs. Coefficients The subscripts tell you how many atoms of a particular element are in a compound. The coefficient tells you about the quantity, or number of molecules of the compound.
9 How can I tell how many atoms of each element there are? Coefficient: the big number written in front of a chemical formula that tells you how many molecules of that substance there are. Ex: 5 H 2 O = 5 molecules of water 1 molecule of water H 2 O
10 How can I tell how many atoms of each element there are? The subscript tells you how many atoms of each element there are. The coefficient times the subscript tells you how many total atoms of that element are present. 5 H 2 O = 10 atoms of Hydrogen, 5 atoms of Oxygen 5 (H 2 O ) = (5 x 2 = 10 atoms of Hydrogen) 5 (H 2 O ) = (5 x 1 = 5 atoms of Oxygen) If there is no coefficient, then there is only one molecule of that substance!
11 What does it mean to Balance a Chemical Equation? Sometimes we have to balance a chemical equation to make sure that we have the same number of atoms of each element on both sides of the equation. To do this, we change the number of molecules by changing the coefficients (NEVER THE SUBSCRIPTS!) until we have the same number of atoms of each element on both sides. When we do this, we are saying how many molecules of each substance must be present before the reaction will take place (remember: this is not something scientists made up; this is how the reactions happen in nature!).
12 How do I know if an Equation is Balanced? 1. Check the number of atoms of each element on both sides of the equation (reactants and products). 2. If the number of atoms of each element is the SAME on both sides, then the equation is balanced. Example: H 2 + O 2 H 2 O Element Inventory Chart Reactants Elements Products 2 H 2 2 O 1 H 2 + O 2 H 2 O : Not Balanced Why?
13 How do I know if an Equation is Balanced? 1. Check the number of atoms of each element on both sides of the equation (reactants and products). 2. If the number of atoms of each element is the SAME on both sides, then the equation is balanced. Example: H 2 + O 2 H 2 O Element Inventory Chart Reactants Elements Products 2 H 2 2 O 1 ( 2) = 2 H 2 + O 2 2H 2 O
14 How do I know if an Equation is Balanced? 1. Check the number of atoms of each element on both sides of the equation (reactants and products). 2. If the number of atoms of each element is the SAME on both sides, then the equation is balanced. Example: Element Inventory Chart H 2 + O 2 2H 2 O Reactants Elements Products 2 H 2 ( 2) = 4 2 O 1 ( 2) = 2 H 2 + O 2 2H 2 O : Not balanced, Why?
15 How do I know if an Equation is Balanced? 1. Check the number of atoms of each element on both sides of the equation (reactants and products). 2. If the number of atoms of each element is the SAME on both sides, then the equation is balanced. Example: Element Inventory Chart 2H 2 + O 2 2H 2 O Reactants Elements Products 2 ( 2) = 4 H 2 ( 2) = 4 2 O 2 ( 1) = 2 2H 2 + O 2 2H 2 O : balanced, Why?
Careful observations led to the discovery of the conservation of mass.
Chapter 7, Section 2 Key Concept: The masses of reactants and products are equal. BEFORE, you learned Chemical reactions turn reactants into products by rearranging atoms Chemical reactions can be observed
More informationThe Question (Learning Goals)
The Question (Learning Goals) What is the Law of Conservation of Mass (or atoms)? What is a balanced Chemical Reaction? How do we balance a chemical reaction?? (A Level) Review: Chemical Reactions Chemical
More informationSection 1 Chemical Changes
Chemical Reactions Chemical Reactions Section1 Chemical Reactions slides 3-20 Section 2 Chemical Equations slides 21-34 Section 3 Classifying Chemical Reactions slides 35-46 Sections 4 Chemical Reactions
More informationChemical Formulas and Equations
Part I: The Big Picture Chemical Formulas and Equations Reminder: H is the element symbol for Hydrogen. H 2 is the chemical formula for hydrogen. The subscript 2 after the H means that two atoms of hydrogen
More information10.1 Chemical Equations
Section 10.1 Equations 10.1 Equations Developing the language of chemistry reactions and change Think of the element symbols as the alphabet of chemistry and the formulas as the words of chemistry. s are
More informationBalancing Equations. Chemical reactions occur when bonds (between the electrons of atoms) are formed or broken Chemical reactions involve
Balancing Equations Chemical reactions occur when bonds (between the electrons of atoms) are formed or broken Chemical reactions involve changes in the chemical composition of matter the making of new
More informationChemical Formulas and Equations
Chemical Formulas and Equations 8.5D recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing substances; 8.5F
More informationBalancing Equations. Reactants: Zn + I 2 Product: Zn I 2
Balancing Equations 1 Reactants: Zn + I 2 Product: Zn I 2 2 Chemical Equations Their Job: Depict the kind of reactants and products and their relative amounts in a reaction. 4 Al (s) + 3 O 2 (g) ---> 2
More informationUNIT 2 Atomic Structure
UNIT 2 Atomic Structure Section 1: History & Development of Atomic Theory (Chapter 3) History of the Atom Video The Greeks Democritus World made of empty space and tiny particles ( atoms ) Thought there
More informationChapter 7 Chemical Reactions
Chapter 7 Chemical Reactions Chemical Equation --> is a representation of a chemical reaction in which the reactants and products are expressed as formulas Reactants --> substances that undergo change
More informationThe masses of reactants and products are equal.
Page 1 of 7 KEY CNCEPT The masses of reactants and products are equal. BEFRE, you learned Chemical reactions turn reactants into products by rearranging atoms Chemical reactions can be observed and identified
More informationCHEMICAL REACTIONS. Discuss breaking/forming bonds 10/29/2012. Products Reactants
CHEMICAL REACTIONS - Page 321 Products Reactants Reactants: Zn + I 2 Product: Zn I 2 Discuss breaking/forming bonds Chemical Reaction or Change process in which one or more substances are converted into
More informationSection 1 Chemical Changes
Chemical Reactions Section 1 Chemical Changes What You ll Learn: How to identify the reactants & products in a chemical reaction How a chemical reaction follows the law of conservation of mass How chemists
More informationChemical Reactions. Section 7.1: Nature of Reactions
Chemical Reactions Section 7.1: Nature of Reactions When do chemical reactions take place? What is the role of energy in chemical reactions? 1 Chemical Reactions It is a change in matter that produces
More information7.1 Describing Reactions
Chapter 7 Chemical Reactions 7.1 Describing Reactions Chemical Equations Equation states what a reaction starts with, and what it ends with. Reactants the starting materials that undergo change. (On the
More informationConservation The Law of Conservation of Matter states that matter cannot be created or destroyed in ordinary chemical reactions. This means that no
Chemical Reactions Conservation The Law of Conservation of Matter states that matter cannot be created or destroyed in ordinary chemical reactions. This means that no atoms can be lost or gained. This
More informationPicture This. Reading Essentials 337. Before burning. After burning
chapter 19 Chemical Reactions section 1 Chemical Changes What You ll Learn how to identify the reactants and products in a chemical reaction how a chemical reaction follows the law of conservation of mass
More information( ) Natural Sciences Department. Chemical Reactions
Chemical Reactions Why do atoms cluster? The attraction which keeps atoms united one to each other to form a molecule is called chemical bond. The atoms place themselves in the molecule so that the energy
More informationELEMENTS, COMPOUNDS AND MIXTURES AND HOW THEY ARE REPRESENTED. Jan 12-13, 2014
ELEMENTS, COMPOUNDS AND MIXTURES AND HOW THEY ARE REPRESENTED Jan 12-13, 2014 WHAT ARE ELEMENTS? Elements are pure substances Made of only one kind of material Has definite properties, and Is the same
More informationScience. Reactions and compounds. Chemical reactions
Science Chemical reactions When elements react, their atoms join with other atoms to form compounds [compound: A compound is a substance formed by the chemical union (involving bond formation) of two or
More information1 Chemistry Notes Dr. Reeves Science Class (This was me when I had hair.)
1 Chemistry Notes Dr. Reeves Science Class (This was me when I had hair.) Table of Contents Introduction Slide 5 Topics of Discussion Slide 6 Periodic Table Slide 10 Elements Slide 15 Chemical Formulas
More informationElements and Compounds
Elements and Compounds Essential Questions: 1. How are atoms arranged in the 3 states of matter? 2. What is an element? 3. What is the difference between elements and compounds? 4. What are valence electrons?
More informationChemical Bonds & Reactions
Chemical Bonds & Reactions Chemical Bond A force of attraction that holds two atoms together Has a significant effect on chemical and physical properties of compounds involves the valence electrons Valence
More informationDescribing Chemical Reactions
Describing Chemical Reactions This section explains how to show chemical reactions with symbols. It also states the principle of conservation of mass, and identifies three categories of chemical reactions.
More informationO) and carbon dioxide gas (CO 2
Have you ever tried to balance a book on the top of your head while walking across a room? How do you compensate if you begin to feel the books sliding to one side? You might lean in the opposite direction
More information8.1 Chemical Properties and Changes. chemical property chemical change dissolving
8.1 Chemical Properties and Changes chemical property chemical change dissolving Ability to Change 8.1 Chemical Properties and Changes In a chemical change, the properties that give a substance its identity
More informationWelcome! 11/13&14 TOC. 24 Baggie Lab 11/13&14 25 Conservation of Mass & 11/13&14 Balancing Equations 26 Rube-Goldberg Design 11/9
Welcome! 11/13&14 TOC 24 Baggie Lab 11/13&14 25 Conservation of Mass & 11/13&14 Balancing Equations 26 Rube-Goldberg Design 11/9 Trial #1 Pre-Reaction Mass (g) Post-reaction mass (g) 1 49 46.5 2 47 44
More informationIntroduction to Chemical Equations. Introduction to Chemical Equations. How do you write a skeleton equation?
Introduction to Chemical Equations Introduction to Chemical Equations How do you write a skeleton equation? Introduction to Chemical Equations All chemical reactions involve changing substances. In a chemical
More information2 Chemical Formulas and Equations
CHAPTER 2 2 Chemical Formulas and Equations SECTIN Chemical Reactions BEFRE YU READ After you read this section, you should be able to answer these questions: What are chemical formulas? What are chemical
More informationScience 1206 Chemistry Unit #10
Science 1206 Chemistry Unit #10 Introduction to Chemical Equations Communicating Chemical Changes Chemical change occurs when matter changes into a new and different form. The new form has a new make up
More informationMolar Mass. The total of the atomic masses of all the atoms in a molecule:
Molar Mass The total of the atomic masses of all the atoms in a molecule: Ex: H 2 O H (1.0079) x 2 atoms = 2.0158 grams O (15.999) x 1 atom = 15.999 grams 18.0148 grams (18.0 grams) Ex: Cu(NO 3 ) 2 Cu
More informationUnit 5: Chemical Reactions. Chapter 11
Unit 5: Chemical Reactions Chapter 11 Objectives 35 Identify the five types of chemical reactions 36 Write word and chemical equations based on chemical reactions 37 Balance chemical equations 38 Predict
More informationConservation of Mass
Conservation of Mass 1 of 35 Boardworks Ltd 2016 Conservation of Mass 2 of 35 Boardworks Ltd 2016 What is a chemical reaction? 3 of 35 Boardworks Ltd 2016 A chemical reaction is a change that takes place
More informationChapter 3. Mass Relationships in Chemical Reactions
Chapter 3 Mass Relationships in Chemical Reactions In this chapter, Chemical structure and formulas in studying the mass relationships of atoms and molecules. To explain the composition of compounds and
More informationKWL CHART--REACTIONS
1 KWL CHART--REACTIONS What do I already know about chemical reactions? What do I want to know about chemical reactions? What have I learned today about chemical reactions? 2 Intro video: types of reactions
More informationModeling Conservation of Mass
How is mass conserved (protected from loss)? Imagine an evening campfire. As the wood burns, you notice that the logs have become a small pile of ashes. What happened? Was the wood destroyed by the fire?
More information7.1 Describing Reactions. Burning is a chemical change. When a substance undergoes a chemical change, a chemical reaction is said to take place.
Burning is a chemical change. When a substance undergoes a chemical change, a chemical reaction is said to take place. Chemical Equations What is the law of conservation of mass? The law of conservation
More informationDescribing Chemical Reactions
Name Date Class Chemical Reactions Guided Reading and Study Describing Chemical Reactions This section explains how to show chemical reactions with symbols. It also states the principle of conservation
More information2 Chemical Formulas and Equations
CHAPTER 9 2 Chemical Formulas and Equations SECTIN Chemical Reactions 8.3.f, 8.5.b California Science Standards BEFRE YU READ After you read this section, you should be able to answer these questions:
More informationCHAPTER 3: MATTER. Active Learning Questions: 1-6, 9, 13-14; End-of-Chapter Questions: 1-18, 20, 24-32, 38-42, 44, 49-52, 55-56, 61-64
CHAPTER 3: MATTER Active Learning Questions: 1-6, 9, 13-14; End-of-Chapter Questions: 1-18, 20, 24-32, 38-42, 44, 49-52, 55-56, 61-64 3.1 MATTER Matter: Anything that has mass and occupies volume We study
More informationAtomic Structure. The center of the Atom is called the Nucleus
Basic Chemistry Review Atomic Structure The center of the Atom is called the Nucleus It is about 100,000 times smaller than the entire atom It makes up 99.9% of the mass of the atom In the Nucleus There
More informationScience 1206 Ch. 3 - Chemical names, formulas and equations
Science 1206 Ch. 3 - Chemical names, formulas and equations 3.1 - Ionic and molecular compounds (pp. 98-107) Compounds A compound is a pure substance made of a combination of elements. The elements are
More informationMole Ratios. How can the coefficients in a chemical equation be interpreted? (g) 2NH 3. (g) + 3H 2
Why? Mole Ratios How can the coefficients in a chemical equation be interpreted? A balanced chemical equation can tell us the number of reactant and product particles (ions, atoms, molecules or formula
More informationActivity Sheet Chapter 6, Lesson 1 What is a Chemical Reaction?
Activity Sheet Chapter 6, Lesson 1 What is a Chemical Reaction? Name Date DEMNSTRATIN 1. Your teacher lit a candle and told you that this was a chemical reaction. What are the reactants in this chemical
More information1. What is a dot diagram? 2. Drawing dot diagrams. Name:
Name: Skill Sheet 29.2 Dot Diagrams You have learned that atoms are composed of protons, neutrons, electrons. The electrons occupy energy levels that surround the nucleus in the form of an electron cloud.
More informationIonic Covalent Metallic
3 Types of Chemical Bonds Ionic Covalent Metallic What can you describe about each of these bonds just by looking at the name? Chemical Bonds & Reactions Chemical Bond A force of attraction that holds
More informationVOCABULARY Define. 1. stoichiometry. 2. composition stoichiometry. 3. reaction stoichiometry. 4. unknown. 5. mole ratio
CHAPTER 9 HOMEWORK 9-1 (pp. 275 279) Define. 1. stoichiometry 2. composition stoichiometry 3. reaction stoichiometry 4. unknown 5. mole ratio SKILL BUILDER On a separate sheet of paper, write five possible
More informationLaw of Conservation of Mass
.8: hemical Equations onding and hemical Reactions Law of onservation of Mass 1 2 hemical reactions are occurring both inside of us and all around us every second of every day. s a matter of fact, there
More informationChapter 1 Section 1- Pages 4-7: Electrons and Chemical Bonding COMBINING ATOMS THROUGH CHEMICAL BONDING
Study Guide Chapter 1 and 2 Interactions of Matter Chapter 1 Section 1- Pages 4-7: Electrons and Chemical Bonding COMBINING ATOMS THROUGH CHEMICAL BONDING 1. Which of these substances is a combination
More informationChemical Bonds & Reactions
Chemical Bonds & Reactions Chemical Bond A force of attraction that holds two atoms together Involves the valence electrons (they determine the chemical characteristics of the atom!) Valence Electrons
More informationChemical Changes. Lavoisier and the Conservation of Mass
1 Chemical Changes Lavoisier and the Conservation of Mass Chemical reactions are taking place all around you and even within you. A chemical reaction is a change in which one or more substances are converted
More informationGeneral Chemistry. Chapter 3. Mass Relationships in Chemical Reactions CHEM 101 (3+1+0) Dr. Mohamed El-Newehy 10/12/2017
General Chemistry CHEM 101 (3+1+0) Dr. Mohamed El-Newehy http://fac.ksu.edu.sa/melnewehy Chapter 3 Mass Relationships in Chemical Reactions 1 In this chapter, Chemical structure and formulas in studying
More informationIntroduction to Chemical Reactions. Making new substances
Introduction to Chemical Reactions Making new substances Main Ideas Chemical Reactions are represented by Chemical Equations. Chemical Equations are balanced to show the same number of atoms of each element
More informationAtoms, Molecules, and the Mole
The Mole Now that we know how to write and name chemical compounds, we need to understand how chemists use these formulas quantitatively. As chemists, we need to know how many atoms or molecules are reacting
More informationBalancing Chemical Equations notes for p. 8-10
Balancing Chemical Equations notes for p. 8-10 Balanced Equation Atoms can t be created or destroyed Law of Conservation of Mass All the atoms we start with we must end up with A balanced equation has
More information1 Forming New Substances
CHAPTER 9 1 Forming New Substances SECTION Chemical Reactions BEFORE YOU READ After you read this section, you should be able to answer these questions: What is a What are exothermic reactions? What are
More informationChapter 3. Stoichiometry:
Chapter 3. Stoichiometry: Watch Bozeman Videos & other videos on my website for additional help: Big Idea 1: Chemical Analysis Conservation of Atoms Balancing Equations Symbolic Representation Mole Big
More informationTHE LAWS LAB LAW OF CONSERVATION OF MASS, LAW OF DEFINITE PROPORTIONS, LAW OF MULTIPLE PROPORTIONS
THE LAWS LAB LAW OF CONSERVATION OF MASS, LAW OF DEFINITE PROPORTIONS, LAW OF MULTIPLE PROPORTIONS PRELAB Please answer the following questions on a separate piece of paper using complete sentences. 1.
More informationChemical Bonds & Reactions
Chemical Bonds & Reactions Chemical Bonding Do you understand how it works? What do you think when I pull out a bag of candy? I want that candy cause I don t have any! Does everyone think the same thing?
More informationbalancing equations notes website 2018.notebook November 12, 2018
1 Particle model and Balancing Equations Used to show chemical reactions have occured. Matter is made up of atoms and molecules and is subject to change. Counting atoms in a molecule NaCl 3 NaCl Na 2 SO
More informationChapter 3. Stoichiometry: Calculations with Chemical Formulas and Equations
Chapter 3. Stoichiometry: Calculations with Chemical Formulas and Equations Lecture Outline 3.1 Chemical Equations The quantitative nature of chemical formulas and reactions is called stoichiometry. Lavoisier
More informationMolecules, Compounds, and Crystals
Matter: Properties and Change Atoms and Elements 1. Matter is anything that has mass and volume. All substances are made up of different types of matter. 2. Mass is the amount of matter in a substance.
More informationChapter 9 Practice Test
Chapter 9 Practice Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1) Which of the following describes a chemical reaction? a) A gas is given off when
More informationUnit 5: Diversity of Matter
21 21 Table of Contents Unit 5: Diversity of Matter Chapter 21: Chemical Reactions 21.1: Chemical Changes 21.2: Chemical Equations 21.3: Classifying Chemical Reactions 21.4: Chemical Reactions and Energy
More information2 Chemical Formulas and Equations
CHAPTER 14 2 Chemical Formulas and Equations SECTIN Chemical Reactions BEFRE YU READ After you read this section, you should be able to answer these questions: What are chemical formulas? What are chemical
More informationE20: BALANCING EQUATIONS
E20: BALANCING EQUATIONS Before we can talk about balancing equations, we need to know how to READ an equation. We've already talked about symbols (like H or Na), and you should know how to read a formula
More informationAP Chemistry Chapter 3. Stoichiometry
AP Chemistry Chapter 3 Stoichiometry Stoichiometry Is the study of the quantities of substances consumed and produced in chemical reactions Derived from the Greek words stoicheion meaning element and metron
More informationCHEMISTRY NOTES. Elements and the periodic table. name of the element. A. Element 1. Definition a substance made of one kind of atom
CHEMISTRY NOTES Elements and the periodic table A. Element 1. Definition a substance made of one kind of atom a. Atom smallest particle of an element Nucleus Protons = Positive charge Neutrons = No charge
More informationH + O. Warm-Up What is wrong with this Chemical equation? You must use all of the following words and write in complete sentences:
Warm-Up What is wrong with this Chemical equation? H + O H2O You must use all of the following words and write in complete sentences: Law of conservation of matter chemical equation reactant product Warm-Up
More informationStates & Properties of Matter. Unit 1 Topics 4 & 5
States & Properties of Matter Unit 1 Topics 4 & 5 Pure Substances Topic 4 - Elements and Compounds Elements Pure substances that only contain one kind of atom and cannot be separated into a simpler substance.
More informationStoichiometry World of Chemistry: Chapter 9
Stoichiometry World of Chemistry: Chapter 9 Chocolate Chip Cookies!! 1 cup butter 1/2 cup white sugar 1 cup packed brown sugar 1 teaspoon vanilla extract 2 eggs 2 1/2 cups all-purpose flour 1 teaspoon
More informationMass Relationships in Chemical Reactions
Mass Relationships in Chemical Reactions Chapter 3 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Micro World atoms & molecules Macro World grams Atomic mass
More informationUNIT 5: MOLES & STOICHIOMETRY
*KEY* UNIT 5: MOLES & STOICHIOMETRY *KEY* VOCABULARY: 1. Mole 2. Formula mass (FM) 3. Gram formula mass (GFM) 4. Coefficient 5. Subscript 6. Species 7. Law of conservation of mass 8. Law of conservation
More informationName AP CHEM / / Chapter 3 Outline Stoichiometry
Name AP CHEM / / Chapter 3 Outline Stoichiometry Atomic Masses The modern system of atomic masses, instituted in 1961, is based on carbon-12. Carbon-12 is assigned the mass of exactly 12 atomic mass units
More informationSection 3: Reaction Types
: Reaction Types Preview Key Ideas Bellringer Classifying Reactions Single Displacement Double-Displacement Reaction Electrons and Chemical Reactions Key Ideas How does learning about reaction types help
More informationStoichiometry Dr. M. E. Bridge
Preliminary Chemistry Course Stoichiometry Dr. M. E. Bridge What is stoichiometry? The meaning of the word: The word stoichiometry comes from two Greek words: stoichon(meaning element ) and metron(meaning
More informationFrom Writing Formulas to Balancing Equations A Tutorial
Chemistry Revised 2013 Name From Writing Formulas to Balancing Equations A Tutorial Period Oxidation Numbers. The Oxidation numbers written as s _ tell whether an element or group of elements lost or gained
More informationThe Periodic Table. run vertically on the periodic table (up and down).
Lesson Objective: The Periodic Table Science 8.5B Interpret the arrangement of the Periodic Table, including groups and periods, to explain how properties are used to classify elements 8.2E Analyze data
More informationCHAPTER 1: CHEMICAL REACTIONS
CHAPTER 1: CHEMICAL REACTIONS Section 1: Forming New Substances Chemical Changes are responsible for leaf coloring Chemical Reactions Process of one or more substance undergoes change to produce one or
More informationCHEMICAL COMPOSITION AND REACTIONS Chapter 8
CHEMICAL COMPOSITION AND REACTIONS Chapter 8 OUTLINE Oxidation Numbers and Formulas Nomenclature Writing Equations Types of Reactions OXIDATION NUMBERS AND THEIR RULES Oxidation numbers represent the number
More informationMass Relationships in Chemical Reactions
Mass Relationships in Chemical Reactions Chapter 3 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Micro World atoms & molecules Macro World grams Atomic mass
More informationHow many molecules are in 0.25 moles of CH 4?
Mass Moles- Particle Particles can be atoms, molecules, ions, etc. In one mole of particles, there are 6.02x10 23 particles These particles are so small and we need so many of them to be on a human scale,
More informationUnit 6. Chemical Reactions
Unit 6 Chemical Reactions Physical Vs. Chemical Change Physical changes= changes in form (phase), but not the identity of the substance ex: H 2 O (s) H 2 O (l) (* Starts as H 2 O and ends as H 2 O) Chemical
More informationUnit 7 Chemical Reactions. Ch. 8 & 19.1
Unit 7 Chemical Reactions Ch. 8 & 19.1 Equations An equation is a description of a chemical reaction indicating the reactants, the products and a ratio of their quantities. REMEMBER: **Reactants Products
More informationELEMENTS, COMPOUNDS AND MIXTURES AND HOW THEY ARE REPRESENTED
ELEMENTS, COMPOUNDS AND MIXTURES AND HOW THEY ARE REPRESENTED 8.5D recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas
More informationELEMENTS, COMPOUNDS AND MIXTURES AND HOW THEY ARE REPRESENTED
ELEMENTS, COMPOUNDS AND MIXTURES AND HOW THEY ARE REPRESENTED 8.5D recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas
More informationChapter 3. Stoichiometry
Chapter 3 Stoichiometry Chapter 3 Chemical Stoichiometry Stoichiometry The study of quantities of materials consumed and produced in chemical reactions. Since atoms are so small, we must use the average
More informationNotes: Balancing Chemical Equations
Notes: Balancing Chemical Equations Effects of chemical reactions: Chemical reactions rearrange atoms in the reactants to form new products. The identities and properties of the products are completely
More informationSection 1: What is a Chemical Reaction
Section 1: What is a Chemical Reaction I can describe and give examples of physical and chemical changes. I can identify reactants and products. I can explain what happens to molecules in chemical reactions
More informationIndicate the answer choice that best completes the statement or answers the question.
Indicate the answer choice that best completes the statement or answers the question. 1. Which of the following bonds is polar? a. F F b. O H c. O O d. H H 2. In the compound, H 2 O, the electrons in the
More informationStoichiometry. Chapter 3
Stoichiometry Chapter 3 Chemical Stoichiometry Stoichiometry: The study of quantities of materials consumed and produced in chemical reactions. In macroworld, we can count objects by weighing assuming
More informationName: Mr. Dolgos Regents Chemistry NOTE PACKET. Unit 5: Moles & Stoichiometry
Name: Mr. Dolgos Regents Chemistry NOTE PACKET Unit 5: Moles & Stoichiometry 1 UNIT 5: MOLES & STOICHIOMETRY VOCABULARY: 1. Mole 2. Formula mass (FM) 3. Gram formula mass (GFM) 4. Coefficient 5. Subscript
More informationChemical Equations. Their Job: Depict the kind of reactants and products and their relative amounts in a reaction.
Chemical Equations Their Job: Depict the kind of reactants and products and their relative amounts in a reaction. Balancing Equations Law of Conservation of Matter: In a chemical reaction, matter can be
More informationNotes: Chemical Reactions (text Ch. 8)
U Name Per. Notes: Chemical Reactions (text Ch. 8) NOTE: This set of class notes is not complete. We will be filling in information in class. If you are absent, it is your responsibility to get missing
More informationPlants Lesson 2, Activity 2: Using Molecular Models to Explain Photosynthesis
Environmental Literacy Project Michigan State University Plants Lesson 2, Activity 2: Using Molecular Models to Explain Photosynthesis Answering the Three Questions for plants in the light The Movement
More informationStudent Exploration: Chemical Changes
Name: Date: Student Exploration: Chemical Changes Vocabulary: acid, base, catalyst, chemical change, coefficient, conservation of matter, decomposition, dissolve, double replacement, endothermic, exothermic,
More informationWhat is a chemical property of matter?
What is a chemical property of matter? A. Chemical properties of matter involve a chemical change. 1. Observations of matter that involve a chemical change cause new matter to be formed. a. Chemical changes
More informationChemical Equations. Physical Science
Chemical Equations Physical Science Chemical Equations A chemical equation is a shorthand way of expressing a chemical reaction. CHEMICAL REACTIONS Reactants: Zn + I 2 Product: Zn I 2 Chemical reactions
More informationCHAPTER 8 CHEMICAL REACTIONS AND EQUATIONS
CHAPTER 8 CHEMICAL REACTIONS AND EQUATIONS CHEMICAL REACTIONS Occurs when matter combines or breaks apart to produce new kinds of matter with different properties with a change in energy. EVIDENCE FOR
More informationThe Chemistry of Respiration and Photosynthesis
The Chemistry of Respiration and Photosynthesis Objective- You should be able to write balanced equations for respiration and photosynthesis and explain how the two equations are related. Directions :
More information