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Chemistry I Unit 8: Stoichiometry Text Questions from Wilbraham, et. al

Printable copy of the text questions from Wilbraham et. al's Chemistry I Unit 8: Stoichiometry. Includes information on balanced chemical equations, stoichiometry calculations, limiting reagents, theoretical and actual yields, and percent yield.

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Chemistry I Unit 8: Stoichiometry Text Questions from Wilbraham, et. al

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  1. Printable copy of TEXT Questions Chemistry I Unit 8: Stoichiometry Text Questions from Wilbraham, et. al

  2. 12.1 1. Like a recipe, a balanced chemical equation provides what kind of information? quantitative 2. A balanced chemical equation tells you what two things? what amounts of reactants to mix and what amounts of product to expect 3. When you know the quantity of one substance in a reaction, you can calculate… the quantity of any other substance consumed or created in the reaction 4. What is stoichiometry? the calculation of quantities in chemical reactions

  3. 4. What is stoichiometry? the calculation of quantities in chemical reactions 5. What is the most important information that a balanced chemical equation provides? the relative numbers of moles of reactants and products (indicated by the coefficients) 6. Does the total number of moles of reactants necessarily equal the total number of moles of product? no 7. What two things are conserved in every chemical reaction? mass and atoms

  4. 12.2 8. What is essential for all calculations involving amounts of reactants and products? a balanced equation 9. What are used to convert between moles of one substance and moles of another? mole ratios (which are given by the coefficients in the balanced equation) 10. In the laboratory, the amount of a substance is usually determined by measuring… its mass in grams 11. What can you calculate from the mole ratios? any measurement unit that is related to the mole

  5. 12.3 12. To make a new dish, cooks know that WHAT must be available? sufficient quantities of all the ingredients 13. A balanced equation is a chemist’s… recipe 14. What does the limiting reagent determine? the amount of product that can be formed by a reaction 15. What is the excess reagent? the reactant that is not completely used up 16. What is the first step in the solution? to convert each reactant to moles

  6. 17. What can be determined from the given amount of limiting reagent? the amount of product 18. The limiting reagent is NOT necessarily the one that… is present in the smaller amount by mass or volume 19. What is the theoretical yield? the maximum amount of product that could be formed from given amounts of reactants 20. What is the actual yield? the amount of product that actually forms when the reaction is carried out in the lab 21. What is the percent yield? the ratio of the actual yield to the theoretical yield

  7. 22. Write the equation for percent yield. 23. The percent yield is a measure of what? the efficiency of a reaction carried out in the laboratory 24. List two factors that cause percent yields to be less than 100%. the rxn. doesn’t go to completion; impure reactants were used; competing side reactions yield unexpected products; loss of product during filtration or transference

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