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how many calories/joules is required to raise the temp of one gram of pure water by one degree celsius?

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QUESTION:A voltaic cell consisting of zinc and iron electrodes has this cell notation.Zn (s) | Zn2+ (aq) || Fe2+ (aq) | Fe (s)Identify the choice that correctly shows the reaction occurring at the anode as well as the overall reaction.ANSWER OPTIONS:[A] : The reaction occurring at the anode is Zn2+ (aq) + 2e− → Zn (s). The overall reaction is Zn (s) + Fe2+(aq) → Fe (s) + Zn2+ (aq).[B] : The reaction occurring at the anode is Fe2+ (aq) + 2e− → Fe (s). The overall reaction is Zn (s) + Fe2+(aq) → Fe (s) + Zn2+ (aq).[C] : The reaction occurring at the anode is Zn (s) → Zn2+ (aq) + 2e−. The overall reaction is Zn (s) + Fe2+(aq) → Fe (s) + Zn2+ (aq).[D] : The reaction occurring at the anode is Fe (s) → Fe2+ (aq) + 2e−. The overall reaction is Fe (s) + Zn2+(aq) → Zn (s) + Fe2+ (aq).

QUESTION:The surface of silver metal, Ag (s), became tarnished when it was exposed to oxygen, producing Ag2O. In Ag2O, the oxidation state of silver is +1. According to this information, silver metal was _____.ANSWER OPTIONS:[A] : Reduced[B] : Reduced and then oxidized[C] : Oxidized and then reduced[D] : Oxidized

QUESTION:A voltaic cell is constructed using an aluminum electrode (submerged in Al(NO3)3) and an iron electrode (submerged in Fe(NO3)2). Aluminum is a stronger reducing agent than iron. Which choice correctly shows the half-reaction occurring at the cathode?ANSWER OPTIONS:[A] : Al3+ (aq) + 3e− → Al (s)[B] : Fe (s) → Fe2+ (aq) + 2e−[C] : Al (s) → Al3+ (aq) + 3e−[D] : Fe2+ (aq) + 2e− → Fe (s)

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