Which of the following chemical reactions is an oxidation-reduction reaction?
Question description
Which of the following chemical reactions is an oxidation-reduction reaction? CuSO4 + BaCl2 yields BaSO4 + CuCl2 AgNO3 + NaCl yields AgCl + NaNO3 Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3 Zn + H2SO4 yields ZnSO4 + H2
Which of the following describes an element that is oxidized in a reaction? (2 points)
It gains electrons during a reaction.
It has a decrease in its oxidation number.
Al Al3+ + 3e−
F2 + 2e− 2 F−
5.
(07.05 LC)
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Which of the following describes an element that is reduced in a reaction? (2 points)
It acts in the reactant that is the reducing agent.
It has a decrease in its oxidation number.
Cd Cd2+ + 2e−
Zn + Cu2+ Zn2+ + Cu
6.
(07.05 MC)
Consider the following reaction:
Cl2 + 2NaBr 2NaCl + Br2
Which element is oxidized and which is reduced in the reaction? (2 points)
Br is reduced and Na is oxidized.
Cl is reduced and Br is oxidized.
Cl is reduced and Na is oxidized.
Na is reduced and Br is oxidized.
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