what is pure substances?

Question

what is pure substances??..

Answer 1

Pure means the lack of impurities. There are no flies in pure soup! Pure gold is 24k with zero silver, copper, etc. alloys present. However, pure air is a mixture of gases (nitrogen, oxygen, carbon dioxide and traces of rare gases) because that is exactly what is found in nature. And this is a pure guess.

Answer 2

A pure substance has a fixed boiling and melting/freezing point at a particular pressure. For example, pure water boils at 100C and freezes at 0C at atmospheric pressure. These temperatures will vary slightly if the pressure changes. Also, pure substances have sharp cooling curves. Meaning, you can find out the boiling and melting/freezing point by looking at the curve/graph. Impure substances like wav have varying boiling and melting/freezing points

Answer 3

A single substance.
I.E. pure salt is 100% sodium chloride with not a single atom of anything else. In practice this is impossible but you can get as close as you want to purity.

Answer 4

What ARE pure substances?

Answer 5

Pure substances are also known as elements. They are materials which only contain atoms of the same type. Examples are : Iron,copper,gold,silver,carbon,silicon,oxygen... Other materials,such as water,steel,brass,glass,air are compounds. They contain atoms of different types which have combined to form molecules.

Answer 6

every time i find a PURE substance she says piiss off!!!
pure is something not tainted by man, not much left really!!

Answer 7

pure substances is the subtances with

Answer 8

gold

Answer 9

air

Answer 10

Why did you ask the question twice?