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CHEM 107
Ch. 7 – Quiz
Question 1 (Mandatory) (10 points)
A reaction which forms a gaseous product is an example of a(n)________. gas evolution reaction precipitation reaction combustion reaction oxidation-reduction reaction
Question 2 (Mandatory) (10 points)
A reaction which forms a solid product is an example of a(n): combustion reaction. gas evolution reaction. oxidation-reduction reaction precipitation reaction.
Question 3 (Mandatory) (10 points)
A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen- containing compounds is an example of a(n): gas evolution reaction. combustion reaction. acid-base reaction. precipitation reaction.
Question 4 (Mandatory) (10 points)
When the equation, ___N2 + ___H2 → ___NH3 is balanced, the coefficient of hydrogen is:
Question 5 (Mandatory) (10 points)
What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate → ___lead (II) iodide +___potassium acetate 3, 2, 2, 1 1, 1, 2, 2 2, 1, 1, 1 2, 1, 1, 2 Question 6 (Mandatory) (10 points) In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products? (l) (w) (s) (g) Question 7 (Mandatory) (10 points) Sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas. Which equation below best describes the balanced equation for this reaction? Na + H2O → NaOH (aq) + H2 (g) 2Na + 2H2O → 2NaOH (aq) + H2 (g) Na + H2O → NaOH (aq) + H (g) S + H2O → SOH (aq) + H (g) Question 8 (Mandatory) (10 points) Which is a spectator ion from the following complete ionic equation: Ag+(aq) + NO3-(aq) + K+ (aq) + Br-(aq) → AgBr(s) + K+(aq) + NO3- (aq) Ag+
Question 9 (Mandatory) (10 points) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct complete ionic equation? Pb2+ + (NO3)2- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + NO3- Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- Pb2+ + 2NO3- + 2K+ + 2I- → Pb2+ + 2I- + 2K+ + 2NO3- Question 10 (Mandatory) (10 points) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct net ionic equation? Pb2+ + 2I- → PbI2(s) Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- 2NO3- + 2K+ → 2KNO Pb2+ + I2- → PbI2(s)
