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Mixing and Separating

Total questions: 35

Worksheet time: 16mins

Name
Class
Date
1.

(a)   : A substance that dissolves

2.

(a)   : type of mixture that always looks cloudy because clumps of insoluble particles remain suspended throughout it – they don’t settle as sediment

3.

Emulsion: a (a)   of two or more liquids

4.

Which one is not a colloid

a)

Foam

b)

Gel

c)

Emulsion

d)

Coffee

5.

substance that dissolves the solute

a)

solution

b)

solvent

c)

saturation

d)

sol

6.
If a spoonful of sugar is mixed in a glass of water, what is the water called? 
a)
solute
b)
solution
c)
solvent
d)
element 
7.

A combination of two or more substances that can be physically separated is called a...

a)

Mixture

b)

Pure substance

c)

Compound

8.
Milk is a 
a)
solution
b)
suspension
c)
colloid
9.
Sand floating in water, but most of the sand is settled at the bottom this an example of which type of mixture?
a)
A solution
b)
A colloid
c)
A suspension
d)
A compound
10.
Particles are spread throughout a fluid but are too large to stay mixed w/o being stirred or shaken.
a)
suspension
b)
colloid
c)
solution
11.

Which of these are examples of colloids? Select all that apply.

a)

mayonaisse

b)

gelatin

c)

oils

d)

jelly

12.

A snow globe would be an example of a __________________.

a)

colloid

b)

solution

c)

suspension

13.

Tea and air are examples of ________________.

a)

solutions

b)

suspensions

c)

colloids

14.

FOG

a)

solution

b)

suspension

c)

colloid

d)

alloy

15.
a)

solution

b)

suspension

c)

colloid

d)

alloy

16.

What happens to the solubility of most solutes as the temperature increases?

a)

increases

b)

decreases

c)

stays the same

d)

can't predict

17.

Which of the following is the best description of a solution? (Choose all the correct answers)

a)

can not be separated using a filter

b)

doesn't scatter light

c)

a solute dissolved in a solvent

d)

homogeneous

18.

What is it called when light passes through a colloid and scatters/spreads out

a)

tyndall effect

b)

fog effect

c)

spreading out effect

d)

substance effect

19.

___________ are the smallest unit of an element that maintains the properties of that element.

a)

Atoms

b)

Elements

c)

Compounds

d)

Mixtures

20.

A _______________ is made up of one or more of the same kind of atoms chemically combined.

a)

atom

b)

element

c)

molecule

d)

compound

21.

A __________________ is a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity.

a)

mixture

b)

pure substance

c)

compound

d)

element

22.

Which of these is a compound?

a)

Aluminium (Al)

b)

Carbon Dioxide (CO2)

c)

Nitrogen (N)

d)

Sand

23.

What is the separation technique for which this lab instrument is needed?

a)

sieving

b)

decanting

c)

filtering

d)

magnetic separation

24.

You've got a mixture of powdered sugar and cooking salt. What is the suitable separation technique for this mixture? Hint: the particles of cooking salt are much bigger than those of powdered sugar.

a)

filtering

b)

sieving

c)

distillation

d)

separation technique

25.

Ethanol and water have different boiling point. What would be the suitable separation technique for a mixture of both substances?

a)

Distillation

b)

Chromatography paper

c)

Sieving

26.

You want to separate the components of a felt tip pen. What is the suitable separation technique?

a)

distillation

b)

chromatography paper

c)

decanting

d)

sieving

27.

How would you separate the substances shown in the picture (oil and water)?

a)

by sieving

b)

by decanting

c)

by distillation

d)

by filtering

28.

What is the suitable separation technique for a mixture of iron filings and salt?

a)

sieving

b)

filtering

c)

magnetic separation

29.

Which separation technique is used to obtain pure water from seawater?

a)

Simple distillation

b)

Filtration

c)

Chromatography

d)

Evaporation

30.

What is the physical property on which fractional distillation depends?

a)

different boiling points

b)

different melting points

c)

different solubilities

d)

different densities

31.

Which separation technique is used to obtain pure oxygen from liquid air?

a)

Simple distillation

b)

Filtration

c)

Chromatography

d)

Fractional distillation

32.

Which ink is a mixture?

a)

Blue

b)

Red

c)

Yellow

d)

Black

33.

Which ink is most soluble?

a)

Blue

b)

Red

c)

Yellow

d)

Green

34.

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

35.

During filtration, the solid that is trapped in the filter paper is called ..A.. and the liquid that has passed through the filter paper is called ..B..

a)

A: residue B: filtrate

b)

A: residue B: filterate

c)

A: filtrate B: residue

d)

A: filterate B: residue

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