# Predicting Chemical Equations

So I am having trouble with my chemistry.

What I don't understand is what to do when you are predicting the products of a chemical equation, and knowing what its physical state is

for example

Hg (NO3)2 + Na2S -->

I looked at my activity series and Sodium is more reactive than Mercury so I got

Na(NO3) + HgS

then balanced the equation would look like

Hg(NO3)2 + Na2S --> 2Na(NO3) + HgS

so is that right?

am I going in the right direction?

but how do you find out its physical state?

any help would be wonderful!

here is another

H2S04 + Ca(NO3)2 --> ?

 Evil dead Posts: 120, Reputation: 10 Junior Member #2 Feb 25, 2007, 12:49 PM
Hg(NO3)2 + 2NaS --> 2Na(NO3) + Hg2S

should be the correct balanced equation, though I did a fast job so it might be wrong. Hg is a transition metal so I'm a bit uncertain of the common valence.

But you are on the right track, predicting a chemical reaction is easy, most usually consist of acid base.
 lefty584 Posts: 2, Reputation: 1 New Member #3 Feb 25, 2007, 07:52 PM
Thanks!
 pwd77 Posts: 174, Reputation: 10 Junior Member #4 Feb 25, 2007, 08:21 PM
There are general physical properties of many chemicals which allow an educated guess, but often it is easiest to go to a reference source to find out the physical property of products in a reaction.

In this case soluble (aq = aqueous solution) reactants form insoluble (s = solid) products:

Hg(NO3)2 (aq) + Na2S (aq)-->2Na(NO3) (aq) + HgS (s)

H2S04 (aq)+ Ca(NO3)2 (aq)--> CaSO4(s) + H2NO3(aq)
 hot sexy gurl Posts: 5, Reputation: 1 New Member #5 Dec 9, 2007, 12:48 PM
help me to do this work balance molecular equations?

___ Fe + ____ S --> ___ FeS

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