Chem 105 Ch3 Quiz 4 Spring 09

Name: __________ ________________________		Score _______/10		3/11/09

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

1.	The reaction of calcium with elemental chlorine yields calcium chloride. Write a balanced chemical equation for this reaction.
a) Ca(s)  +  Cl2(g)  →  CaCl(s)  +  Cl(g)
b) Ca(s)  +  Cl2(g)  →  CaCl2(s)
c) Ca(s)  +  2 Cl2(g)  →  CaCl4(s)
d) 2 Ca(s)  +  Cl2(g)  →  2 CaCl(s)
e) 4 Ca(s)  +  Cl2(g)  →  2 Ca2Cl(s)

2.	The products of the complete combustion of a hydrocarbon are carbon dioxide and water. Write a balanced chemical equation for the combustion of pentane, C5H12.
a) C5H12(g)  +  8 O2(g)  →  5 CO2(g)  +  6 H2O(g)
b) C5H12(g)  →  5 C(s)  +  6 H2(g)
c) C5H12(g)  +  9 O2(g)  →  4 CO2(g)  +  5 H2O(g)
d) C5H12(g)  +  11 O2(g)  →  C5O10(g)  +  6 H2O(g)
e) C5H12(g)  +  11 O2(g)  →  5 CO2(g)  +  12 H2O(g)

3.	Copper reacts with nitric acid to produce copper(II) nitrate, nitrogen dioxide gas, and water.
		Cu(s)  +  4 HNO3(aq)  →  Cu(NO3)2(aq)  +  2 NO2(g)  +  2 H2O(l)
If you have 0.500 moles of Cu, 
a) you need at least 0.125 moles of HNO3 to produce 0.500 moles of Cu(NO3)2.
b) you need at least 0.250 moles of HNO3 to produce 0.500 moles of Cu(NO3)2.
c) you need at least 2.00 moles of HNO3 to produce 0.500 moles of Cu(NO3)2.
d) you need at least 2.00 moles of HNO3 to produce 1.00 moles of Cu(NO3)2.
e) you need at least 2.00 moles of HNO3 to produce 2.00 moles of Cu(NO3)2.

4.	Which of the following compounds will be soluble in water: KNO3, Ca3(PO4)2, CuCl2, and Fe2S3?
a) KNO3 and Ca3(PO4)2
b) KNO3 and CuCl2
c) Ca3(PO4)2 and Fe2S3
d) CuCl2 and Fe2S3
e) KNO3, Ca3(PO4)2, and Fe2S3

5.	Nitroglycerine decomposes violently according to the unbalanced chemical equation below.  How many total moles of gases are produced from the decomposition of 1.00 mol C3H5(NO3)3?
		
C3H5(NO3)3(l)  →  CO2(g)  +  N2(g)  +  H2O(g)  +  O2(g)

a) 4.00 mol	b) 6.50 mol	c) 7.25 mol	d) 16.5 mol	e) 29.0 mol