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Increasing the surface area will increase the reaction rate in:

1. N2(g) + O2(g) -> 2NO(g)
2. 2Mg(s) + O2(g) -> 2MgO(s)
3. CaCO3(s) + 2H+(aq) -> Ca2+(aq) + H2O(l) + CO2(g)

MY WORK: I think it is 2 & possibly 3. 1 is a homogeneous reaction but is 3 a heterogeneous reaction? gas and aqueous?

4 answers

I don't see a reaction 3a. I see a reaction 3 and that one heterogeneous. So is 2. I think the reaction rate will increase for BOTH 2 and 3 although I think 3 is less so than 2.
oh I mean, is 3 a heterogeneous reaction, not 3a. But a gas and an aqueous is a heterogeneous reaction correct?

Thanks!
Yes, 3 is a heterogeneous reaction. So is 2.
thank you very much!