chemistry

a) Describe how to determine if a reaction will be thermodynamically favorable.

b) Describe what happens to the Gibbs Free Energy term when a chemical reaction is reversed.

c) Describe how coupling reactions are used to drive an unfavorable chemical reaction.

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  1. I don't believe you don't know these. I shall be happy to critique your thoughts.

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  2. a. When a reaction thermodynamically favorable, it will be a spontaneous reaction as well as release energy. Gibbs Free energy is the amount of energy needed for a reaction to take place. If the Gibbs Free energy is negative that means that the reaction does not need an impute of energy making it thermodynamically favorable.

    What to you think of this answer if it is supposed to by 2-3 sentences.

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  3. b. Gibbs Free Energy can either be negative when a chemical reaction is spontaneous or positive when a chemical reaction is nonspontaneous. When a chemical reaction is reversed, it can either go from spontaneous to nonspontaneous or the other way around. This means that the Gibbs Free Energy would either change from negative to positive or positive to negative.

    What to you think of this answer if it is supposed to by 2-3 sentences.

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  4. Please help me with the last one

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  5. For 1, I think the requirement to write that much is overkill but I don't think you've said anything wrong. Make sure you clean up the typos and grammar. Perhaps you should add something about Ssysten + Ssurroundings = + the reaction will be favorable (spontaneous). Frankly I think all you need is this.
    A reaction is thermodynamically favorable if delta G is negative or if Suniverse is positive (or spell it out that is the sum of Ssystem and Ssurroundings is positive) but then that isn't 2 or 3 sentences.

    For #3 I really don't know what kind of coupling they are talking about or where it is in a synthesis. If you have an example and can give it to me I can probably figure it out. I suspect it is a Le Chatelier's principle thing. If the reaction is
    A + B ==> C and the reactions doesn't proceed easily, one can add a reagent that will react with C such that the the combination is a ppt or a gas, that will drive the reaction to the right.

    b. I don't know the sentence requirement for this one but I think all you need is
    When a reaction is reversed the sign of delta G changes.

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