Name:______
Date:______
Period:______
Chapter 7 Test (a)
1) Before a chemical reaction can be written, one must know:
a) The atomic mass of all the elements in the reaction
b) The molar mass of all the compounds
c) The symbols and formulas for all the reactants and products
d) The number of moles of all the reactants and products
e) None of the above
2) An aqueous solution is:
a) any liquid with another compound dissolved in it
b) Any ionic compound with water dissolved in it
c) Water with a molecular compound dissolved in it
d) Water with another compound dissolved in it
e) None of the above
3) Which of the following statements about writing molecular, complete and net ionic equations is FALSE?
a)A molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction
b)A complete ionic equation is a chemical equation showing all of the species as they are actually present in solution
c)A net ionic equation is an equation showing only the species that actually change during the reaction
d)A spectator ion remains unchanged in the reaction and appears on both sides of the equation
e)All the statements are true
4) What are the coefficients for the following reaction when it is properly balanced?
___Nitrogen monoxide + ____carbon monoxide ____nitrogen + ___carbon dioxide
a)2,1,1,2
b)2,2,1,2
c)2,2,2,1
d)1,1,2,2
e)None of the above
5) Which of the following compounds is INSOLUBE?
a) Potassium acetate
b) Lithium carbonate
c) Magnesium bromide
d) Aluminum sulfide
e) None of the above
6) Which of the following statements about balancing equations is FALSE?
a) If there is no coefficient or subscript, a one is implied
b) When coefficients are added the type of compound is changed in the chemical reaction
c) Subscripts are multiplied by the coefficients to determine the number of atoms in a compound
d) Coefficients are added to compounds to ensure both sides of the reactions have equal number of each atom
e) All of the above statements are true statements
7) Consider the following precipitation reaction:
Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq)
Which ion(s) would NOT be spectator ions?
a)Pb 2+; NO3-
b)K+; I-
c)NO3-; K+
d)Pb2+; I-
e)All of the above ions are in the net ionic equation
8) A precipitate (solid product) is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of:
a) Iron (III) chloride
b) Potassium chloride
c) Magnesium chloride
d) Barium chloride
e) None of the above
9) What type of reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution?
a) Precipitation reaction
b) Acid-base neutralization
c) Oxidation-reduction reaction
d) Gas evolution reaction
e) No reaction
10) What is the gas produced when hydrochloric acid id reacted with ammonium carbonate?
a) NH3b) Cl2c) H2d) CO2e) None of the above
11) What type of reaction is the generic equation A + BC AC + B?
a) Synthesis
b) Decomposition
c) Single-displacement
d) Double-displacement
e) None of the above
12) When a solution of magnesium chloride and silver nitrate are mixed the net ionic equation is:
a) Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) 2NO3-(aq) Mg2+(aq) + 2NO3-(aq) + 2AgCl(s)
b) Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) 2NO3-(aq) Mg(NO3)2(aq) + 2AgCl(s)
c) Mg2+(aq) + 2NO3-(aq) Mg(NO3)2(aq)
d) Ag+(aq) + Cl-(aq) AgCl(s)
e) None of the above
13) Liquid ethanol (C2H5OH), on complete combustion in air produces:
1) CO2
2) H2
3) H2O
a)1 and 2 only
b)1 and 3 only
c)2 and 3 only
d)All 1,2,3
e)None of them
14) What type of reaction is the generic equation AB + CD AD + CB
a) Synthesis
b) Decomposition
c) Single-displacement
d) Double-displacement
e) None of the above
15) What is the molecular equation for the reaction of hydrochloric acid with potassium hydroxide?
a) H2Cl + 2KOH H2O + 2KCl
b) 2HCl + K(OH)2 2H2O + KCl2
c) H+ + OH- H2O
d) HCl + KOH H2O + KCl
16) Consider the following precipitation reaction:
Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq)
What is the complete ionic equation?
a)Pb2+ + (NO3)2- + 2K+ + 2I- PbI2(s) + 2K+ + 2NO3-
b)Pb2+ + 2NO3- + 2K+ + 2I- PbI2(s) + 2K+ + NO3-
c)Pb2+ + 2NO3- + 2K+ + 2I- PbI2(s) + 2K+ + 2NO3-
d)Pb2+ + 2NO3- + 2K+ + 2I- Pb2+ + 2I- + 2K+ + 2NO3-
e)None of the above
17) What type of reaction occurs when silver nitrate solution is mixed with sodium chloride?
a)a) Precipitation reaction
b) Acid-base neutralization
c) Oxidation-reduction reaction
d) Gas evolution reaction
e) No reaction
18) Consider the following precipitation reaction:
Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq)
Which ion(s) would NOT present in the complete ionic equation?
a)Pb 2+
b)K+
c)NO3-
d)I-
e)All of the above ions are in the complete ionic equation
19) What are the coefficients for the following reaction when it is properly balanced?
___Hydrochloric acid + ___magnesium ___magnesium chloride + ___hydrogen
a)2,1,1,1
b)2,1,2,2
c)1,2,1/2,1
d)1,1,1,2
e)None of the above
20) A reaction which forms a solid product is an example of a(n) ______.
a) Precipitation reaction
b) Acid-base neutralization
c) Oxidation-reduction reaction
d) Gas evolution reaction
e) No reaction
21) Consider the following precipitation reaction:
Pb(NO3)2(aq) + 2KI(aq) PbI2(s) + 2KNO3(aq)
Which compound would not form ions in the complete ionic equation?
a)PbI2
b)KNO3
c)Pb(NO3)2
d)KI
e)All compounds form ions in the complete ionic equation
22) Identify the double displacement reactions among the following:
1. KCl(aq) + AgNO3(aq) AgCl(s) + KNO3(aq)
2. Na2SO4(aq) + BaCl2(aq) BaSo4(s) + 2NaCl(aq)
3. H2SO4(aq) + 2NaOH(aq) Na2SO4(aq) + 2H2O(l)
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) all of 1,2,and 3
e) None of 1,2, and 3
23) The net ionic equation for the reaction of sodium hydroxide plus hydrochloric acid is Na+ + Cl- NaCl (s)
a) True
b) False
24) Carbon dioxide gas is a product when you react sulfuric acid with sodium hydrogen carbonate
a) True
b) False
25) The following reaction is balanced and nothing further has to be done to it:
2HNO3(aq) + Na2SO3(aq) H2SO3(g) + 2NaNO3 (aq)
a)True
b)False