Representing chemical change: State symbols *
|
|
- Esther Conley
- 5 years ago
- Views:
Transcription
1 OpenStax-CNX module: m Representing chemical change: State symbols * Free High School Science Texts Project This work is produced by OpenStax-CNX and licensed under the Creative Commons Attribution License State symbols and other information The state (phase) of the compounds can be expressed in the chemical equation. This is done by placing the correct label on the right hand side of the formula. There are only four labels that can be used: 1. (g) for gaseous compounds 2. (l) for liquids 3. (s) for solid compounds 4. (aq) for an aqueous (water) solution To show that heat is needed for a reaction, a Greek delta ( ) is placed above the arrow. tip: You may remember from Physical and chemical change that energy cannot be created or destroyed during a chemical reaction but it may change form. In an exothermic reaction, H is less than zero and in an endothermic reaction, H is greater than zero. This value is often written at the end of a chemical equation. Exercise 1: Balancing chemical equations 5 (Solution on p. 5.) Solid zinc metal reacts with aqueous hydrochloric acid to form an aqueous solution of zinc chloride (ZnCl 2 )and hydrogen gas. Write a balanced equation for this reaction. Exercise 2: Balancing chemical equations 5 (advanced) (Solution on p. 5.) Balance the following equation: (NH 4 ) 2 SO 4 + NaOH NH 3 + H 2 O + Na 2 SO 4 (1) In this example, the rst two steps are not necessary because the reactants and products have already been given. The following video explains some of the concepts of balancing chemical equations. * Version 1.2: Sep 29, :59 am
2 OpenStax-CNX module: m Khan Academy video on balancing chemical equations This media object is a Flash object. Please view or download it at < Figure Balancing more advanced chemical equations Write balanced equations for each of the following reactions: 1. Al 2 O 3 (s) + H 2 SO 4 (aq) Al 2 (SO 4 ) 3 (aq) + 3H 2 O (l) 2. Mg (OH) 2 (aq) + HNO 3 (aq) Mg (NO 3 ) 2 (aq) + 2H 2 O (l) 3. Lead (II) nitrate solution reacts with potassium iodide solution. 4. When heated, aluminium reacts with solid copper oxide to produce copper metal and aluminium oxide (Al 2 O 3 ). 5. When calcium chloride solution is mixed with silver nitrate solution, a white precipitate (solid) of silver chloride appears. Calcium nitrate (Ca (NO 3 ) 2 ) is also produced in the solution. Click here for the solution 1 Balanced equations are very important in chemistry. It is only by working with the balanced equations that chemists can perform many dierent calculations that tell them what quantity of something reacts. In a later chapter we will learn how to work with some of these calculations. We can interpret balanced chemical equations in terms of the conservation of matter, the conservation of mass or the conservation of energy. This media object is a Flash object. Please view or download it at < phpapp02&stripped_title=reactions > Figure 1 2 Summary A chemical equation uses symbols to describe a chemical reaction. In a chemical equation, reactants are written on the left hand side of the equation and the products on the right. The arrow is used to show the direction of the reaction. When representing chemical change, it is important to be able to write the chemical formula of a compound. In any chemical reaction, the law of conservation of mass applies. This means that the total atomic mass of the reactants must be the same as the total atomic mass of the products. This also means that the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the product. 1
3 OpenStax-CNX module: m If the number of atoms of each element in the reactants is the same as the number of atoms of each element in the product, then the equation is balanced. If the number of atoms of each element in the reactants is not the same as the number of atoms of each element in the product, then the equation is not balanced. In order to balance an equation, coecients can be placed in front of the reactants and products until the number of atoms of each element is the same on both sides of the equation. 2.1 End of chapter exercises 1. Propane is a fuel that is commonly used as a heat source for engines and homes. Balance the following equation for the combustion of propane: C 3 H 8 (l) + O 2 (g) CO 2 (g) + H 2 O (l)click here for the solution 2 2. Aspartame, an articial sweetener, has the formula C 14 H 18 N 2 O 2. Write the balanced equation for its combustion (reaction with O 2 ) to form CO 2 gas, liquid H 2 O, and N 2 gas. Click here for the solution 3 3. F e 2 (SO 4 ) 3 + K (SCN) K 3 Fe (SCN) 6 + K 2 SO 4 Click here for the solution 4 4. Chemical weapons were banned by the Geneva Protocol in According to this protocol, all chemicals that release suocating and poisonous gases are not to be used as weapons. White phosphorus, a very reactive allotrope of phosphorus, was recently used during a military attack. Phosphorus burns vigorously in oxygen. Many people got severe burns and some died as a result. The equation for this spontaneous reaction is: P 4 (s) + O 2 (g) P 2 O 5 (s) a. Balance the chemical equation. b. Prove that the law of conservation of mass is obeyed during this chemical reaction. c. Name the product formed during this reaction. d. Classify the reaction as endothermic or exothermic. Give a reason for your answer. e. Classify the reaction as a synthesis or decomposition reaction. Give a reason for your answer. Click here for the solution 5 (DoE Exemplar Paper ) 5. Mixing bleach (NaOCl) and ammonia (two common household cleaners) is very dangerous. When these two substances are mixed they produce toxic chloaramine (NH 2 Cl) fumes. Balance the following equations that occur when bleach and ammonia are mixed: a. NaOCl (aq) + NH 3 (aq) NaONH 3 (aq) + Cl 2 (g) b. If there is more bleach than ammonia the following may occur: NaOCl + NH 3 NaOH + NCl 3 Nitrogen trichloride (NCl 3 ) is highly explosive. c. If there is more ammonia than bleach the following may occur: NH 3 + NaOCl NaOH + NH 2 Cl These two products then react with ammonia as follows: NH 3 + NH 2 Cl + NaOH N 2 H 4 + NaCl + H 2 O One last reaction occurs to stabilise the hydrazine and chloramine: NH 2 Cl+N 2 H 4 NH 4 Cl+N 2 This reaction is highly exothermic and will explode. Click here for the solution 6 6. Balance the following chemical equation: N 2 O 5 NO 2 + O 2 Click here for the solution 7 7. Sulphur can be produced by the Claus process. This two-step process involves reacting hydrogen sulphide with oxygen and then reacting the sulphur dioxide that is produced with more hydrogen
4 OpenStax-CNX module: m sulphide. The equations for these two reactions are: H 2 S + O 2 SO 2 + H 2 O H 2 S + SO 2 S + H 2 O (2) Balance these two equations. Click here for the solution 8 8
5 OpenStax-CNX module: m Solutions to Exercises in this Module Solution to Exercise (p. 1) Step 1. The reactants are zinc (Zn) and hydrochloric acid (HCl). The products are zinc chloride (ZnCl 2 ) and hydrogen (H 2 ). Step 2. Zn + HCl ZnCl 2 + H 2 (3) Step 3. You will notice that the zinc atoms balance but the chlorine and hydrogen atoms don't. Since there are two chlorine atoms on the right and only one on the left, we will give HCl a coecient of 2 so that there will be two chlorine atoms on each side of the equation. Zn + 2HCl ZnCl 2 + H 2 (4) Step 4. When you look at the equation again, you will see that all the atoms are now balanced. Step 5. In the initial description, you were told that zinc was a metal, hydrochloric acid and zinc chloride were in aqueous solutions and hydrogen was a gas. Zn (s) + 2HCl (aq) ZnCl 2 (aq) + H 2 (g) (5) Solution to Exercise (p. 1) Step 1. With a complex equation, it is always best to start with atoms that appear only once on each side i.e. Na, N and S atoms. Since the S atoms already balance, we will start with Na and N atoms. There are two Na atoms on the right and one on the left. We will add a second Na atom by giving NaOH a coecient of two. There are two N atoms on the left and one on the right. To balance the N atoms, NH 3 will be given a coecient of two. The equation now looks as follows: (NH 4 ) 2 SO 4 + 2NaOH 2NH 3 + H 2 O + Na 2 SO 4 (6) Step 2. N, Na and S atoms balance, but O and H atoms do not. There are six O atoms and ten H atoms on the left, and ve O atoms and eight H atoms on the right. We need to add one O atom and two H atoms on the right to balance the equation. This is done by adding another H 2 O molecule on the right hand side. We now need to check the equation again: (NH 4 ) 2 SO 4 + 2NaOH 2NH 3 + 2H 2 O + Na 2 SO 4 (7) The equation is now balanced.
Representing Chemical Change
Representing Chemical Change As we have already mentioned, a number of changes can occur when elements react with one another. These changes may either be physical or chemical. One way of representing
More informationPhysical and Chemical change: Conservation of matter *
OpenStax-CNX module: m38711 1 Physical and Chemical change: Conservation of matter * Free High School Science Texts Project This work is produced by OpenStax-CNX and licensed under the Creative Commons
More informationChemical Reactions. Chemical changes are occurring around us all the time
Chemical changes are occurring around us all the time Food cooking Fuel being burned in a car s engine Oxygen being used in the human body The starting materials are called reactants The ending materials
More informationUNIT 2. Chemical Reactions. Chapter 4: Developing Chemical Equations. Chapter 5:Classifying. Chemical Reactions. Chapter 6:Acids and Bases
UNIT 2 Chemical Reactions Chapter 4: Developing Chemical Equations Chapter 5:Classifying Chemical Reactions Chapter 6:Acids and Bases CHAPTER 5 Classifying Chemical Reactions In this chapter, you will:
More informationIndicators of chemical reactions
Indicators of chemical reactions Emission of light or heat Formation of a gas Formation of a precipitate Color change Emission of odor All chemical reactions: have two parts Reactants - the substances
More information5072 CHEMISTRY (NEW PAPERS WITH SPA) BASIC TECHNIQUES 5067 CHEMISTRY (NEW PAPERS WITH PRACTICAL EXAM) BASIC TECHNIQUES
5072 CHEMISTRY (NEW PAPERS WITH SPA) BASIC TECHNIQUES 5067 CHEMISTRY (NEW PAPERS WITH PRACTICAL EXAM) BASIC TECHNIQUES LEARNING OUTCOMES a) Be able to write formulae of simple compounds b) Be able to write
More information2. Relative molecular mass, M r - The relative molecular mass of a molecule is the average mass of the one molecule when compared with
Chapter 3: Chemical Formulae and Equations 1. Relative atomic mass, A r - The relative atomic mass of an element is the average mass of one atom of an element when compared with mass of an atom of carbon-12
More informationBalancing Equations Notes
. Unit 9 Chemical Equations and Reactions What is a Chemical Equation? A is a written representation of the process that occurs in a chemical reaction. A chemical equation is written with the (starting
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 informationChapter 1 Chemical Reactions & Equations
CBSE Class 10th NCERT Science Chapter 1 Chemical Reactions & Equations Intext Questions On Page 6 Question 1: Why should a magnesium ribbon be cleaned before burning in air? Magnesium is an extremely reactive
More informationChemical Reactions and Equations
Chemical Reactions and Equations 5-1 5.1 What is a Chemical Reaction? A chemical reaction is a chemical change. A chemical reaction occurs when one or more substances is converted into one or more new
More informationCHEMICAL EQUATIONS WHAT BALANCING AN EQUATION MEANS
17 CHEMICAL EQUATIONS WHAT BALANCING AN EQUATION MEANS WHAT IS A CHEMICAL EQUATION? A chemical equation is a way of representing a chemical reaction in symbolic form. For example, when hydrochloric acid
More informationCHEMICAL REACTIONS. Types of Reactions. Steps to Writing Reactions
Types of Reactions CHEMICAL REACTIONS There are five types of chemical reactions we will talk about: 1. Synthesis reactions 2. reactions 3. Single displacement reactions 4. reactions 5. Combustion reactions
More information(DO NOT WRITE ON THIS TEST)
Final Prep Chap 8&9 (DO NOT WRITE ON THIS TEST) Multiple Choice Identify the choice that best completes the statement or answers the question. 1. After the correct formula for a reactant in an equation
More informationUnit IV: Chemical Equations & Stoichiometry
Unit IV: Chemical Equations & Stoichiometry A. The chemical equation B. Types of chemical reactions A. Activity series of metals B. Solubility rules C. Rules for writing and balancing equations D. Calculations
More informationC2.6 Quantitative Chemistry Foundation
C2.6 Quantitative Chemistry Foundation 1. Relative masses Use the periodic table to find the relative masses of the elements below. (Hint: The top number in each element box) Hydrogen Carbon Nitrogen Oxygen
More informationScience 1206 Unit 3: Chemical Reactions Page 1 of 15
Science 1206 Unit 3: Chemical Reactions Page 1 of 15 Introduction to Chemical Reactions Notes Part II TEXT p. 218-219 (word equations) There are many chemical reactions too many to count in fact! Like
More informationTYPES OF CHEMICAL REACTIONS
TYPES OF CHEMICAL REACTIONS http://www.youtube.com/watch?v=te4668aarck&feature=related The Five Major Class of Chemical Reaction http://www.youtube.com/watch?v=i HHvx1VC_8 Jan 2 8:07 PM 1 Nov 19 8:48 AM
More informationBalancing Equations Notes
. Unit 7 Chemical Equations and Reactions What is a Chemical Equation? A is a written representation of the process that occurs in a chemical reaction. A chemical equation is written with the (starting
More informationScience 1206 Chemistry Unit #11
Science 1206 Chemistry Unit #11 Types of Chemical Reactions Types of Chemical Reactions Five types of chemical reactions: Formation (synthesis) Decomposition Single Displacement Double Displacement Combustion
More informationClass X. Exercises solution
Exercises solution Question 1: Which of the statements about the reaction below are incorrect? Lead is getting reduced. Carbon dioxide is getting oxidised. Carbon is getting oxidised. Lead oxide is getting
More informationIdentify the reaction type, predict the products, and balance the equations. If it is a special decomposition or synthesis, identify which kind.
Identify the reaction type, predict the products, and balance the equations. If it is a special decomposition or synthesis, identify which kind. 1. calcium + oxygen 2. cupric carbonate 3. aluminum + hydrochloric
More informationTypes of Chemical Reactions
Types of Chemical Reactions There are five types of chemical reactions: 1. Formation (combination) 2. Decomposition 3. Single Displacement 4. Double Displacement 5. Combustion 1 Formation (Combination)
More informationChemical Bonds In elements and compounds, the atoms are held together by chemical bonds.
Chemical Bonds In elements and compounds, the atoms are held together by chemical bonds. Forming a bond makes an atom more stable, so atoms form as many bonds are they are able to. Bonds are made using
More informationWebsite: Page 1. Page 14»Exercise» Page 15» Question 1:
Page 14»Exercise» Question 1: Which of the statements about the reaction below are incorrect? (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead
More information9-1 The Nature of Chemical Reactions
9-1 The Nature of Chemical Reactions What are chemical reactions and why do they occur? A chemical reaction is a process in which one or more substances are converted into new substances with different
More informationBalancing Equations Notes
. Unit 6 Chemical Equations and Reactions What is a Chemical Equation? A Chemical Equation is a written representation of the process that occurs in a chemical reaction. A chemical equation is written
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 informationBalancing Equations Notes
. Unit 9 Chemical Equations and Reactions What is a Chemical Equation? A Chemical Equation is a written representation of the process that occurs in a chemical reaction. A chemical equation is written
More informationTOPIC 4: THE MOLE CONCEPTS
TOPIC 4: THE MOLE CONCEPTS INTRODUCTION The mass is gram (g) of 1 mole of substances is called its.. 1 mole of substances has.. particles of a substances The mass of 1 mole of substances is always equal
More informationBalancing CHEMICAL EQUATIONS
Balancing CHEMICAL EQUATIONS CHEMICAL REACTIONS involves a chemical change in the identity of one or more chemical species Ex. Rusting of iron (Fe): chemical rxn btwn water and iron involve the breaking
More informationNCERT Solutions for Atoms and Molecules
1 NCERT Solutions for Atoms and Molecules Question 1. In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium
More informationVOCABULARY Define. 1. reactants. 2. products. 3. chemical equation. 4. precipitate. 5. word equation
CHAPTER 8 HOMEWORK 8-1 (pp. 241 245) Define. 1. reactants 2. products 3. chemical equation 4. precipitate 5. word equation GRAPHIC ORGANIZER Complete the chart by listing three signs that suggest that
More informationChemical Reactions. Ch. 11 Chemical Reactions. Chemical Reactions. Chemical Reactions
Chemical Reactions Ch. 11 Chemical Reactions when a substance changes identity Reactants - original Products - resulting law of conservation of mass total mass of reactants = total mass of products In
More informationName... Requirements for the task and Chemistry lessons
Name... HAUTLIEU SCHOOL CHEMISTRY Pre AS and IB Diploma Task Expectations All sections of the task will be attempted please check you have answered all questions (even those on the back page) Answers should
More informationLLT Education Services
Rahul Arora 18. What chemical reaction is involved in the corrosion of iron? 19. Aluminum metal when burnt in air forms aluminium oxide. Write the balanced chemical equation for the reaction. 20. Is the
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 informationChapter 5 Chemical Calculations
Calculating moles Moles and elements Moles and compounds Moles and gases Moles and solutions Calculating formulae Finding the formula Chapter 5 Chemical Calculations Moles and chemical equations Checklist
More informationC2.6 Quantitative Chemistry Foundation
C2.6 Quantitative Chemistry Foundation 1. Relative masses Use the periodic table to find the relative masses of the elements below. (Hint: The top number in each element box) Hydrogen Carbon Nitrogen Oxygen
More information1 Chemical Reactions and Equations
1 Intext Questions On Page 6 Question 1. Why should a magnesium ribbon be cleaned before burning in air? Magnesium ribbon reacts with CO present in air to form a protective and inert layer of magnesium
More informationChapter 6. Chemical Reactions. Sodium reacts violently with bromine to form sodium bromide.
Chapter 6 Chemical Reactions Sodium reacts violently with bromine to form sodium bromide. Evidence of Chemical Reactions Chemical Equations Reactants Products Reactant(s): Substance(s) present before the
More informationChemical Reactions and Equations
1 Chemical Reactions and Equations SYLLABUS Chemical reactions: Chemical equation, balanced chemical equation, implications of a balanced chemical equation. Types of chemical reactions: combination, decomposition,
More informationNotes: Chemical Reactions. Diatomic elements: H 2, N 2, O 2, F 2, Cl 2, Br 2, I 2 I Bring Clay For Our New Hut OR HOBrFINCl
Name Chemistry-PreAP Notes: Chemical Reactions Period Review: Some elements do not occur as single atoms when uncombined with other elements. They will bond with themselves, forming a molecule. In any
More informationDescribing Chemical Reactions
Describing Chemical Reactions Key Terms chemical equation precipitate coefficient word equation formula equation reversible reaction A chemical reaction is the process by which one or more substances are
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 informationSummer Preparatory Tasks for A Level Chemistry 2017.
Summer Preparatory Tasks for A Level Chemistry 2017. Task One: Why have you chosen to complete an A Level in Chemistry? Research your future career and what subjects and grades are required to achieve
More informationSymbols. Table 1 A set of common elements, their symbols and physical state
Symbols Symbols are a kind of shorthand system for writing down elements and compounds. Each element has a particular one or two letter symbol. The first letter of a symbol is always capital, and if there
More informationTHE ST. MICHAEL SCHOOL THIRD FORM CHEMISTRY MANUAL 3 SYMBOLS AND FORMULAE, CHEMICAL BONDING AND CHEMICAL EQUATIONS
1 THE ST. MICHAEL SCHOOL THIRD FORM CHEMISTRY MANUAL 3 SYMBOLS AND FORMULAE, CHEMICAL BONDING AND CHEMICAL EQUATIONS COMPILED BY G.WALKER, L.WORRELL, T. HARDING REFERENCE BOOKS Anne Tindale Chemistry A
More informationChemical Reactions. All chemical reactions can be written as chemical equations.
Chemical Reactions All chemical reactions can be written as chemical equations. What is a Chemical Reaction? Chemical reactions represent chemical changes A chemical change occurs when a substance has
More informationUNIT 1 Chemical Reactions Part II Workbook. Name:
UNIT 1 Chemical Reactions Part II Workbook Name: 1 Molar Volume 1. How many moles of a gas will occupy 2.50 L at STP? 2. Calculate the volume that 0.881 mol of gas at STP will occupy. 3. Determine the
More informationChemical Reaction Defn: Chemical Reaction: when starting chemical species form different chemicals.
Chemical Reaction Defn: Chemical Reaction: when starting chemical species form different chemicals. Evidence to indicate that a chemical reaction has occurred: Temperature change Different coloured materials
More informationChapter 7. Chemical Reactions
Chapter 7 Chemical Reactions 1 All chemical reactions have two parts Reactants - the substances you start with Products- the substances you end up with The reactants turn into the products. Reactants Products
More informationUnit Learning Targets (L.T.):
Unit 9: Chemical Equations and Reactions Chapters 8 and 19 Name Block Unit Learning Targets (L.T.): By the end of the unit, students will be able to: Chapter 8: 1. Correctly write and balance chemical
More informationQuestions for "Reaction Bingo" 1. The starting substances in a chemical reaction.
Chemical Reactions Bingo, April 2011 1 Questions for "Reaction Bingo" 1. The starting substances in a chemical reaction. 2. A single compound gets broken apart in this type of reaction. (one of the 5 types
More informationCHEMISTRY 135 REVISION OF NAMES, FORMULAE AND EQUATIONS
CHEMISTRY 135 REVISION OF NAMES, FORMULAE AND EQUATIONS Answer the following questions as if you were going to hand them in for marking. You will be tested on them in class time. 1) Give the correct chemical
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 informationChemical Reactions CHAPTER Reactions and Equations
CHAPTER 9 Chemical Reactions 9.1 Reactions and Equations The process by which atoms of one or more substances are rearranged to form different substances is called a chemical reaction. There are a number
More informationBullers Wood School. Chemistry Department. Transition to A Level Chemistry Workbook. June 2018
Bullers Wood School Chemistry Department Transition to A Level Chemistry Workbook June 2018 This booklet contains questions for you to work through and answer over the summer to prepare for the A level
More informationChemical Reactions. Chemical Reactions Chemical reactions have a standard format when written:
0.3.notebook A chemical property is a behaviour that occurs when substances change to create a new substance. When a new substance is created, a chemical change has occurred. New colour Evidence of chemical
More informationFunsheet 3.0 [WRITING & BALANCING EQUATIONS] Gu/R. 2017
Funsheet 3.0 [WRITING & BALANCING EQUATIONS] Gu/R. 2017 Balance the following chemical equations. Remember, it is not necessary to write "1" if the coefficient is one. 1. N 2 + H 2 NH 3 2. KClO 3 KCl +
More informationWhat Do You Think? Investigate GOALS
Cool Chemistry Show Activity 4 Chemical Equations GOALS In this activity you will: Represent chemical changes using word equations and chemical equations. Distinguish between different classes of chemical
More informationChemical Reactions and Equations
Chemical Reactions and Equations Question 1: Why should a magnesium ribbon be cleaned before burning in air? Magnesium is very reactive metal. When stored it reacts with oxygen to form a layer magnesium
More informationTypes of Chemical Reactions (rxns.)
Types of Chemical Reactions (rxns.) Introduction Chemical reactions occur when bonds (between the electrons of atoms) are formed or broken Chemical reactions involve changes in the chemical composition
More information26. N 2 + H 2 NH N 2 + O 2 N 2 O 28. CO 2 + H 2 O C 6 H 12 O 6 + O SiCl 4 + H 2 O H 4 SiO 4 + HCl 30. H 3 PO 4 H 4 P 2 O 7 + H 2 O
Balance the following chemical equations: (Some may already be balanced.) 1. H 2 + O 2 H 2 O 2. S 8 + O 2 SO 3 3. HgO Hg + O 2 4. Zn + HCl ZnCl 2 + H 2 5. Na + H 2 O NaOH + H 2 6. C 10 H 16 + Cl 2 C +
More information2. Indicators of Chemical Rxns. Abbreviations of State (g) gas (l) liquid (s) solid (aq) aqueous a substance dissolved in water
Unit 6 Chemical Reactions 1. Parts of a Chemical Reaction 2. Indicators of a Chemical Reaction 3. Enthalpy 4. Balancing Chemical Equations 5. Word Equations 6. Classifying Chemical Reactions 7. Predicting
More informationChemical Reactions. A. Chemical Reactions And The Law Of Conservation Of Mass
Chemical Reactions A. Chemical Reactions And The Law Of Conservation Of Mass 1. A CHEMICAL REACTION is a change that produces new materials with different properties from the starting materials. Various
More informationReactants: Products: Definition:
Definition: A chemical reaction is a process in which one or more substances are changed to form new chemical substance(s) with different physical and chemical properties. Definition: A chemical reaction
More informationUnit 6.3 Types of Chemical reactions
Unit 6.3 Types of Chemical reactions Most chemical reactions can be classified into one of five types of reactions. It depends on both the reactants used and the products formed. The possible chemical
More informationCHAPTER 11: CHEMICAL REACTIONS. Mrs. Brayfield
CHAPTER 11: CHEMICAL REACTIONS Mrs. Brayfield WRITING EQUATIONS Write the chemical equation for the following: Magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen
More informationChemical reactions. C2- Topic 5
Chemical reactions C2- Topic 5 What is a chemical reaction? A chemical reaction is a change that takes place when one or more substances (called reactants) form one or more new substances (called products)
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 informationCh. 8 Chemical Reactions
Ch. 8 Chemical Reactions Intro to Reactions I II III IV V Signs of a Chemical Reaction Evolution of heat and light Formation of a gas Formation of a precipitate Color change Law of Conservation of Mass
More informationCHEMICAL REACTIONS & EQUATIONS
CHEMICAL REACTIONS & EQUATIONS PHYSICAL AND CHEMICAL CHANGE In our daily life many processes occur around us. Some of them do not lead to formation of any new substance, while others may lead to formation
More information8 Chemical Equations. Flames and sparks result when aluminum foil is dropped into liquid bromine.
8 Chemical Equations Flames and sparks result when aluminum foil is dropped into liquid bromine. Chapter Outline 8.1 The Chemical Equation 8.2 Writing and Balancing Chemical Equations 8.3 Types of Chemical
More informationMoles. Balanced chemical equations Molar ratios Mass Composition Empirical and Molecular Mass Predicting Quantities
Moles Balanced chemical equations Molar ratios Mass Composition Empirical and Molecular Mass Predicting Quantities Micro World atoms & molecules Macro World grams Atomic mass is the mass of an atom in
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 informationYear 10 Chemistry Exam June 2011 Multiple Choice. Section A Multiple Choice
Year 10 Chemistry Exam June 2011 Multiple Choice Section A Multiple Choice 1 An aqueous solution is obtained when: a. a substance dissolves in any liquid b. a substance is dissolved in water c. when a
More informationICSE Board Class IX Chemistry Paper 5 Solution
ICSE Board Class IX Chemistry Paper 5 Solution SECTION I Answer 1 i. Dalton used the symbol for oxygen and the symbol for hydrogen. Symbol represents gram atom(s) of an element. i Symbolic expression for
More informationHonors text: Ch 10 & 12 Unit 06 Notes: 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 informationQuantitative Chemistry. AQA Chemistry topic 3
Quantitative Chemistry AQA Chemistry topic 3 3.1 Conservation of Mass and Balanced Equations Chemical Reactions A chemical reaction is when atoms are basically rearranged into something different. For
More information2 nd Term Worksheet [ ] Subject Chemistry Class VII Name : Sec. :
1 chem (vii) 2 nd Term Worksheet [2018 19] Subject Chemistry Class VII Name : Sec. : Chapter 4 [Atomic Structure] Check Point: [62] [A] Answer the following questions: 1. What do you understand by the
More informationCHEMISTRY 2b SUMMARY
CHEMISTRY 2b SUMMARY Items in ITALLICS are HIGHER TIER NLY C2.4.1 RATES F REACTIN Speeding up, or slowing down, chemical reactions is important in everyday life and in industry The rate of a chemical reaction
More informationCHEMICAL REACTION. Engr. Yvonne Ligaya F. Musico 1
CHEMICAL REACTION Engr. Yvonne Ligaya F. Musico 1 Chemical Reaction Engr. Yvonne Ligaya F. Musico 2 Introduction Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken
More informationChemical Reaction Defn: Chemical Reaction: when starting chemical species form different chemicals.
Chemistry 11 Notes on Chemical Reactions Chemical Reaction Defn: Chemical Reaction: when starting chemical species form different chemicals. Evidence to indicate that a chemical reaction has occurred:
More informationChemical Reactions & Equations
Chemical Reactions & Equations + Evidence of Chemical Reactions Release of a gas Example: bubbles formed when magnesium and hydrochloric acid were mixed Color change Example: color went from clear to yellowish
More informationA-LEVEL TRANSITION COURSE SUMMER 2018 PART 2: USING CHEMICAL EQUATIONS
A-LEVEL TRANSITION COURSE SUMMER 2018 PART 2: USING CHEMICAL EQUATIONS MASS AQUEOUS VOLUME ` MOLAR MASS GASEOUS VOLUME MOLES CONCENTRATION REVISION FROM LESSON 1 How many moles? 1) Jahin weighs a sample
More informationUnit 4: Reactions and Stoichiometry
Unit 4: Reactions and Stoichiometry Reactions Chemical equation Expression representing a chemical reaction Formulas of reactants on the left side Formulas of products on the right side Arrow(s) connect(s)
More informationUnit 1 - Foundations of Chemistry
Unit 1 - Foundations of Chemistry Chapter 2 - Chemical Reactions Unit 1 - Foundations of Chemistry 1 / 42 2.1 - Chemical Equations Physical and Chemical Changes Physical change: A substance changes its
More informationChapter 8 Chemical Equations and Reactions
Chapter 8 Chemical Equations and Reactions 8-1 Describing Chemical Reactions Chemical reactions Matter undergoes 2 types of changes: 1.Physical changes no new substance produced 2.Chemical changes new/different
More informationTypes of Reactions. There are five main types of chemical reactions we will talk about:
Chemical Reactions Types of Reactions There are five main types of chemical reactions we will talk about: 1. Synthesis reactions 2. Decomposition reactions 3. Single displacement reactions 4. Double displacement
More informationDOUBLE DISPLACEMENT REACTIONS. Double your pleasure, double your fun
DOUBLE DISPLACEMENT REACTIONS Double your pleasure, double your fun Industrial processes produce unwanted by-products. Dissolved toxic metal ions-copper, mercury, and cadmium-are common leftovers in the
More informationF321: Atoms, Bonds and Groups Structure & Bonding
F321: Atoms, Bonds and Groups Structure & Bonding 1. This question is about different models of bonding and molecular shapes. Magnesium sulfide shows ionic bonding. What is meant by the term ionic bonding?
More informationUnit 11 Reactivity of metals
Unit 11 Reactivity of metals Comparing the reactivity of metals In unit 4, you learned that different extraction methods are used in the extractions of metals. Some metals, like silver and gold can exist
More informationChapter 8 Chemical Reactions
Chemistry/ PEP Name: Date: Chapter 8 Chemical Reactions Chapter 8: 1 7, 9 18, 20, 21, 24 26, 29 31, 46, 55, 69 Practice Problems 1. Write a skeleton equation for each chemical reaction. Include the appropriate
More informationChapter 7 - Chemical Reactions
Chapter 7 - Chemical Reactions Evidence of a Chemical Reaction If we could see the atoms and molecules that compose matter, we could easily identify a chemical reaction: Atoms combine with other atoms
More informationCHEMICAL REACTIONS. Introduction. Chemical Equations
CHEMICAL REACTIONS Chemistry I Chapter 7 1 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 Al 2 O 3 (s) The
More informationName Date Class STUDY GUIDE FOR CONTENT MASTERY
Chemical Reactions Section 10.1 Reactions and Equations In your textbook, read about evidence of chemical reactions. For each statement, write yes if evidence of a chemical reaction is present. Write no
More informationUnit 5 Chemical Reactions Notes. Introduction: Chemical substances have physical and chemical properties
Unit 5 Chemical Reactions Notes Introduction: Chemical substances have physical and chemical properties Physical Properties 2 Types of Physical Properties Extensive Physical Properties Intensive Physical
More informationUnit 5. Chemical reactions
Unit 5. Chemical reactions Index 1.- Physical and chemical phenomena...2 2.- What is a chemical reaction?...2 2.1. Chemical equation...2 2.2.- Balance of chemical reactions. Law of conservation of mass...3
More informationChemical formula - tells you how many atoms of each element are in a compound example: CO 2 (carbon dioxide) has one carbon atom and two oxygen atoms
Chemical Reactions Chemical formula - tells you how many atoms of each element are in a compound example: CO 2 (carbon dioxide) has one carbon atom and two oxygen atoms 2 points Chemical Equation - a short,
More information