pure substance, propanone
A pure substance is classified by having a definite and constant composition. The substance can be either an element or a compound, but what makes the substance pure, is that it does not vary.
I thought it was pure substance. But i recently took a Science Test of these subject(i'm also in 8th grade) and it was the same question...EXACTLY! I put down Pure substance as well but appearantly the answer was "All of the Above" which included A.Pure Substance B.Compound C.Element ... so as long as you can prove it was only pure substance( This was for extra credit to get points back on the test for my teacher) You got the points. In my opinion a Pure Substance is the substance in which there is only one type of particle. I hoped this helped :)
Mixture, because it is mixed with all sorts of chemicals, such as smog, and or pollen.Mixture is NOT a pure substance, because to be a pure substance, it can't be mixed with anything.
oxygen is an example of a pure substance because a pure substance is made up of one kind of matter and it cannot be broken down into smaller parts.
Medicine made by mixing a substance is glycerol
Glycerol is singular. The noun glycerol is an uncountable (mass) noun, a word for a substance.
pure substance, propanone
no not at all, glycerol is a pure compound C3H5(OH)3 gluten is something completely different
it is a pure substance.... not
Pure substance
A pure substance is the same throughout. When a substance is 100% something it is pure.
Methane is a pure substance.
Helium is pure as it is on the periodic table.
Glycerin is another name for glycerol, which is a pure compound, not a mixture. However, if you leave pure glycerol exposed to the air, it will attract moisture, so an opened bottle labeled "glycerin" may in fact contain a mixture of glycerol and water (up to about 20% water).
silicon is a pure substance because it is an element and as we know an element is a pure substance
Silicon is an element. Its symbol is Si.