What is the difference between mixture and pure substance? give an example of each.?

Answer 1

There is actually a few differences. Firstly, a pure substance can be an element or compound. A compound is a subtance where the elements made up of it are bonded by chemical bonds, either ionic or covalent bond. A mixture may consist of a combination of elements or compound, where there is no forces of attraction between them.

Pure substance: Carbon dioxide, water, sodium chloride.
Mixture: Alloy like brass (zinc & copper), chalky water (calcium carbonate and water).

Pure substance has fixed melting and boiling point whereas mixture has a range of melting and boiling point due to presence of impurities.

Pure substance has fixed composition by mass but mixture has varying degree of composition.

Pure substance cannot be separated into other substance by physical means like distillation, filtration unlike a mixture. Pure substance has to be separated by chemical means like electrolysis to it's constituent parts.

Answer 2

Pure Substance Example

Answer 3

A pure substance: O2
A mixture: CO2
A pure substance contains only one element whereas a mixture contains more than one element either hetero or homogeneously.

Answer 4

ok a mixture is physically combined and can only be separated by physical means lets say like muddy water....if you boil it you can separate water and dirt the water will evaporate and it will leave a mess in your pan
a pure substance is something that can only be separated by chemical means like silver nitrate.....if you add a little ball of copper to a silver nitrate solution....you can get the silver out of the silver nitrate and the copper will react with it and the copper will turn into silver well silver shavings and that NEEDS a chemical reaction to be separated...(great 9th grade sience project by the way)

Answer 5

a pure substance is unchanged- a mixture has another element added to it.
O2- pure
H2O- mixture

see the differece?
not bad for 5th grade, huh?