Separating Mixtures

Question 1

Physical change

Answer 1

No change in the particle arrangement and energy, easy to reverse eg. mixing water and salt.

Question 2

Chemical change

Answer 2

a new substance is formed. Not easy to reverse. Chemical reaction like iron nails rusting.

Question 3

During a chemical reaction

Answer 3

The atoms rearrange to form a new substance. Might be seen by colour change, temperature change, light being emitted or bubbles

Question 4

The law of conservation of mass

Answer 4

states that matter cannot be created or destroyed but can change from one form to another.
In both physical and chemical change

Question 5

Filtration

Answer 5

Used to separate small insoluble solids (do not dissolve in a liquid) from a liquid using by using a filter paper and a funnel to trap solids

Question 6

Evaporation

Answer 6

Used to separate soluble liquids from a solution by evaporating off the liquid to leave the solids e.g salt water pg 169

Question 7

Distillation

Answer 7

Used to separate with different boiling points such as alcohol (boils at 78) and water boils at (100) . Also used to separate a soluble solid from a liquid (e.g seawater) to give a pure sample of each (pg.169)

Question 8

Insoluble

Answer 8

Does not dissolve in liquid

Question 9

Soluble

Answer 9

Dissolves in liquid