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Chemistry 12.1

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**The Arithmetic of Equations**

12.1 The Arithmetic of Equations More than 3000 cocoons are needed to produce enough silk to make just one elegant Japanese kimono. Like silk manufacturers, chemists must know how much reactant they need to make a certain amount of product. Determining the quantities of reactants and products in a reaction requires a balanced chemical equation.

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**Using Everyday Equations**

12.1 Using Everyday Equations Using Everyday Equations How is a balanced equation like a recipe?

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**Using Everyday Equations**

12.1 Using Everyday Equations A balanced chemical equation provides the same kind of quantitative information that a recipe does. A cookie recipe tells you the number of cookies that you can expect to make from the listed amounts of ingredients. Using Models How can you express a cookie recipe as a balanced equation?

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**Using Everyday Equations**

12.1 Using Everyday Equations An equation can represent the manufacturing of a single tricycle.

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**Using Balanced Chemical Equations**

12.1 Using Balanced Chemical Equations Using Balanced Chemical Equations How do chemists use balanced chemical equations?

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**Using Balanced Chemical Equations**

12.1 Using Balanced Chemical Equations Chemists use balanced chemical equations as a basis to calculate how much reactant is needed or product is formed in a reaction. The calculation of quantities in chemical reactions is a subject of chemistry called stoichiometry.

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12.1

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12.1

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12.1

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12.1

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for Sample Problem 12.1 Problem Solving 12.1 Solve Problem 1 with the help of an interactive guided tutorial.

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**Interpreting Chemical Equations**

12.1 Interpreting Chemical Equations Interpreting Chemical Equations In terms of what quantities can you interpret a balanced chemical equation?

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**Interpreting Chemical Equations**

12.1 Interpreting Chemical Equations A balanced chemical equation can be interpreted in terms of different quantities, including numbers of atoms, molecules, or moles; mass; and volume.

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**Interpreting Chemical Equations**

12.1 Interpreting Chemical Equations Number of Atoms The balanced chemical equation for the formation of ammonia can be interpreted in several ways. Predicting How many molecules of NH3 could be made from 5 molecules of N2 and 15 molecules of H2?

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**Interpreting Chemical Equations**

12.1 Interpreting Chemical Equations Number of Molecules The balanced chemical equation for the formation of ammonia can be interpreted in several ways. Predicting How many molecules of NH3 could be made from 5 molecules of N2 and 15 molecules of H2?

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**Interpreting Chemical Equations**

12.1 Interpreting Chemical Equations Moles The balanced chemical equation for the formation of ammonia can be interpreted in several ways. Predicting How many molecules of NH3 could be made from 5 molecules of N2 and 15 molecules of H2?

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**Interpreting Chemical Equations**

12.1 Interpreting Chemical Equations Mass The balanced chemical equation for the formation of ammonia can be interpreted in several ways. Predicting How many molecules of NH3 could be made from 5 molecules of N2 and 15 molecules of H2?

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**Interpreting Chemical Equations**

12.1 Interpreting Chemical Equations Volume The balanced chemical equation for the formation of ammonia can be interpreted in several ways. Predicting How many molecules of NH3 could be made from 5 molecules of N2 and 15 molecules of H2?

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**Interpreting Chemical Equations**

12.1 Interpreting Chemical Equations The balanced chemical equation for the formation of ammonia can be interpreted in several ways. Predicting How many molecules of NH3 could be made from 5 molecules of N2 and 15 molecules of H2?

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**Mass Conservation in Chemical Reactions**

12.1 Mass Conservation in Chemical Reactions Mass Conservation in Chemical Reactions What quantities are conserved in every chemical reaction?

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**Mass Conservation in Chemical Reactions**

12.1 Mass Conservation in Chemical Reactions Mass and atoms are conserved in every chemical reaction.

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Conceptual Problem 12.1

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Conceptual Problem 12.1

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Conceptual Problem 12.1

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**for Conceptual Problem 12.1**

Problem Solving 12.4 Solve Problem 4 with the help of an interactive guided tutorial.

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12.1 Section Quiz. 12.1.

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12.1 Section Quiz. 1. A manufacturer of bicycles has 5350 wheels, frames, and 2655 handlebars. How many bicycles can be manufactured using these parts? 2675 bicycles 2655 bicycles 3023 bicycles 5350 bicycles

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**2. A reaction that produces iron metal from iron ore is shown below.**

12.1 Section Quiz. 2. A reaction that produces iron metal from iron ore is shown below. Fe2O3•H2O(s) + 3CO(g) 2Fe(s) + 3CO2(g) + H2O(g) In this equation, the volume of gas at STP that reacts and the volume of gas at STP produced will be 3 L and 4 L. 67.2 L and 89.6 L. 67.2 L and 67.2 L 3 L and 3 L

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12.1 Section Quiz. 3. What is conserved in the reaction shown below? H2(g) + Cl2(g) 2HCl(g) only mass only mass and number of moles only mass, number of moles, and number of molecules mass, number of moles, number of molecules, and volume

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