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Ch. 12

Ch. 12. 12.1. The Arithmetic of Equations.

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Ch. 12

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  1. Ch. 12

  2. 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. 12.1 Using Everyday Equations • Using Everyday Equations • How is a balanced equation like a recipe?

  4. 12.1 Using Everyday Equations • A balanced chemical equation provides the same kind of quantitative information that a recipe does.

  5. 12.1 Using Everyday Equations • An equation can represent the manufacturing of a single tricycle.

  6. 12.1 Using Balanced Chemical Equations • Using Balanced Chemical Equations • How do chemists use balanced chemical equations?

  7. 12.1 Using Balanced 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.

  8. 12.2 Writing and Using Mole Ratios • Writing and Using Mole Ratios • How are mole ratios used in chemical calculations?

  9. 12.2 • In chemical calculations, mole ratios are used to convert between moles of reactant and moles of product, between moles of reactants, or between moles of products.

  10. 12.2 Writing and Using Mole Ratios • Mole-Mole Calculations • A mole ratio is a conversion factor derived from the coefficients of a balanced chemical equation interpreted in terms of moles.

  11. 12.2 Writing and Using Mole Ratios • To determine the number of moles in a sample of a compound, first measure the mass of the sample. Then use the molar mass to calculate the number of moles in that mass.

  12. Problem Solving 12.12 Solve Problem 12 with the help of an interactive guided tutorial.

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