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Matter 6
Test Description: Chemical Bonds and Balancing Equations
Instructions: Answer all questions to get your test result.
1) What does a subscript describe in a molecular formula?
A
How large the electric charge on an atom or molecule
B
How many bonds are formed in a molecule
C
How many of a particular element are in a molecule
D
How many molecules are present
2) All compounds are molecules, but not all molecules are compounds. This statement is...
A
True
B
C
D
False
3) Which term refers to the molecules that are present before a chemical reaction occurs?
A
Compound
B
Products
C
Reactants
D
Synthetics
4) Which of the following pairs is most likely to form an ionic bond?
A
S and O
B
N and O
C
Ca and Cl
D
H and H
5) Which of the following pairs will create the strongest atomic bond?
A
Ca and Cl
B
O and O
C
H and H
D
Li and F
6) How many valence electrons are there on an Oxygen atom?
A
7
B
1
C
6
D
2
7) A chemical reaction starts with 2 H2 and O2. According to the Law of Conservation of Mass, how many hydrogen and oxygen should be in the product?
A
4 Hydrogen and 2 Oxygen
B
2 Hydrogen and 4 Oxygen
C
4 Hydrogen and 4 Oxygen
D
2 Hydrogen and 2 Oxygen
8) What coefficients would balance this equation? ___ C + ___ O2 --> ___ CO
A
2, 1, 2
B
1, 2, 1
C
1, 1, 2
D
1, 1, 1
9) What coefficients would balance this equation? ___Fe + ___ H2O --> ___ H2 + ___ Fe3O4
A
3, 2, 2, 1
B
3, 1, 1, 1
C
3, 4, 4, 1
D
1, 2, 1, 1
10) What coefficients would balance this equation? ___ C12H26 + ___ O2 --> ___ CO2 + ___ H2O
A
3, 72, 36, 39
B
1, 50, 12, 13
C
1, 4, 12, 13
D
2, 37, 24, 26
*select an answer for all questions
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