Matching
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Match each item with the correct statement below. a. | oxidation number | c. | oxidizing agent | b. | half-reaction | d. | reducing agent |
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1.
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substance that accepts electrons
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2.
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substance that donates electrons
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3.
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integer related to the number of electrons under an atom's control
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4.
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reaction showing either the reduction or the oxidation reaction
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Match each item with the correct statement below. a. | Choose coefficients to make the change in oxidation number equal to
0. | b. | Make the electron changes of both half-reactions equal. | c. | Assign oxidation
numbers to all the atoms. | d. | Write the equation showing ions
separately. |
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5.
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the first step in balancing a redox reaction by the oxidation-number-change
method
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6.
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the next-to-the-last step in balancing a redox reaction by the
oxidation-number-change method
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7.
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the first step in balancing a redox reaction by the half-reaction
method
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8.
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the next-to-the-last step in balancing a redox reaction by the half-reaction
method
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Multiple Choice Identify the
choice that best completes the statement or answers the question.
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9.
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If an atom is reduced in a redox reaction, what must happen to another atom in
the system?
a. | It must be oxidized. | b. | It must be reduced. | c. | It must be
neutralized. | d. | Nothing needs to happen to another atom in the
system. |
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10.
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What is another name for an oxidation-reduction reaction?
a. | O-reaction | c. | redox reaction | b. | R-reaction | d. | oxred reaction |
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11.
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When iron oxide becomes iron, what type of reaction occurs?
a. | oxidation | c. | neutralization | b. | reduction | d. | combination |
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12.
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In which of the following types of reaction are electrons gained?
a. | decomposition | c. | neutralization | b. | oxidation | d. | reduction |
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13.
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Oxidation is ____.
a. | a loss of oxygen | c. | a loss of electrons | b. | a gain of electrons | d. | a gain of
hydrogen |
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14.
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What are transferred in an oxidation-reduction reaction?
a. | protons | c. | electrons | b. | ions | d. | atoms |
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15.
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In the reaction of sodium with oxygen, which atom is reduced?
a. | sodium | c. | both a and b | b. | oxygen | d. | neither a nor b |
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16.
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In the reaction of sodium with oxygen, which atom is the reducing agent?
a. | sodium | c. | both a and b | b. | oxygen | d. | neither a nor b |
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17.
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In the reaction of calcium with chlorine, which atom is the oxidizing
agent?
a. | calcium | c. | both a and b | b. | chlorine | d. | neither a nor b |
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18.
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In the reaction of calcium with chlorine, which atom is oxidized?
a. | calcium | c. | both a and b | b. | chlorine | d. | neither a nor b |
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19.
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In the reaction of hydrogen with iodine, which atom is oxidized?
a. | hydrogen | c. | both a and b | b. | iodine | d. | neither a nor b |
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20.
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In the reaction of hydrogen with iodine, which atom is the reducing
agent?
a. | hydrogen | c. | both a and b | b. | iodine | d. | neither a nor b |
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21.
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Cu ® Cu + 2 e- The equation above represents the type of reaction called ____.
a. | redox | c. | reduction | b. | hydrolysis | d. | oxidation |
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22.
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Which type of reaction does Sn ®
Sn represent?
a. | oxidation | c. | hydrolysis | b. | reduction | d. | none of the
above |
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23.
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What is the reducing agent in the following reaction? 2Na + 2H O ® 2NaOH + H
a. | Na | c. | NaOH | b. | HO | d. | H |
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24.
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What is the reducing agent in the following reaction? 2Na + S ® Na S
a. | Na | c. | NaS | b. | S | d. | Na |
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25.
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What is the oxidizing agent in the following reaction? CH +
2O CO + H O
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26.
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Which statement is true about the following reaction? S + Cl SCl (Hint: Chlorine is the more
electronegative element.)
a. | Sulfur is reduced to SCl. | c. | Chlorine is oxidized to SCl. | b. | Chlorine is reduced to SCl. | d. | Sulfur is the oxidizing
agent. |
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27.
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What is the oxidizing agent in the following reaction? I +
MnO I + MnO
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28.
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Why is oxygen reduced in the reaction of hydrogen with oxygen to make
water?
a. | Oxygen pulls electrons toward itself. | b. | Oxygen pushes electrons toward the
hydrogens. | c. | Oxygen absorbs a proton. | d. | Oxygen releases a
proton. |
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29.
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The oxidation number of magnesium in magnesium chloride is ____.
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30.
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The oxidation number of hydrogen when it is in a compound other than a hydride
is ____.
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31.
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The oxidation number of bromime in bromime gas is ____.
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32.
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What is the oxidation number for each atom in NH Cl?
a. | N = +3, H = –4, Cl = +1 | c. | N = +3, H = +1, Cl =
–1 | b. | N = –3, H = +1, Cl = –1 | d. | N = –3, H = –1, Cl =
+1 |
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33.
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What is defined as the charge an atom would have in a compound if its bonding
electrons were assigned to the more electronegative atom?
a. | reduction number | c. | valence | b. | oxidation number | d. | electropositivity |
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34.
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The oxidation number of sulfur in each of the following is +6 EXCEPT for
____.
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35.
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In which of the following compounds is the oxidation number of nitrogen
different from the other three?
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36.
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Identify the atom that increases in oxidation number in the following redox
reaction. 2MnO + 2K CO + O 2KMnO + 2CO
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37.
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Which atom has a change in oxidation number of –3 in the following redox
reaction? K Cr O + H O + S
KOH + Cr O +
SO
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38.
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In the following unbalanced reaction, which atom is reduced? H O +
Cl + SO HCl + H SO
a. | hydrogen | c. | chlorine | b. | oxygen | d. | sulfur |
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39.
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In the following unbalanced reaction, which atom is oxidized? HNO + HBr NO + Br + H O
a. | hydrogen | c. | oxygen | b. | nitrogen | d. | bromine |
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40.
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Which element decreases its oxidation number in the following
reaction? BiCl + Na SO 2NaCl + BiSO
a. | bismuth | b. | chlorine | c. | oxygen | d. | No element decreases its oxidation
number. |
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41.
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Which element increases its oxidation number in the following reaction? 3KOH
+ H PO K PO + 3H O
a. | potassium | b. | hydrogen | c. | oxygen | d. | No element increases its oxidation
number. |
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42.
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Which element decreases its oxidation number in the following reaction? I + 2KCl 2KI + Cl
a. | iodine | b. | potassium | c. | chlorine | d. | No element decreases its oxidation
number. |
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43.
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Which element increases its oxidation number in the following reaction? 2Na +
2H O 2NaOH + H
a. | sodium | b. | hydrogen | c. | oxygen | d. | No element increases its oxidation
number. |
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44.
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Which of the following reactions is a redox reaction?
a. | acid-base | c. | combustion | b. | double-replacement | d. | all of the
above |
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Numeric Response
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45.
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What is the oxidation number of magnesium in magnesium iodide?
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46.
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What is the sum of the oxidation numbers in lithium carbonate?
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47.
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What is the sum of the oxidation numbers in calcium carbonate?
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48.
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What is the sum of the oxidation numbers in the chlorate ion?
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