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Grade 7. Questions of Unit 8

Total questions: 40

Worksheet time: 38mins

Name
Class
Date
1.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
2.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
3.
a)
element
b)
compound
c)
mixture of elements and compounds
d)
mixture of compounds
4.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds and elements
5.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
6.
a)
element
b)
compound
c)
mixture of elements and compounds
d)
mixture of compounds
7.

This method is a technique used in separating a less-dense substance from a denser one.

a)

decantation

b)

evaporation

c)

distillation

d)

filtration

8.

This technique is based on the differences of the boiling point of the substance in the mixture.

a)

decantation

b)

distillation

c)

filtration

d)

chromatography

9.

This involves using a strainer or a big screen to separate the components of solid mixtures.

a)

chromatography

b)

distillation

c)

sieving

d)

physical manipulation

10.

What method of separating mixtures is shown in the picture?

a)

filtration

b)

distillation

c)

physical manipulation

d)

use of magnet

11.

This method is used to separate metals from non metals.

a)

use of magnet

b)

physical manipulation

c)

sieving

d)

chromatography

12.

This method is useful in a pharmaceutical industry in determining the amount of each chemical in each product.

a)

distillation

b)

chromatography

c)

sieving

d)

decantation

13.

This method is used in separating soluble solid from a liquid such as salt from water.

a)

evaporation

b)

distillation

c)

decantation

d)

filtration

14.

This method is utilized in industries like junkyards to remove metal scraps from other materials.

a)

chromatography

b)

physical manipulation

c)

use of magnet

d)

distillation

15.
Which is an example of a solute?
a)
Egg whites
b)
Sugar
c)
Water
d)
Acetone
16.
Which is an example of a solvent?
a)
Salt
b)
Egg whites
c)
Water
d)
Sugar
17.

What is a solvent

a)

A liquid that will dissolve a solid solute

b)

Another word for solution

c)

A thing that make drinks change colour

d)

Usually the solid about to be dissolved

18.

The ___ is the thing being dissolved.

a)

solute

b)

solvent

c)

mixture

d)

solution

19.

The substance being dissolved in a solution is the?

a)

solution

b)

solute

c)

solvent

d)

mixture

20.

The substance in which a solute is dissolved is a?

a)

solution

b)

solvent

c)

alloy

d)

mixture

21.

How could you change a saturated solution to an unsaturated solution?

a)

Add solvent

b)

Add solute

22.

Water becomes __________ changing from a solid to a liquid

a)

more dense & more kinetically chaged

b)

less dense & less kinetically charged

c)

more dense & less kinetically charged

d)

less dense & more kinetically charged

23.

Identify the saturation associated with the product of this experiment.

a)

Unsaturated

b)

Saturated

c)

Supersaturated

24.

H2 is an example of a(n)...

check two answers. And submit

a)

Element

b)

Compound

c)

Molecule

d)

Heterogeneous Mixture

25.

2 or more different elements that are bonded together is called...

a)

A. element

b)

B. compound

c)

C. mixture

d)

D. solution

26.

What is CO2 and example of?

a)

element

b)

molecules

c)

compound

27.
Which of the following lists only elements?
a)
H2O + OH, MgCl2
b)
H2O, KF, Ne
c)
KCl, Ag, Au
d)
K, Cl, N
28.

Which food dyes in the diagram on the right only contain one colour?

a)

brown

b)

blue

c)

yellow

d)

blue and yellow

29.

Which food dye contains three colours?

a)

blue

b)

brown

c)

yellow

30.

Chromatography separate the mixture of dyes on the basis of their

a)

density

b)

gravity

c)

solubility

d)

boiling point

31.

What is Paper Chromatography?

a)

Paper Chromatography uses a strip of paper as the stationary phase

b)

Chromatography uses an absorbent material on flat glass or plastic plates

c)

Paper chromatography is used in airports to detect bombs and is used is forensics in many different ways

32.
What is a substance that is dissolved in another substance? 
a)
solution
b)
solute
c)
solvent
d)
compound
33.
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
34.
In the above picture, a powder is about to be poured into the liquid. Which of the following should be done to make this powder dissolve faster?

a)
stir the powder in the liquid
b)
freeze the mixture
c)
add more powder to the liquid
d)
store the mixture in a dark place
35.
A solution that is considered dilute would be....
a)
Dark in color
b)
Have a strong scent
c)
Have a large amount of solute
d)
Have a small amount of solute
36.
When Koolaid mix is light colored and tastes watery it is a _______ solution.
a)
saturated 
b)
diluted
37.
When no more sugar will dissolve in a glass of water, the solution is
a)
unsaturated
b)
saturated
c)
supersaturated
d)
suspended
38.

What is a mixture?

a)

a combination of elements to make a new substance

b)

a combination of substances where new substances are formed through a reaction

c)

a chemically combined substance

d)

a combination of substances in which the atoms of the substance do not chemically combine

39.

Examples are milk and gasoline.

a)

element

b)

compound

c)

mixture

40.

Look at the picture of the mineral water label. List the three most abundant minerals in this bottle of mineral water.

a)

calcium, bicarbonate, chlorine

b)

calcium, magnesium, sodium

c)

calcium, potassium, sodium

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