Elements, Compounds And Mixtures

Question 1

Mixture

Answer 1

Mixtures are made of 2 or more substances (elements or compounds) that haven’t been chemically combined. Mixtures can be separated. Their chemical properties don’t change because they have been mixed with another substance.

Question 2

Compound

Answer 2

Atoms of different elements can be combined together to create compounds. Compounds have formulae that are made by combining the chemical symbols of the elements that combine to make them.

Question 3

Pure

Answer 3

Single element of compound with nothing else. Purity can be tested by working out melting and boiling points.

Question 4

All ways of separating mixtures

Answer 4

1. Crystallisation
2. Fractional distillation
3. Simple distillation
4. Chromatography
5. Filtration

Question 5

Rf value formula

Answer 5

Distance traveled by substance / distance traveled by solvent front

Question 6

Solute

Answer 6

A dissolved substance

Question 7

Solvent

Answer 7

A usually liquid substance capable of dissolving other substances.

Question 8

When an acid and alkali react

Answer 8

Neutralisation