Question

Air contains about 78% nitrogen and 21% oxygen. Based on this information, one can conclude that air
A
is a pure substance.

B
is a mixture of at least two gases.

C
consists of different states of matter.

D
consists of components that are chemically joined.

Answer 1

B?

Answer 2

@Allison

Answer 3

Hello :)
Process of elimination!
I will eliminate C, now you eliminate another answer you know it's not true.

Answer 4

okay, thanks

Answer 5

a

Answer 6

No, because it's a homogeneous, a mixture of things

Answer 7

So not A, nor C

Answer 8

so b because mixtures aren't chemically combined?

Answer 9

thank you

Answer 10

I think so too (: Good luck!

Answer 11

thnxs

Answer 12

You're welcome!