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Make Up Test Stoichiometry

Total questions: 14

Worksheet time: 39mins

Name
Class
Date
1.

N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 1 moles of nitrogen?

a)

6 mol H

b)

2 mol H

c)

3 mol H

d)

1 mol H

2.

2H2   +   O2  →  2H2O
How many moles of water can be produced if 2moles H2 are used?

a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
3.
4 Al + 3 O2 –> 2 Al2O3  How much aluminum would be needed to completely react with 45 grams of O2?
a)
1.05 moles
b)
3.75 moles
c)
1.875 grams
d)
1.875 moles
4.
Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)
a)
1,2,2,2
b)
1,2,1,1
c)
2,1,1,1
d)
2,1,2,1
5.
 CaC₂(s) + 2H₂O(l)   -->   C₂H₂(g)   + Ca(OH)₂(aq)
how many grams of Ca(OH)₂ would be formed with 3.20 moles of CaC₂?
a)
119 g
b)
21.2 g
c)
114 g
d)
237 g
6.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
7.
In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?
a)

82%

b)
0.82%
c)
10.1 %
d)
100%
8.

The Formula to make S'mores is:
2C + 1M + G2 → C2MG2. If you have 4 Marshmallows (M), 8 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?

a)
5
b)
4
c)
8
d)
42
9.

How many liters of Na are there at STP, if 2 moles of Na are present?

a)

22.4 L

b)

44.8 L

c)

67.2 L

d)

none of these

10.

In a chemical reaction, the mass of reactants ___.

a)

is less than the mass of products

b)

is greater than the mass of products

c)

has no relationship to the mass of products

d)

is equal to the mass of products

11.

Complete the equation for the percent yield of a chemical reaction:

Percent yield=(________)÷(________)×100%

a)

actual yield; theoretical yield

b)

theoretical yield; actual yield

12.
How many particles are in a mole?
a)
602
b)
602 million
c)
602 moles
d)
6.02 x 1023
13.

What is the molar mass of NaOH?

a)

40.00 g/mol

b)

38.99 g/mol

c)

23.99 g/mol

d)

57.00 g/mol

14.

What best describes a Direct Graph, As number of molecules increases the number of moles ____________________

a)

Increases

b)

Decreases

c)

Remains the same