# Chemistry - enthalpy and rate constant (check)

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22. The rate of a chemical reaction is dependent on its ΔH. Do you agree or disagree with this statement? Briefly justify your answer.
I agree with the above statement, enthalpy is defined as the internal energy of the reactants and products therefore the chemical reaction will depend on the breaking and forming of the bonds which will then be either exothermic or endothermic.
23. What is the relationship between the units of the rate constant, k, and the overall reaction order?
The relationship between the units of the rate constant, k, and the overall reaction order is that it will determine the unit of k.

• Chemistry - enthalpy and rate constant (check) -

I don't agree with 22. DH is one factor that determines the spontaneity of the reaction (DG = DH -TDS) but it doesn't tell you anything about the rate. For example, the stable form of carbon is graphite. So diamonds will spontaneously degrade to graphite.(C graphite has DH = 0; C diamond has DH = 1.9 kJ/mol) However, the reaction is so slow that diamonds can be bought and sold as jewelry with no fear of them degrading significantly over many decades.

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