PERIODIC TABLE OF ELEMENTS. 4/23/14 Chapter 7: Chemical Reactions 1

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1 PERIODIC TABLE OF ELEMENTS 4/23/14 Chapter 7: Chemical Reactions 1

2 CHAPTER 7: CHEMICAL REACTIONS 7.1 Describing Reactions 7.2 Types of Reactions 7.3 Energy Changes in Reactions 7.4 Reaction Rates 7.5 Equilibrium 4/23/14 Chapter 7: Chemical Reactions 2

3 7.1 DESCRIBING CHEMICAL REACTIONS n n Vocabulary: reactants, products, chemical equation, coefficients, mole, molar mass. Objectives: n Interpret chemical equations in terms of reactants, products, and conservation of mass. n Balance chemical equations by manipulating coefficients. n Convert between moles and mass of a substance using molar mass. n Calculate amounts of reactants or products by using molar mass, mole ratios, and balanced chemical equations. 4/23/14 Chapter 7: Chemical Reactions 3

4 DESCRIBING CHEMICAL REACTIONS Charcoal Burning Physical or Chemical Change? Why? 4/23/14 Chapter 7: Chemical Reactions 4

5 DESCRIBING CHEMICAL REACTIONS Charcoal Burning Physical or Chemical Change? Why? Chemical Change C reacts with O à carbon dioxide & heat 4/23/14 Chapter 7: Chemical Reactions 5

6 CHEMICAL EQUATIONS What substance is present before & after chemical reaction? Before: carbon (C) & oxygen (O 2 ) After: carbon dioxide gas 4/23/14 Chapter 7: Chemical Reactions 6

7 CHEMICAL EQUATIONS n reactants - substances that undergo a change in a chemical reaction n products - new substances formed as a result of a chemical reaction 4/23/14 Chapter 7: Chemical Reactions 7

8 USING EQUATIONS TO REPRESENT REACTIONS Reactants Products Burning of charcoal: What are the Reactants? Products? 4/23/14 Chapter 7: Chemical Reactions 8

9 USING EQUATIONS TO REPRESENT REACTIONS Reactants Products Burning of charcoal: What are the Reactants? Carbon + Oxygen Products? Carbon dioxide 4/23/14 Chapter 7: Chemical Reactions 9

10 USING EQUATIONS TO REPRESENT REACTIONS Reactants Products Burning of charcoal: What are the Reactants? Carbon + Oxygen Products? Carbon dioxide Simply by writing chemical formulas C + O 2 CO 2 4/23/14 Chapter 7: Chemical Reactions 10

11 USING EQUATIONS TO REPRESENT REACTIONS C + O 2 CO 2 carbon and oxygen react & form carbon dioxide Or reaction of carbon & oxygen yields carbon dioxide chemical equation - representation of a chemical reaction in which reactants and products are expressed as a formula 4/23/14 Chapter 7: Chemical Reactions 11

12 CONSERVATION OF MASS n mass of reactants = mass of products n i.e. mass of C & O 2 that reacted = mass of CO 2 produced n Law of conservation of mass states mass is neither created nor destroyed in a chemical reaction. Antoine Lavoisier /23/14 Chapter 7: Chemical Reactions 12

13 CONSERVATION OF MASS atom of carbon reacts with 1 molecule of oxygen and form 1 molecule of carbon dioxide. 4/23/14 Chapter 7: Chemical Reactions 13

14 CONSERVATION OF MASS # of atoms on left side = # of atoms on right mass is conserved 4/23/14 Chapter 7: Chemical Reactions 14

15 BALANCING EQUATIONS n Hydrazine, N 2 H 4 (compound found in rocket fuel) n Burned in presence of oxygen reaction produces nitrogen, water vapor, and heat. N 2 H 4 + O 2 à N 2 + H 2 O n Is this balanced (does # of atoms on left side = # on right side)? 4/23/14 Chapter 7: Chemical Reactions 15

16 BALANCING EQUATIONS n In order to show that mass is conserved during a reaction, a chemical equation must be balanced. n How can you balance a chemical equation? 4/23/14 Chapter 7: Chemical Reactions 16

17 BALANCING EQUATIONS n In order to show that mass is conserved during a reaction, a chemical equation must be balanced. n How can you balance a chemical equation? n Change coefficients n changes amount of reactant or product represented in chemical equation n Never change subscript!!! n Coefficient number that appears before a formula 4/23/14 Chapter 7: Chemical Reactions 17

18 BALANCING EQUATIONS N 2 H 4 + O 2 à N 2 + H 2 O n Step 1: Count # of atoms of each element on each side of equation. 4/23/14 Chapter 7: Chemical Reactions 18

19 BALANCING EQUATIONS 4/23/14 Chapter 7: Chemical Reactions 19

20 BALANCING EQUATIONS N 2 H 4 + O 2 à N 2 + H 2 O n Step 2: Change one or more coefficients until the equation is balanced. 4/23/14 Chapter 7: Chemical Reactions 20

21 BALANCING EQUATIONS N 2 H 4 + O 2 à N 2 + H 2 O n Step 2: Change one or more coefficients until the equation is balanced. N 2 H 4 + O 2 à N 2 + 2H 2 O Equation is now balanced! Tutorial on how to balance out equations: 4/23/14 Chapter 7: Chemical Reactions 21

22 BALANCING EQUATIONS 4/23/14 Chapter 7: Chemical Reactions 22

23 BALANCING EQUATIONS 4/23/14 Chapter 7: Chemical Reactions 23

24 COUNTING WITH MOLES n units of atoms & molecules too small to be practical n chemical reactions involve large #s of small particles à use counting unit called the mole to measure amounts of a substance 4/23/14 Chapter 7: Chemical Reactions 24

25 COUNTING WITH MOLES n mole (mol) - amount of a substance that contains approximately 6.02 x particles of that substance n i.e. mole of iron is 6.02x10 23 atoms of iron n 6.02 x is known as Avogadro s number 4/23/14 Chapter 7: Chemical Reactions 25

26 MOLAR MASS n mole of 1 substance may have different mass than mole of different substance i.e. C molar mass = 12.0 g S molar mass = 32.1 g n molar mass - mass of one mole of a substance n molar mass = atomic mass of element (in grams) n i.e. carbon (C) atomic mass = amu molar mass = grams 6 C Carbon /23/14 Chapter 7: Chemical Reactions 26

27 MOLAR MASS n How do you calculate molar mass for a compound? 4/23/14 Chapter 7: Chemical Reactions 27

28 MOLAR MASS n How do you calculate molar mass for a compound? Answer: Add up atomic masses of component atoms & express in grams 4/23/14 Chapter 7: Chemical Reactions 28

29 MOLAR MASS n What is the molar mass of a carbon dioxide molecule? 4/23/14 Chapter 7: Chemical Reactions 29

30 MOLAR MASS n What is the molar mass of a carbon dioxide molecule? n C: 12.0 amu n O: 2 x 16.0 amu = 32 amu n 12.0 amu amu = 44.0 amu = 44.0g 4/23/14 Chapter 7: Chemical Reactions 30

31 MOLAR-MASS CONVERSIONS n Once you know molar mass, can covert moles into mass (or vice versa). Express as conversion factor. n Example: CO 2 Molar Mass = 44.0 grams 44.0 g CO 2 or 1 mol CO 2 1 mol CO 2 44.g CO 2 4/23/14 Chapter 7: Chemical Reactions 31

32 MOLAR-MASS CONVERSIONS n 55.0 grams of CO 2. To Calculate how many moles of CO 2 you have, multiply mass by conversion factor g CO 1 mol CO 2 x 2 = 1.25 mol CO 2 44.g CO 2 4/23/14 Chapter 7: Chemical Reactions 32

33 CHEMICAL CALCULATIONS n Chemical equation tells you how to relate amounts of reactants to amounts of products. n Molar masses let you convert amounts of reactants and amounts of product into masses. 4/23/14 Chapter 7: Chemical Reactions 33

34 CHEMICAL CALCULATIONS n Balanced equation for formation of water: 2H 2 + O 2 à 2H 2 O 2 molecules of hydrogen react with 1 molecule of oxygen and form 2 molecules of water 4/23/14 Chapter 7: Chemical Reactions 34

35 CHEMICAL CALCULATIONS: CONVERTING MASS TO MOLES n In terms of moles equation reads: 2 moles of hydrogen react with 1 mole of oxygen and form 2 moles of water 4/23/14 Chapter 7: Chemical Reactions 35

36 CHEMICAL CALCULATIONS: CONVERTING MASS TO MOLES n molar mass = atomic mass 4/23/14 Chapter 7: Chemical Reactions 36

37 CHEMICAL CALCULATIONS: CONVERTING MASS TO MOLES n Molar masses let you convert amounts of reactants & amounts of product into masses n To convert from moles to mass, use molar masses as conversion factors 4/23/14 Chapter 7: Chemical Reactions 37

38 CHEMICAL CALCULATIONS: CONVERTING MASS TO MOLES (2 mol x 2 g/mol) + (1 mol x 32.0 g/mol) à (2 x 18.0 g/mol) 4.0 grams of H 2 reacts with 32.0 grams of O 2 and forms 36.0 grams of H 2 O. 4/23/14 Chapter 7: Chemical Reactions 38

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