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8th grade Chemistry revision quiz (unit 1)

Total questions: 26

Worksheet time: 30mins

Name
Class
Date
1.
Freezing
a)
Solid to gas
b)
Liquid to solid
c)
Gas to solid
d)
Liquid to gas
2.
Particles of a liquid
a)
are tightly packed together and stay in a fixed position.
b)
have no viscosity.
c)
decrease in volume with increasing temperature.
d)
are free to move around one another but still touch.
3.
What is condensation?
a)
gas to solid
b)
gas to liquid
c)
liquid to solid 
d)
solid to liquid 
4.
What is sugar?
a)
element
b)
compound
c)
mixture
5.
When two or more elements chemically combine
a)
element
b)
compound
c)
mixture
d)
solution
6.
Which statement best describes an element?
a)
made from mixture 
b)
thousands in the world
c)
pure, made of only one atom
d)
can be separated 
7.
Is the following an element or compound?
a)
element
b)
compound
8.
Review:
What is the formula for density?
a)
D= M x V
b)
D= V / M
c)
D= V+M
d)
D= M / V
9.
a)

Compound

b)

Mixture of elements and compounds

c)

Mixture of elements

d)

Mixture of compounds

10.
a)

Element

b)

Compound

c)

Mixture of elements

d)

Mixture of compounds

11.
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
12.

Why does salt dissolves faster in hot water?

a)

Hot water hive high kinetic energy to solvent and solute perticles

b)

More collision between solute and solvent particles

c)

Higher temperature gives more surgace area to the solute

13.

Fog

a)

solution

b)

Suspension

c)

Colloid

d)

alloy

14.

sand in water

a)

solution

b)

colloid

c)

suspension

d)

alloy

15.

Sunscreen

a)

solution

b)

colloid

c)

suspension

d)

Alloy

16.

snow globe

a)

solution

b)

suspension

c)

alloy

d)

colloid

17.

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

a)

tyndall effect

b)

spreading out effect

c)

fog effect

d)

substance effect

18.

Milk?

a)

Aerosol

b)

liquid sol

c)

emulsion

d)

liquid foam

19.

Which kind of substance is this?

a)

liquid sol

b)

solid sol

c)

liquid foam

d)

solid foam

20.

What is the general formula of percentage composition of an element in the given compound?

a)

% mass of element = mass of element considering the number of that in the compound divided by mass of the compound times 100

b)

% mass of element = mass of element considering the number of that in the compound divided by the mass of that element

c)

% mass of element = mass of element in the compound divided by 100

d)

% mass of element = mass of element in the compound

21.

What is the percent by mass of fluorine in CaF2 (Molar mass= 78 g/mol)?

a)

24%

b)

49%

c)

49%

d)

65%

22.

Find the percent composition of Cu2S?

a)

%Cu= 67.987 %S= 32.013

b)

%Cu= 79.854 %S= 20.145

c)

%Cu= 35.946 %S= 64.054

23.

What is the percent by mass of chlorine in NaCl?

a)

39%

b)

61%

c)

35%

d)

35%

24.

The average salinity of the Red Sea is 4% and its density is 1.04 kg/dm3. How many grams of the Red Sea water should be taken to get exactly 400 g of salt through evaporation? What is the volume of that amount of water in liters?

a)

10 kg red sea water, 10.4 liters of red sea water

b)

16 kg red sea water, 10.4 liters of red sea water

c)

10 kg red sea water, 9.62 liters of red sea water

d)

16 kg red sea water, 9.62 liters of red sea water

25.

Draw the Lewis structure of CF2Cl2, HCN, CO2, N2

4 lines
26.

Write the electron configuration for Sodium 11Na and 30Zn

Explain in which group and period are they located.

4 lines

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