Name:    Unit 9 Pre-Test

Please note:  All of the equations given are balanced.

1.

For the reaction
C  +  2 H2  -->  CH4
how many moles of hydrogen are required to produce 10 moles of methane (CH4)?
 A 2 B 4 C 10 D 20

2.

For the reaction
2 H2  +  O2  -->  2 H2O
how many grams of water are produced from 6.00 moles of hydrogen?
 A 2.00 B 6.00 C 54.0 D 108

3.

For the reaction
N2  +  3 H2  -->  2 NH3
how many moles of nitrogen are required to produce 18 moles of ammonia (NH3)?
 A 9 B 18 C 27 D 36

4.

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
 A theoretical yield C percent yield B mole ratio D actual yield

5.

In the reaction
6 CO2  +  6 H2O  -->  C6H12O6  +  6 O2
the mole ratio of water to oxygen is
 A 2 : 1 B 1 : 1 C 3 : 2 D 6 : 8

6.

In the equation
2 KClO3  -->  2 KCl  +  3 O2
the number of moles of oxygen produced when 1.0 mole of potassium chlorate is decomposed is
 A 1.0 B 1.5 C 2.0 D 3.0

7.

The number of moles of aluminum atoms reacting with 3 moles of oxygen molecules in the following balanced equation is
4 Al  +  3 O2  -->  2 Al2O3
 A 1 B 2 C 3 D 4

8.

In the reaction
A  +  B  -->  C  +  D
if there is more reactant B than is required to react with all of reactant A, then
 A A is the limiting reactant C there is no limiting reactant B B is the limiting reactant D no product can be formed

9.

When the limiting reactant in a chemical reaction is completely used, the
 A excess reactants begin combining C reaction speeds up B reaction slows down D reaction stops

10.

In the reaction
2 C2H2 (g)  +  5 O2 (g)  -->  4 CO2 (g)  +  2 H2O (g)
what is the total number of moles of acetylene (C2H2) needed to completely react with 40. grams of oxygen?
 A 0.25 B 0.50 C 0.75 D 1.0

11.

How many grams of water are needed to produce 22.4 grams of hydrogen bromide via the following reaction?                    2 Br2  +  2 H2O  -->  4 HBr  +  O2
 A 201 g B 4.98 g C 9.97 g D 2.49 g