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Well, rule some out. Which ones do you know aren't? That is, if you do know any of them aren't.
Well sand is obviously not..right?
It's fine, and no it isn't. Anything else?
What do they mean by pure substance here?
I mean like how can I know?
What they mean by Pure substance, is something that can't be split into different things. An example is..|dw:1350413254215:dw| The tree, it has leafs, wood, and so on.
Oh wait! I read something about pure substance that it may be compound or element
This is confusing >.<
Well.. Let me think of how to put it.
They're all pure except one?
Lets say, you have milk, alright? If you add cereal to it, it's no longer just milk. You're turning adding onto it. A pure substance is something that is only of one thing. Like..Say you have oxygen. Oxygen isn't a mixture of gasses, it's simply Oxygen. Nothing else but. That's a pure substance.
No, No. All of them aren't pure, besides one.
Gold isn't pure?
water isn't pure?
sand isn't pure?
Okay lets take your example you can add hydrogen to oxygen and it's no longer just oxygen.. right?
Water isn't pure, it has other things in it such as sand and chlorine. Minerals, all in all.
But, what is gold?
Ahhh! I get it! -I think- So pure means that it's only like one thing or element that can't be broken down more
Gold is an element.. so it's pure?
Gold is only gold.
Yay! Thanksss LOOAADSSSSSSS :D