which of the following is not a pure substance??

Question

1. milk
2.hydrogen
3.water
4.oxygen

Answer 1

Milk. Unless you live where I live then Water becomes an answer too. Just kidding. It's milk.

"Pure" in this context means all the molecules are the same stuff. Milk is actually a mixture of many different types of molecules. This is why most cartons of milk in the supermaket say homogenized, and this means they have mixed it really well so it seems like all the molecules are the same. If you leave a bottle of milk in a warm closet for a month, you will see that the fat has separated from the protein, among other things. It will smell, so don't try it. And if you do try, use a glass bottle, one that you can see through without opening it.

Answer 2

1

Answer 3

1. Milk

Milk is NOT a pure substance.
A pure substance is any material with a definite chemical composition, no matter where it comes from.
The make-up of milk CHANGES depending on the cow, it is NOT the sam everywhere.
However, no matter where you are, if you take a sample of hydrogen, water, or oxygen, it would be same ALWAYS. There would always be the same amount of oxygen and same amount of hydrogen in the water, and elements are always pure no matter what

Answer 4

Interesting question. On the surface of it, milk would seem to be the answer. Howver it depends on how one looks at "pure" and "substance". And as to if those can be contaminated.

I am going to say hydrogen.

Answer 5

milk is a combination of stuff...fats, water, enzymes etc.
However... Water is a combination of Hydrogen and Oxygen also, and therefore technically not a pure substance either

Answer 6

1. Milk, because it contains many different substances, while the others are all a pure compound or element.

Answer 7

Milk! Water is often H2O. Oxygen is often O. Carbon Dioxide is often CO2. Milk is a mix of water, calcium, supplementations, minerals, fat, protein, and a lot of alternative issues. Get it?

Answer 8

1.
milk

Answer 9

milk

Answer 10

milk