Question

Which of the following is NOT a pure substance?
A. milk
B. oxygen
C. water
D. carbon dioxide
oxygen> because most of its polluted anyone agree>?

Answer 1

You bring up a very good argument, however, I believe that they are referring to the element itself. And by definition, a pure substance is one which has a constant composition. And oxygen is simply O\(_2\). Try again.

Answer 2

\(\sf \color{red}{NOTE}\): A mixture does not have definite physical and chemical properties, and combine in varying proportions.

Answer 3

well cold it be milk because people add things for us to be able to drink it because ik i couldn't drink milk straight from the cow. cuz of the foam and such.
but it could be carbon dioxide. ? because carbon is a pure substance and u add the dioxide makes it unpure correct?

Answer 4

i thinks its milk :)

Answer 5

Thanks i just cant decide :/ i really wanna no for sure before i retake this test so i can make 100. instead of a 90. because it will boost my over all grade.

Answer 6

WOW. You can retake tests? Lol. What dream school is this?!

Answer 7

Just think: what is the composition of milk?

If you can name at least 2 substances, then it's definitely a mixture.
If you can't, it's a pure substance.

e.g.1: air is a mixture, because it contains oxygen and nitrogen (2 substances at least)
e.g.2: sea water is a mixture, because it contains water and salt (2 substances at least)

Answer 8

its called James Madison / Ashworth edu.

Answer 9

milk and oxygen isnt pure substances i looked up milk and it gave me a list of componets in it & oxygen, you said it ur self contains nitrogen. so theres two good answers right there. so how do i choose. ?

Answer 10

Oxygen is a pure substance, I was talking about air which is a mixture.

Answer 11

Omg.

Answer 12

sorry thought oxygen and air was the same thing?

Answer 13

but thank yall for helping me understand this question, i appreciate it :)