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Given the reaction: Ca(s) + Cu^2+(aq) --> Ca^2+(aq) + Cu(s). What is the correct reduction half-reaction?
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
Br2^0 + 2e- --> 2Br-
Cu^2+(aq) + 2e- --> Cu(s)
Two electrons are lost.
Fe^2+ + 2e- --> Fe^0
Br2 +Hg --> Hg^2+ + 2Br-
Na2S
Na
In which compound does sulfur have an oxidation number of -2?
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
Br2^0 + 2e- --> 2Br-
Cu^2+(aq) + 2e- --> Cu(s)
Two electrons are lost.
Fe^2+ + 2e- --> Fe^0
Br2 +Hg --> Hg^2+ + 2Br-
Na2S
Na
Given the reaction: 2Na +2H2O --> 2Na+ + 2OH- + H2. which substance is oxidized?
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
Br2^0 + 2e- --> 2Br-
Cu^2+(aq) + 2e- --> Cu(s)
Two electrons are lost.
Fe^2+ + 2e- --> Fe^0
Br2 +Hg --> Hg^2+ + 2Br-
Na2S
Na
Which redox equation is correctly balanced?
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
Br2^0 + 2e- --> 2Br-
Cu^2+(aq) + 2e- --> Cu(s)
Two electrons are lost.
Fe^2+ + 2e- --> Fe^0
Br2 +Hg --> Hg^2+ + 2Br-
Na2S
Na
Which half-reaction correctly represents reduction?
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
Br2^0 + 2e- --> 2Br-
Cu^2+(aq) + 2e- --> Cu(s)
Two electrons are lost.
Fe^2+ + 2e- --> Fe^0
Br2 +Hg --> Hg^2+ + 2Br-
Na2S
Na
Which change occures when an Sn^2+ ion is oxidized?
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
Br2^0 + 2e- --> 2Br-
Cu^2+(aq) + 2e- --> Cu(s)
Two electrons are lost.
Fe^2+ + 2e- --> Fe^0
Br2 +Hg --> Hg^2+ + 2Br-
Na2S
Na
Which half-reaction correctly represents a reduction reaction?
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
Br2^0 + 2e- --> 2Br-
Cu^2+(aq) + 2e- --> Cu(s)
Two electrons are lost.
Fe^2+ + 2e- --> Fe^0
Br2 +Hg --> Hg^2+ + 2Br-
Na2S
Na
Which equation represents a redox reaction?
Cu + 2Ag+ + 2NO3^- --> 2Ag + Cu^2+ + 2NO3^-
Br2^0 + 2e- --> 2Br-
Cu^2+(aq) + 2e- --> Cu(s)
Two electrons are lost.
Fe^2+ + 2e- --> Fe^0
Br2 +Hg --> Hg^2+ + 2Br-
Na2S
Na
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