Download Chapter 4 Chemical Reactions 3) (aq) indicates that the compound

Chapter 4 Chemical Reactions
3) (aq) indicates that the compound is dissolved in alcohol.
Answer:
True
False
Diff: 1
Reference: Section 4-1
5) In a solution of alcohol and water that is 70 % water, alcohol is the solvent.
Answer:
True
False
Diff: 1
Reference: Section 4-3
7) Calculations of the amounts of reactants used or products formed are called stoichiometry.
Answer:
True
False
Diff: 1
Reference: Section 4-3
8) The numbers in front of formulas in balanced equations are called stoichiometric
coefficients.
Answer:
True
False
Diff: 1
Reference: Section 4-3
11) How many grams of N2 are required to react with 2.30 moles of Mg in the following
process?
3 Mg + N2 → Mg3N2? (Mg = 24.3, N = 14.0 g/mol)
A) (2.30/3)(28.0)
B) (2.30/3)
C) (2.30)(28.0)
D) (2.30/3)/28.0
E) (2.30)(3)(28.0)
Answer: A
Diff: 1
Reference: Section 4-2
13) For the reaction 2 A1+ Fe2O3 → Al2O3 + 2 Fe, 2.5 g of A1 (27.0 g/mol) and 7.2 g of Fe2O3
(159.8 g/mol) produce how many g of Fe (55.9 g/mol)?
A) 2.5 (55.9/27.0)
B) 2.5 (55.9)(2)/(27.0)(2)
C) 7.2 (55.9)(2)/158.9
D) 7.2 (55.9/158.9)
E) 2.5 (55.9/158.9)
Answer: C
Diff: 1
Reference: Section 4-2
16) Gases emitted during volcanic activity often contain high concentrations of hydrogen sulfide
and sulfur dioxide. These gases may react to produce deposits of sulfur according to the
equation: 2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O (g)
For the complete reaction of 6.41 mol of hydrogen sulfide:
A) 308 g of sulfur is formed
B) 410 g of sulfur dioxide is consumed
C) 231 g of water vapor is produced
D) 320 g of total products result
E) 628 g of total reactants are consumed
Answer: A
Diff: 3
Reference: Section 4-2
18) Choose the INCORRECT statement.
A) A chemical equation is a shorthand way of representing a chemical reaction.
B) Calculations of the amounts of reactants used or products formed are called
stoichiometry.
C) The numbers in front of formulas in balanced equations are called stoichiometric
coefficients.
D) Molarity is defined as moles of solute per kg of solution.
E) The solvent determines the state of the solution.
Answer: D
Diff: 1
Reference: Section 4-3
22) 52.5 mL of a solution were diluted to a volume of 6.25 L and then had a concentration of 3.16
M. What was the molarity of the concentrated solution?
A) 3.16(52.5/6.25)
B) 3.16(6.25/52.5)
C) (3.16)(52.5)(6.25)
D) 3.16(52.5/6250)
E) (6.25)(3.16)/0.0525
Answer: E
Diff: 1
Reference: Section 4-3