Name: 
 

Practice Test 3A



Multiple Choice
 

 1. 

Calculate the molar mass of (NH4)3AsO4
A)
156.96 g/mol
B)
165.02 g/mol
C)
193.03 g/mol
D)
417.80 g/mol
 

 2. 

Which of the following describes an oxidation?
A)
gain of electrons or gain of oxygen
B)
loss of electrons or gain of oxygen
C)
loss of electrons or gain of hydrogen
D)
loss of electrons or loss of oxygen
 

 3. 

Calculate the number of moles in 112 g of aspirin, C9H8O4.
A)
0.619
B)
1.18
C)
0.165
D)
1.61
 

 4. 

In the reaction shown below, how many kcal of heat is required to produce 32.0 g of O2?

mc004-1.jpg
A)
274 kcal
B)
68.5 kcal
C)
137 kcal
D)
548 kcal
 

 5. 

How many atoms are present in 0.040 mol of O2?
A)
2.4 x 1022
B)
4.8 x 1022
C)
6.6 x 1026
D)
1.5 x 1025
 

 6. 

Which of the following is an oxidation-reduction reaction?
A)
AgNO3  +  NaCl  mc006-1.jpg  AgCl  +  NaNO3
B)
CaCl2  +  Na2(SO2)2  mc006-2.jpg  CaSO2  +  2NaCl
C)
N2  +  O2  mc006-3.jpg  2NO
D)
KOH  +  HNO3  mc006-4.jpg  H2O  +  KNO3
 

 7. 

Calculate the mass of 3.0 x 1022 atoms of sulfur.
A)
0.16 g
B)
1.6 g
C)
160 g
D)
16 g
 

 8. 

When the equation shown below is balanced, the proper sequence of coefficients for each substance is

mc008-1.jpg
A)
2, 3, 1, 6
B)
2, 3, 6, 1
C)
2, 3, 3, 1
D)
3, 2, 1, 6
 

 9. 

What is oxidized and what is reduced in the following reaction?

mc009-1.jpg
A)
Al is oxidized and Br2 is reduced.
B)
AlBr3 is reduced and Al is oxidized.
C)
Al is reduced and Br2 is oxidized.
D)
AlBr3 is reduced and Br2 is oxidized.
 

 10. 

The mineral Fluorite contains 51.5% by mass calcium.  How many grams of calcium are in a 135 g sample of Fluorite?
A)
2.62 g
B)
0.381 g
C)
85.2 g
D)
69.5 g
 

 11. 

The reaction  mc011-1.jpg is an example of
A)
decomposition
B)
combination
C)
single replacement
D)
double replacement
 

 12. 

What type of reaction is shown bleow?

CH4  +  2 O2  mc012-1.jpg  CO2  +  2 H2O  +  218 kcal
A)
Exothermic
B)
Single replacement
C)
decomposition
D)
Endothermic
 

 13. 

In an endothermic reaction,
A)
the products have less energy than the reactants.
B)
energy is absorbed by the system.
C)
heat flow out of the system.
D)
temperature of the surroundings increases.
 

Short Answer
 
 
Balance each equation shown below:
 

 14. 

sa014-1.jpg
 

 15. 

sa015-1.jpg
 



 
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