NEW
Font size
WorksheetsStoichiometry Test (May 8th)
Total questions: 25
Worksheet time: 13mins
1. Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
a. qualitative analysis
b. entropy
c. chemical kinetics
d. stoichiometry
2. what is the study of the mass relationships of elements in compounds?
a. reaction stoichiometry
b. composition stoichiometry
c. percent yield
d. Avogadro's principle
3. What is the study of the mass relationships among reactants and products in a chemical reaction?
a. reaction stoichiometry
b. composition stoichiometry
c. electron configuration
d. periodic law
4. A determination of the masses and number of moles of sulfur and oxygen in the compound sulfur dioxide would be studied in
a. reaction stoichiometry
b. chemical kinetics
c. chemical equilibrium
d. composition stoichiometry
5. Which of the following would NOT be studied in the branch of chemistry called stoichiometry?
a. the mole ratio of aluminum and chlorine in aluminum chloride
b. the amount of energy required to break the ionic bonds in calcium fluoride
c. the mass of carbon produced when a known mass of sucrose decomposes
d. the number of moles of hydrogen that react completely with a known quantity of oxygen
6. A balanced chemical equation allows one to determine the
a. mole ratio of any two substances in the reaction
b. energy released in the reaction
c. electron configuration of all elements in the reaction
d. mechanism involved in the reaction
7. The coefficients in a chemical equation represent the
a. masses, in grams, of all reactants and products
b. relative numbers of moles of reactants and products
c. number of atoms in each compound in a reaction
d. number of valence electrons involved in the reaction
8. Each of the four types of reaction stoichiometry problems requires using a
a. table of bond energies
b. chart of electron configurations
c. Lewis structure
d. mole ratio
9. In the reaction N2 + 3H2 --> 2NH3, what is the mole ratio of nitrogen to ammonia?
a. 1 : 1
b. 1 : 2
c. 1 : 3
d. 2 : 3
10. In the reaction 2Al2O3 --> 4Al + 3O2, what is the mole ratio of aluminum to oxygen?
a. 10 : 6
b. 3 : 4
c. 2 : 3
d. 4 : 3
11. The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) --> 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?
a. 1.0 mol
b. 2.0 mol
c. 3.0 mol
d. 6.0 mol
12. For the reaction AgNO3 + NaCl --> NaNO3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7 mol of silver nitrate AgNO3?
a. 1.0 mol
b. 2.3 mol
c. 7.0 mol
d. 21 mol
13. For the reaction 2H2 + O2 --> 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?
a. 2.00 g
b. 6.00 g
c. 54.0 g
d. 108 g
14. For the reaction SO3 + H2O --> H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid?
a. 80.0 g
b. 160 g
c. 240 g
d. 320 g
15. For the reaction 2Fe + O2 --> 2FeO, how many grams of iron oxide are produced from 8.00 mol of iron?
a. 71.8 g
b. 574 g
c. 712 g
d. 1310 g
16. For the reaction 2HNO3 + Mg(OH)2 --> Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3?
a. 148 g
b. 445 g
c. 592 g
d. 818 g
17. For the reaction 2KlO3 --> 2KCl + 3O2, how many moles of potassium chlorate are required to produce 250 g of oxygen?
a. 2.0 mol
b. 4.3 mol
c. 4.9 mol
d. 5.2 mol
18. For the reaction 2Na + 2H2O --> 2NaOH + H2, how many grams of hydrogen are produced if 120. g of sodium and 80. g of water are available?
a. 4.5 g
b. 44 g
c. 80. g
d. 200. g
19. For the reaction SO3 + H2O --> H2SO4, calculate the percent yield if 500. g of sulfur trioxide react with excess water to produce 575 g of sulfuric acid
a. 82.7%
b. 88.3%
c. 91.2%
d. 93.9%
20. For the reaction Cl2 + 2KBr --> 2KCl + Br2, calculate the percent yield if 200. g of chlorine react with excess potassium bromide to produce 410. g of bromine
a. 73.4%
b. 82.1%
c. 91.0%
d. 98.9%
21. Which reactant controls the amount of product formed in a chemical reaction?
a. excess reactant
b. mole ratio
c. composition reactant
d. limiting reactant
22. A chemical reaction involving substances A and B stops when B is completely used. B is the...
a. excess reactant
b. limiting reactant
c. primary reactant
d. primary product
23. What is the mole ratio of the actual yield to the theoretical yield, multiplied by 100%?
a. mole ratio
b. percent yield
c. Avogadro yield
d. excess yield
24. In most chemical reactions, the amount of product obtained is
a. equal to the theoretical yield
b. less than the theoretical yield
c. more than the theoretical yield
d. more than the percent yield
25. A chemist interested in the efficiency of a chemical reaction would calculate the
a. mole ratio
b. energy released
c. percent yield
d. rate of reaction
