1. Chemistry 12.1

2. 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.

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

4. 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?

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

6. 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.

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

8. Interpreting Chemical Equations
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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.

9. 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?

10. 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?

11. 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?

12. 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?

13. 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?

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

15. Conceptual Problem 12.1

16. Conceptual Problem 12.1

17. Conceptual Problem 12.1

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