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CHE 111 C3--Stoichiometry
Test Description: This game reviews topics covered in Chapter 3 of your text--stoichiometry.
Instructions: Answer all questions to get your test result.
1) CO2 + CaO = CaCO3 is an example of which reaction type?
A
combustion
B
decomposition
C
displacement
D
combination
2) Is this reaction balanced? C4H10 + 13 O2 = 4 CO2 + 5 H2O
A
yes
B
no
3) What is the % O in NaNO2?
A
20%
B
23%
C
46%
D
32%
4) How many H atoms are in 3 moles of NH3?
A
3.6 x 10^24
B
6.02 x 10^23
C
1.8 x 10^24
D
5.4 x 10^24
5) What is the mass of 1.2 x 10^24 molecules of H2O?
A
18 g
B
6.02 x 10^23 g
C
36 g
D
2.2 x 10^25 g
6) 2 Na + Cl2 = 2 NaCl is which reaction type?
A
displacement
B
combination
C
combustion
D
decomposition
7) The actual yield of a chemical reaction is almost always more than the theoretical yield.
A
False
B
True
C
Not enough information
8) 2 H2 + O2=2 H2O How many moles of water can be produced from the reaction of 6 mol H2 and 3 mol O2?
A
2
B
9
C
6
D
1
9) 2 H2 + O2 = 2 H2O. If 0.5 mol H2 and 0.5 mol O2 react, what is the excess reactant?
A
O2
B
H2O
C
H2
10) When Al + O2 = Al2O3 is balanced, the coefficient in front of Al2O3 is
A
1
B
6
C
2
D
4
*select an answer for all questions
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