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Multiple Choice
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1

For Questions 1 & 2: consider the chemical equation: CH4 + 2 O2 → CO2 + 2 H2O

The number of atoms on each side of the equation is
A)5.
B)6.
C)7.
D)9.
2

The total mass of products in the methane reaction above is
A)80 u.
B)64 u.
C)62 u.
D)48 u.
3

The formula weight of methane, CH4 is
A)13 u.
B)16 u.
C)52 u.
D)none of these.
4

The empirical formula of C4H8 is
A)CH.
B)CH2.
C)C4H8.
D)C2H4.
5

The reaction 2 Mg + O2 → 2 MgO is an example of
A)decomposition.
B)combination.
C)replacement.
D)ion exchange.
6

When the equation __Li + __O2 → __Li2O is correctly balanced, the sum of the coefficients is
A)3.
B)5.
C)7.
D)12.
7

The reaction: 2 NaI + Cl2 → 2 NaCl + I2 is an example of
A)decomposition.
B)combination.
C)replacement.
D)ion exchange.
8

The reaction: potassium chlorate Δ→ potassium chloride and oxygen gas is an example of
A)decomposition.
B)combination.
C)replacement.
D)ion exchange.
9

The number of oxygen atoms in Al2(SO4)3 is
A)3.
B)4.
C)7.
D)12.
10

The equation 2 C2H5OH + __O2 → 4 CO2 + 6 H2O is balanced by making the coefficient of oxygen
A)14.
B)12.
C)7.
D)6.





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