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.


i am unsure of the above answer for the two question, can somebody please help me verify if they are correct

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.

I don't agree with your answer to 23 either. Forgive me for being so direct but your answer appears to me that you don't know the answer so you put in a lot of words, talked around the answer and about the answer, but you never answered the question. If you really do know what you are talking about then I think the answer should be modified to a direct answer. If I wanted to answer this question I would look at the units for a first order reaction (easy enough to figure out), then look at a reaction that is first order with two reactants (and second order overall) and note the relationship, if any.

For Question 22, your answer is partially correct. The rate of a chemical reaction typically depends on factors such as temperature, concentration, surface area, and the presence of catalysts. While enthalpy, represented by ΔH, does play a role in determining the rate of a reaction, it is not the only factor. Enthalpy represents the heat exchange in a reaction, which can influence the reaction rate but is not the sole determinant. Therefore, the correct answer would be that the rate of a chemical reaction depends on various factors, including enthalpy.

For Question 23, your answer is not entirely clear. The rate constant, represented by k, is related to the overall reaction order, but the specific relationship between the units of k and the reaction order depends on the reaction kinetics. In general, the units of k are determined by the reaction order. For example, if the overall reaction order is 1, the units of k would be in M/s (Molarity per second); if the overall reaction order is 2, the units of k would be in M^(-1)s^(-1) (inverse molarity per second). The specific relationship between the units of k and the reaction order can be determined from the rate law equation.