1-29
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. What type of reaction takes place when fluorine reacts with sodium bromide?
a. Single-replacement
c. Combination
b. Double-replacement
d. Decomposition
____
2. What is the probable product of a double-replacement reaction?
a. A new compound and the replaced metal
b. A new compound and the replaced nonmetal
c. Two different compounds
d. A single compound
____
3. What are the products of the double-replacement reaction between aqueous hydrogen bromide and aqueous
sodium hydroxide?
a. Sodium oxybromide and water
c. Sodium hydro bromide and hydroxyl ions
b. Sodium hydride, bromine, and water
d. Water and sodium bromide
____
4. Calculate the number of molecules in 4.0 mol H2O.
a. 0.60  1023 molecules
c. 2.4  10–23 molecules
24
b. 2.4  10 molecules
d. 2.4  1023 molecules
____
5. How many moles of Ag contain 4.49  1023 atoms Ag?
a. 0.745  1024 mol
c. 0.745 mol
b. 0.745  1023 mol
d. 27.0 mol
____
6. Calculate the number of atoms in 13.2 mol copper.
a. 2.19  1023 atoms
c. 7.95  10–23 atoms
b. 7.95  1024 atoms
d. 79.5  1023 atoms
____
7. Copper (Cu) is a transition element used in the making of coins. Calculate the mass in grams of 0.0420 moles
of copper.
a. 0.00697 g
c. 2.67 g
b. 0.252 g
d. 6.61 g
____
8. Determine the mass in grams of 0.0489 mol cobalt.
a. 0.00812 g
c. 2.88 g
b. 0.294 g
d. 0.000830 g
____
9. How many moles of potassium contain 3.70  1023 electrons potassium?
a. 0.615  1024 mol
c. 0.615 mol
23
b. 0.615  10 mol
d. 22.3 mol
____ 10. How many moles of calcium are in 425 g calcium (Ca)?
a. 10.6 mol
c. 171 mol
b. 70.5 mol
d. 255 mol
____ 11. Copper is one of a group of metals called the coinage metals. How many atoms of copper (Cu) are in a pure
copper coin weighing 12.0 g?
a. 0.0313  1023 atoms
c. 1.10  1023 atoms
b. 0.187  1023 atoms
d. 1.13  1023 atoms
____ 12. A balloon contains 4.50  1022 atoms of helium (He) gas. Calculate the mass of helium in grams.
a. 0.185 g
c. 0.0747 g
b. 0.0185 g
d. 0.299 g
____ 13. What is the molar mass of Ca(OH)2?
a. 57.008 g/mol
b. 73.080 g/mol
c. 73.088 g/mol
d. 74.092 g/mol
____ 14. What is the mass of 2.25 moles of sulfuric acid (H2SO4)?
a. 50.0 g
c. 112 g
b. 98.0 g
d. 220 g
____ 15. How many grams of potassium permanganate are in 2.20 moles?
a. 53.2 g
c. 242 g
b. 158 g
d. 347 g
____ 16. Determine the number of moles present in 32.5 g aluminum chloride.
a. 0.244 mol
c. 1.21 mol
b. 4.10 mol
d. 720 mol
____ 17. What is the mass in grams of 1.02  1024 atoms manganese (Mn)?
a. 0.112  101 g
c. 9.30  10–1 g
b. 0.169  101 g
d. 9.30  101 g
____ 18. How many moles are present in 21.2 g hydrochloric acid?
a. 0.582 mol
c. 21.0 mol
b. 1.72 mol
d. 128 mol
True/False
Indicate whether the statement is true or false.
____ 19. Word equations use words to indicate reactants and products of chemical reactions.
____ 20. The molecular formula for a compound is the formula with the smallest whole-number mole ratio of the
elements.
Completion
Complete each statement.
21. Forest fire releases energy in the form of ____________________ and ____________________.
22. A chemical reaction in which two or more substances react to produce a single product is called a(n)
____________________ reaction.
23. A reaction in which the atoms of one element replace the atoms of another element in a compound is called
a(n) ____________________ reaction.
24. In an aqueous solution, the solvent is always ____________________.
25. The mass in grams of 2.75  1021 atoms Li is ____________________ g.
26. The molar mass of carbon tetrachloride (C Cl4) is ____________________ g/mol.
27. The number of moles present in 165 g manganese is ____________________ mol.
Short Answer
28. Define reactants in a chemical reaction.
29. Define products in a chemical reaction.
30. Define a decomposition reaction.
31. List the steps needed to convert the number of atoms to the mass of an element.
Essay
32. A sample of aluminum chloride (AlCl3) has a mass of 37.2 g.
a. How many aluminum ions are present?
b. How many chloride ions are present?
c. What is the mass in grams of one formula unit of aluminum chloride?