Chemistry reaction help?

[fa®m]

what are the results of these reactions:
AgNO3 + Cu --------> ?
HCl + 2CaCO3 -------> ?
CaO + H2O --------> ?
HCl + Zn --------> ?

and what kind of reaction is NHCO3. I though decomposition, but I don't understand how i'd solve that if decomposition were correct...(or in general...)

thanks!

[Dr Dave P]

2AgNO3 + Cu --> Cu(NO3)2(aq) + 2Ag Ecell = + 1.26 V

2HCl(aq) + CaCO3(s) --> CaCl2(aq) + CO2(g) + H2O(l)

CaO(s) + H2O(l) --> Ca(OH)2(aq)

2HCl(aq) + Zn(s) --> ZnCl2(aq) + H2(g)

With the CaCO3 it's through the formation of H2CO3

2HCl(aq) + CaCO3(s) --> H2CO3(aq) + CaCl2(aq)

The H2CO3 is unstable and decomposes to CO2 and water

H2CO3(aq) --> CO2(g) + H2O(l)