Which of these materials is a mixture
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Which of these materials is a mixture

[From: ] [author: ] [Date: 12-04-05] [Hit: ]
Thank you.-The Air (as in what we breathe) is a mixture because its composed of Nitrogen(78%)and Oxygen(20%) and the other 2% is argon and other gases.......
a) water
b) air
c) methane
d) magnesium
Please help, don't just tell me the answer but explain why! Thank you so much!

-
Hi Heather!

a) water is not a mixture since it is a chemical substance with the chemical formula H2O

b) air is a mixture of gases and it is mainly composed of nitrogen, oxygen, carbon dioxide and argon

c) methane is not a mixture since it is a chemical substance with the chemical formula CH4

d) magnesium is not a mixture since it is a chemical element (metal) with the chemical formula Mg

Bye from Italy,

C6H6

My Signature:

Asking is legitimate and choosing the Best Answer is good manners. Thank you.

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The Air (as in what we breathe) is a mixture because it's composed of Nitrogen(78%) and Oxygen(20%) and the other 2% is argon and other gases.
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