Question

How can you tell whether something is aqueous, solid, or a gas?

Answer 1

Aqueous/solid you can tell by solubility rules
Gases can be predicted by boiling point of the compounds

Answer 2

@Sheng I have the solubility rules paper, but I don't understand how to use it. Do you mind helping me?

Answer 3

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&sqi=2&ved=0CCUQFjAA&url=http%3A%2F%2Fwww.tea.state.tx.us%2FWorkArea%2Flinkit.aspx%3FLinkIdentifier%3Did%26ItemID%3D2147496781%26libID%3D2147496778&ei=fnx7UPjZOaei2wXFw4DoBA&usg=AFQjCNGdCAEBrs7iWMLbwDCZKN75Q1vWSQ&sig2=uXCucCpkQbI7Gtyt7MWgzg

Answer 4

^^ that is the chart.

Answer 5

read my mind

Answer 6

but anyways, you see the first part says soluble compounds contain
that means these ions below are more likely to be mostly soluble (aq) and that's why they are classified here, exceptions to this (which makes them solid) are listed on the right columns. For example...if I had a compound AgBr and I'm trying to predict the solubility. I would search Br- on the chart and see that Ag is an exception to the solubility rules. Thus AgBr is a solid (s).
The 2nd part of the chart is just a different type of representation, these ions are mainly insoluble, and the exceptions in the right columns are when these ions are soluble.
For example...if I had a compound Ca(OH)2, I look up OH-, and see that Ca2+ is an exception, thus the compound is (aq).

Answer 7

So say it was FeBr, it would be a aq solution? @Sheng

Answer 8

Yep, but remember Fe being a transitional element has a few possible charges
which is why you need to specific its charge in parenthesis
would either be Fe(II)Br2 or...Fe(III)Br3

Answer 9

What about the insoluble compounds section? @Sheng

Answer 10

It's the same except this time the exceptions makes the compound soluble

Answer 11

Can you give me an example? @Sheng

Answer 12

i did Ca(OH)2 (look above) xD

Answer 13

Oh haha :P Okay, so what if it was P(OH)? Then would it be a gas..? @Sheng

Answer 14

again, be careful with your oxidation number, phosphorous usually has a +5, +3, or -3 charge, so here lets just go with +5
P(OH)5, and solubility rules can never predict whether it's a gas, only for (aq) or (s)

Answer 15

Oh, so would this be a solid? @Sheng

Answer 16

yep

Answer 17

Are they always on the chart? Like, what if you had C+O=> 2CO?

Answer 18

@Sheng

Answer 19

I meant 2C+O2=> 2CO @Sheng

Answer 20

you mean, C+O2 --> CO2
and no not everything will be on the chart, the chart is only for predicting compounds that deionizes
here you are given no compounds, but rather a synthesis reaction involving carbon and oxygen

Answer 21

So it's just a gas?

Answer 22

@Sheng

Answer 23

yes

Answer 24

Okay, so what if you have Na3N? Would it be aqueous because it's a nonmetal and a metal? @Sheng

Answer 25

usually when a non-metal bonds with a metal it produces a salt, so this would be most likely (aq), but I dont think they'll ask you to predict the phases in this type of problems