Chemistry - Separating Mixtures

Question 1

A mixture is?

Answer 1

Two or more different substances that are not chemically joined together.

Question 2

When a solid has dissolved in a liquid we end up with a ____?

Answer 2

Solution

Question 3

Salt water is an example of a ______

Answer 3

mixture

Question 4

A pure substance consists of how many elements or compounds?

Answer 4

Only 1.

Question 5

What does insoluble mean?

Answer 5

That it cannot be dissolved

Question 6

Which method would be best to separate salt from a salt solution (sea water)?

Answer 6

Evaporation

Question 7

Which method would be best to separate sand from a mixture of sand and water?

Answer 7

Filtration

Question 8

Which method would be best to separate a mixture of liquids with different boiling points?

Answer 8

Fractional distillation

Question 9

Which method would be best to separate the solvent (water) from sea water?

Answer 9

Distillation

Question 10

What words describe water turning from:
a. A liquid to a gas
b. A gas to a liquid

Answer 10

a. Evaporation
b. Condensation

Question 11

What pieces of equipment would you need for filtration?

Answer 11

Funnel, filter paper, a beaker or conical flask to collect the filtrate.

Question 12

What pieces of equipment would you need for evaporation?

Answer 12

Bunsen burner (or heating pad), evaporating dish , tripod, gauze.

Question 13

Water has a boiling point of 100 degrees. Ethanol (alcohol) has a boiling point of 78 degrees. If you heated a mixture of water and alcohol, which substance would evaporate first?

Answer 13

Ethanol as it has a lower boiling point.