True/False
Indicate whether the
statement is true or false.
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1.
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In a chemical reaction, the
products are found on the left side of the arrow.
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Multiple
Choice
Identify the letter
of the choice that best completes the statement or answers the question.
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2.
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After the correct formula for a
reactant in an equation has been written, the
a. | subscripts are adjusted to balance
the equation. | b. | formula should not be changed. | c. | same formula must appear as the
product. | d. | symbols in the formula must not appear on the product side of the
equation. |
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3.
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What is the small whole number
that appears in front of a formula in a chemical equation?
a. | a
subscript | c. | a
ratio | b. | a superscript | d. | a coefficient |
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4.
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To balance a chemical equation,
it may be necessary to adjust the
a. | coefficients. | c. | formulas of the products. | b. | subscripts. | d. | number of products. |
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5.
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Which word equation represents
the reaction that produces water from hydrogen and oxygen?
a. | Water is produced from hydrogen and
oxygen. | b. | Hydrogen plus oxygen yields water. | c. | H2 + O2 → water. | d. | Water can be separated into hydrogen and
oxygen. |
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6.
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Which of the following is a
formula equation for the formation of carbon dioxide from carbon and oxygen?
a. | Carbon plus oxygen yields carbon
dioxide. | b. | C + O2 →
CO2 | c. | CO2 → C +
O2 | d. | 2C + O →
CO2 |
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7.
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In an equation, the symbol for
a substance in water solution is followed by
a. | (1). | c. | (aq). | b. | (g). | d. | (s). |
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8.
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What is the balanced equation
for the combustion of sulfur?
a. | S(s) +
O2(g) →
SO(g) | c. | 2S(s) +
3O2(g) →
SO3(s) | b. | S(s) + O2(g) → SO2(g) | d. | S(s) + 2O2(g) →
SO42–(aq) |
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9.
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The equation AX → A + X is the general equation for
a
a. | synthesis
reaction. | c. | combustion
reaction. | b. | decomposition reaction. | d. | single-replacement reaction. |
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10.
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The equation AX + BY
→ AY + BX is the general equation for
a
a. | synthesis
reaction. | c. | single-replacement
reaction. | b. | decomposition reaction. | d. | double-replacement reaction. |
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11.
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The equation A + X → AX is the general equation for
a(n)
a. | combustion
reaction. | c. | synthesis
reaction. | b. | ionic reaction. | d. | double-replacement reaction. |
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12.
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The reaction 2Mg(s) +
O2(g) → 2MgO(s)
is a
a. | synthesis
reaction. | c. | single-replacement
reaction. | b. | decomposition reaction. | d. | double-replacement reaction. |
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13.
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The reaction
2KClO3(s) →
2KCl(s) + 3O2(g) is a(n)
a. | synthesis
reaction. | c. | combustion
reaction. | b. | decomposition reaction. | d. | ionic reaction. |
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14.
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How many total atoms are in
3Na2SO4?
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15.
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How many total atoms are in
4Ca3(PO4)2?
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16.
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What are the correct
coefficients when this equation is balanced? Sb +
O2 → Sb4O6
a. | 1, 2,
10 | c. | 4, 3,
1 | b. | 4, 6,
1 | d. | 10, 5, 1 |
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17.
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Which are the product(s) of
this reaction? Mg + N2
→
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18.
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What are the correct
coefficients when this equation is balanced? K +
Br2 → KBr
a. | 1, 1, 1 | c. | 2, 1, 2 | b. | 1, 2, 1 | d. | 2, 1, 1 |
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19.
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Which type of chemical reaction
would this be classified as:
C3H8
+ O2 → CO2 + H2O
a. | synthesis | c. | combustion | b. | double replacement | d. | decomposition |
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20.
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Identify the type of chemical
reaction demonstrated by this equation:
KClO3
→
KCl + O2
a. | decomposition | c. | combustion | b. | synthesis | d. | single replacement |
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