Elements and compounds

Question 1

Pure substance

Answer 1

A single substance that isn’t mixed with anything

Question 2

Melting and boiling points as proof of purity

Answer 2

A pure substance has a fixed melting and boiling point. They are unique and no other substance has them.

Impurities lower the melting point of a pure substance causing it to melt over a range of temperatures. They increase the boiling point which causes the substance to boil over a temperature rand

Question 3

Chromatography as proof of purity

Answer 3

The substance is placed in a container containing a solution. If it is separated into various components it is not pure

Question 4

Chromatography

Answer 4

The process where substances are divided into various components

Question 5

Element

Answer 5

A pure substance that cannot be broken into simpler substances by chemical methods

Question 6

Compound

Answer 6

A substance that consists of two or more different atoms that are chemically bonded into a single substance