Chemistry The rate of reaction

1. 70 - 30 = 40°C
so the rx rate increases 2*2*2*2 = 16 times.

2.

Zn(s) + 2 HCl(aq) = ZnCl2(aq) + H2(g)

HCl + H2O = H3O+ + Cl-

so when you add water to the rx mixture, the dissolving rate of HCl will be increased. As a result, the dissolving rate of zinc granules will be decreased(e.g. the time will be longer)

So, the answer is, it is correct.


Any question ?




2011-09-26 21:27:05 補充：
To 知識就是力量 (
hmm...
You are saying that when adding water :
HCl ---> H+ + Cl-,[H+] decreased,
but doesn' t "further dilution of the acid" means [HCl] decreased ?

2011-09-26 21:29:33 補充：
if so, shouldn' t we focus on : Zn(s) + 2 HCl(aq) = ZnCl2(aq) + H2(g)
[HCl] decreased, so still the rx time for dissolving zinc granule will be increased.

Please correct me if I have any wrong concept...

2011-09-26 21:30:28 補充：
Please check out "意見"

I don't agree with 愛力揚 in Q2.
You state that increasing amount of water will increase the rate of reaction. But don't increased amount of water means a further dilution of the acid? The concentration of H+ thus decreases, rate of reaction should be lowered instead, doesn't it?