Chapter 9 Notes Answers – Flashcards
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| Coefficients |
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| ratios that represent the relative number of molecules, atoms, or formula units in a chemical equation that are needed to maintain the law of conservation of matter. |
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| Mole Ratios |
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| Also called conversion factors, are the ratios created from the coefficients in the balanced chemical equation. |
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| Steps for Calculating the Masses of Reactants and Products in Chemical Reactions |
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| · Balance the equation for the reaction. · Convert the masses of reactants or products to moles. · Use the balanced equation to set up the appropriate mole ratio(s). · Use the mole ratio(s) to calculate the number of moles of the desired reactant or product. · Convert from moles back to masses. |
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| BCA Tables: Tables that are used to help organize stoichiometry problems. |
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| · Only moles can go into the BCA Table · Helps Visualize ratio |
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| Limiting Reagent (Reactant) |
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| The reactant that limits the amount of products that can be formed. It is used up first. |
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| Reactant(s) in Excess |
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| The reactant(s) that is/are present after the limiting reagent is used up. |
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| Steps of Solving Stoichiometry Problems Involving Limiting Reactants. |
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| · Write and balance the equation for the reaction. · Convert known masses of reactants or products to moles. · Using the numbers of moles of reactants or products and the appropriate mole ratios, determine which reactant is limiting. · Using the amount of the limiting reactant and the appropriate mole ratios, compute the number of moles of the desired product. · Convert from moles of product to grams of product, using the molar mass (if this is required by the problem. |
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| %Yield |
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| (Actually Yield / Theoretical Yield) x 100 |
