anonymous
  • anonymous
Which of the following represents a compound? H2O, O2, C20, or H2?
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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aaronq
  • aaronq
do you know the difference between a molecule and a compound?
anonymous
  • anonymous
Not sure...
aaronq
  • aaronq
we'll a molecule is a specific unit of atoms covalently bound to one another. Out of the ones you posted, water, oxygen gas and hydrogen gas are all molecules. A compound is a bit harder to define, because it can be a molecule as well as ionic solids.

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anonymous
  • anonymous
So, you believe non of the above are compounds, because H2o (water), O2 (oxygen), C2o (gas), and H2 (hydrogen) are all molecules?
aaronq
  • aaronq
we'll i think \(C_{20}\) is compound because it's a pure substance AND because it doesn't have a defined structure.
anonymous
  • anonymous
Okay, thank you! I will check in with my teacher and let you know.
aaronq
  • aaronq
okay, good luck!
anonymous
  • anonymous
I actually have another question- Air contains mostly nitrogen (78%) and oxygen (21%), It also contains other gases, including carbon dioxide and helium, and various pollutants (both gases and solids). I want to know why air is a mixture, whether it is homogeneous or heterogeneous, and how it may be separated into it's components.
anonymous
  • anonymous
I believe it is heterogeneous because the components of air are unevenly distributed.
aaronq
  • aaronq
why do you propose that it's not distributed evenly?
anonymous
  • anonymous
Because nitrogen is 78% and oxygen is 21%
anonymous
  • anonymous
Are those not it's components?
aaronq
  • aaronq
yeah but it's evenly distributed. It's like there's patches of nitrogen and no oxygen present.
aaronq
  • aaronq
it's not like***
anonymous
  • anonymous
Oh, okay. So how can it be separated into it's components?
aaronq
  • aaronq
so it is a homogenous mixture, just to be clear. Um you can cool the mixture in a controlled fashion and since the components have different boiling points they'll condense at different temperatures.
anonymous
  • anonymous
I actually need to answer why air is a mixture. Not how I know
anonymous
  • anonymous
Is air a mixture because it has several components?
aaronq
  • aaronq
yes, and it's homogeneous because the components are uniformly distributed.
anonymous
  • anonymous
Okay. Thank you!
aaronq
  • aaronq
you're welcome
aaronq
  • aaronq
apparently (news to me), a compound is made from more than 2 elements, so the answer would've been water.
anonymous
  • anonymous
It is okay :) I did get the answer wrong but it is fine. Now I know for next time :)

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