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7E : Mixtures and Separation

Total questions: 60

Worksheet time: 44mins

Name
Class
Date
1.

Which of the following are mixtures? (choose 2)

a)

carbon dioxide

b)

soil

c)

diamond

d)

air

2.

Which of the following are pure substances? (choose 2)

a)

chocolate flavoured milk

b)

purified water

c)

vitamin C

d)

soil

3.

Mayonnaise is a mixture containing tiny oil droplets spread throughout vinegar. These two components are:

a)

both gases

b)

soild and liquid

c)

solid and gas

d)

both liquids

4.

Why is mud is a mixture?

a)

Because the soil particles in it are spread throughout water particles and no new substances have been formed.

b)

Because the soil particles in it are mixed together

c)

Because mud can be easily mixed with a wooden stick

d)

Because the soil particles in it are clumped together

5.

Is vinegar a mixture?

a)

Yes because it is made of two substances- water and acetic acid

b)

No because it is made of one substance

c)

No because it is only made of liquid particles

d)

No because it is only made of sour particles

6.

What is a mixture?

a)

It is a combination of two or more substances that keep their identities

b)

It is a combination of two or more substances that reacts to become a compound

7.
Salt and pepper would be an example of a
a)
mixture
b)
solution
8.

This is an example of a

a)

Solution

b)

Mixture

9.

This is a type of mixture where one substance dissolves into another

a)

Solution

b)

Suspension

c)

Compound

d)

Colloid

10.

This tool is used for separating solids from liquids or large particles from fine particles

a)

Hands

b)

Sieve

c)

Boiling water

d)

Evaporation

11.
A material that allows liquids to pass through it, while very small solids remain behind
a)
Filter
b)
Sieve
c)
Funnel
d)
Spoon
12.
Which is true of both Mixtures and Solutions
a)
Molecules are mixed evenly
b)
They can both be separated
c)
Separated by evaporation
d)
Can be separated with a filter
13.

This picture represents which of the following?

a)

element

b)

compound

c)

mixture

14.

Lemonade, coke, and salt water are all examples of _________.

a)

Solutions

b)

Mixtures

c)

Pure Substances

d)

Factors of solubility

15.

A combination of substances that dissolve into one another--they are evenly mixed so that individual parts cannot be seen or separated.

a)

solutions

b)

mixtures

c)

observations

16.

________ is the ability to dissolve in water.

a)

Conductivity

b)

Magnetism

c)

Solubility

d)

Reflectivity

17.

A solution is made when one substance _________ in another.

a)

settles at the bottom

b)

moves

c)

dissolves

d)

is suspended

18.

Which one of the following solids is insoluble (can't dissolve) in water?

a)

sugar

b)

sand

c)

instant coffee

d)

salt

19.
What is a solute?
a)
The substance that does the dissolving in a solution.
b)
The substance that is dissolved into the solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
20.

In a saltwater solution, the salt is the __________.

a)

solvent

b)

molecule

c)

part

d)

solute

21.

In a saltwater solution, the water is the _________

a)

solvent

b)

mixture

c)

combination

d)

solute

22.

Is oil and water a mixture or a solution?

a)

Mixture

b)

Solution

23.

In a mixture, the properties of a substance ______________

a)

do not change

b)

change forms

c)

turn into a liquid

d)

become solid

24.

Mixtures are _________

a)

easily separated

b)

impossible to separate

c)

always solutions

d)

only liquids

25.

When a substance dissolves, that means its particles _________.

a)

spread out evenly

b)

disappear

c)

turn into water

26.

True or false: cold water causes sugar to dissolve more easily than warm water

a)

True

b)

False

27.

Water is the univeral ____.

a)

solute

b)

solvent

c)

solution

28.

solute + solvent =

a)

solution

b)

equation

29.
What is a solute?
a)
The substance that does the dissolving in a solution.
b)
The substance that is dissolved into the solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
30.
What is a solvent?
a)
The substance that does the dissolving in a solution.
b)
The substance that is being dissolved in a solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
31.

Solutes dissolve quicker if you stir them.

a)

true

b)

false

32.

Define the term soluble.

a)

Can dissolve in water

b)

Cannot dissolve in water

c)

Partially dissolves in water

33.

Define the term insoluble.

a)

Can dissolve in water.

b)

Cannot dissolve in water.

c)

Partially dissolves in water.

34.
When we put a substance in water and stir it to see if it dissolves we are testing for_______________________.
a)
Relative Density
b)
Solubility
c)
Mass
d)
Temperature
35.

What happens when salty water is boiled?

a)

The salt becomes a new compound and water evaporates as it has a low boiling point

b)

The water evaporates and the salt remains in the beaker as it has a high melting point

c)

The water becomes a new compound and evaporates while salt remains in the beaker

d)

The water will disappear and the salt remains in the beaker as it is a solid

36.

Which of the following is a correct statement about distillation

a)

The components of the mixture have different densities

b)

The components of the mixture have different melting points

c)

The components of the mixture have different boiling points

d)

The components of the mixture form a heterogeneous mixture

37.

What is the correct order for obtaining salt from a mixture of sand and salt?

a)

Dissolving in water - filtration – evaporation

b)

Evaporation - filtration - dissolving in water

c)

Filtration - dissolving in water - evaporation

d)

Dissolving in water – evaporation - filtration

38.

The process used to separate heterogeneous mixtures of solids and liquids is called

a)

filtration

b)

crystallization

c)

distillation

d)

chromatography

39.

Name the separation technique shown in the diagram

a)

Filtration

b)

Chromatography

c)

Centrifugation

d)

Distillation

40.

Which are methods of separating dissolved particles from the liquid they are dissolved in?

a)

Filtration, separation funnel, crystallization

b)

Filtration, distillation, crystallization

c)

Evaporation, filtration, crystallization

d)

Evaporation, distillation, crystallization

41.

What separation method is used to separate substances by their boiling point?

a)

Filtration

b)

Evaporation

c)

Crystallization

d)

Distillation

42.

Which one of the following techniques would best be used to separate soil and water?

a)

crystallization

b)

distillation

c)

Filtration

d)

Chromatography

43.

The process of separating small, insoluble solids from a liquid using a filter

a)

filtration

b)

evaporation

c)

sieving

d)

desalination

44.

The sand that is left on the filter paper is known as

a)

filtrate

b)

semi-permeable

c)

residue

d)

sieving

45.

The process of changing a liquid to a gas is called

a)

evaporation

b)

filtration

c)

sieving

d)

decanting

46.

Insoluble solids like sand and flour can be separated from water by

a)

decanting

b)

sieving

c)

filtration

d)

evaporation

47.

For paper chromatography to work,

a)

the dyes must have different boiling points.

b)

the dyes must have different solubilities in the solvent.

c)

the starting line on the chromatogram must be drawn using pen.

d)

The starting line must be below the level of the solvent.

48.

Which ink is most soluble?

a)

Blue

b)

Red

c)

Yellow

d)

Green

49.

Which ink is a mixture?

a)

Blue

b)

Red

c)

Yellow

d)

Black

50.

Referring to the chromatogram, black ink contains

a)

Blue, red and yellow ink only

b)

Blue, red, yellow and green ink

c)

Blue and yellow ink

d)

Black ink only

51.

What is the separation technique in the picture?

a)

Filtration

b)

Crystallization

c)

Using Funnel

d)

Chromatography

52.

What is the separating technique in the picture?

a)

Evaporation

b)

Sublimation

c)

Chromatography

d)

Filtration

53.

What is the separation technique in the picture?

a)

Evaporation

b)

Centifugation

c)

Decantation

d)

Crystallization

54.

We can separate salt from water using filtration?

a)

True

b)

False

55.

When no more solute dissolves the solution is _________

a)

supersaturated

b)

unsaturated

c)

saturated

d)

supercalifragilisticexpialidocious

56.
A solution is a ________ mixture. 
a)
heterogeneous 
b)
homogeneous 
c)
dumb 
d)
mixed 
57.
Another name for a homogeneous mixture is 
a)
an element.
b)
a solution.
c)
a compound.
58.
To make a solute dissolve more quickly i n a solvent which would you do?
a)
Put it in cold water and stir it
b)
Put it in warm water and stir it
59.
Milk is a 
a)
solution
b)
suspension
c)
colloid
60.
What type of mixture separates upon standing?
a)
Solution
b)
Alloy
c)
Colloid
d)
Suspension

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