kaplan subj chem 4

[hunterpostbacst]

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#7. which rxn will not proceed?
1) Li+CuCl2
2)Zn+NaNO3
3)CaCO3+HCl
4)K+H2O

I don't know what I should think first to attack this question.
1) should be proceeded because Li is +1 and Cl is -1
But, I am absolutely lost the rest of them.

 

[dentista123]

Most reactive element is in the bottom left corner. So if the "lonely" element or the cation is more reactive, it will replace the metal in the compound.
I believe it's 2 because Zn is less reactive than Na+ (in NaNO3)

 

[dentista123]

here's a reactivity series:

http://en.wikipedia.org/wiki/Reactivity_series

Also use common knowledge for these problems. If you see gold vs. Lithium..just think to yourself, how reactive is gold when we wear it as jewelry?

 

[hunterpostbacst]

Thanks a lot1!!