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Yr 8 Chemistry Revision

Total questions: 50

Worksheet time: 33mins

Name
Class
Date
1.

Salt is a combination of one sodium atom and one chlorine atom. Its formula, in symbols, would be

a)

S C

b)

So Cl

c)

Ga Ge

d)

Na Cl

2.

Condensation

a)

a change of state from gas to solid

b)

a change of state from liquid to gas

c)

a change of state from solid to liquid

d)

a change of state from gas to liquid

3.

Sublimation

a)

when a solid changes to a liquid

b)

when a new chemical forms after a reaction

c)

when a solid changes to a gas

d)

when a reaction gives off heat

4.

Physical change

a)

the parts of a mixture remain unchanged

b)

substances are combined in a reaction

c)

a new substance is formed

d)

a solid becomes liquid

5.

Molecule

a)

part of an atom

b)

a group of atoms

c)

a mixture of atoms

d)

a type of atom

6.

Evaporation

a)

the amount of heat lost in a reaction

b)

the change from gas to liquid

c)

the space occupied by a substance

d)

a change that produces a new substance

7.
What is a pure substance that cannot be broken down into any other substance by physical or chemical means. Ex: Gold, Silver, Oxygen, & Nitrogen
a)
element
b)
compound
c)
mixture
d)
salad
8.
Gold is an example of a(n) 
a)
pure element
b)
pure compound
c)
pure mixture
9.
This ice cube is changing from a solid to a ______? 
a)
Solid
b)
Liquid
c)
Gas
10.

What is the symbol for potassium

a)

P

b)

K

c)

Po

d)

T

11.

C6H12O6 ... how many carbon atoms?

a)

6

b)

12

c)

18

d)

1

12.
Taking energy away from a substance will make its particles move
a)
more slowly
b)
more quickly
c)
at the same speed
13.
When a gas forms directly from a solid, skipping the liquid phase. it is called
a)
deposition
b)
sublimation
c)
evaporation
d)
condensation
14.

On a hot, humid summer day drops of water form on a can of cold soda. What process caused this to happen?

a)

condensation

b)

freezing

c)

vaporization

d)

deposition

15.

It rained yesterday, but today there are no puddles left on the ground. What process caused this to happen?

a)

condensation

b)

evaporation

c)

sublimation

d)

deposition

16.

Herbie makes a graph of the temperature of a solid as he heats it. What shape will the graph have?

a)

A diagonal line that starts low and keeps going up the whole way.

b)

A diagonal line that starts low, has a flat portion, then goes up again.

17.

What does "#4" represent on the graph?

a)

melting

b)

liquid phase

c)

boiling

d)

gas phase

18.
What does "#2" represent on the graph? 
a)
solid phase
b)
melting
c)
liquid phase
d)
boiling
19.
What does "#5" represent on the graph? 
a)
solid phase 
b)
melting
c)
boiling
d)
gas phase
20.
What does "#3" represent on the graph? 
a)
melting
b)
liquid phase
c)
boiling
d)
gas phase
21.
Is a burning candle a physical or chemical change?
a)
Physical
b)
Chemical
22.
Is getting a tan a physical or chemical change?
a)
Physical
b)
Chemical
23.
When things burn this is a chemical reaction called COMBUSTION.  What does every combustion reaction require?
a)
Hydrogen
b)
Carbon dioxide
c)
Oxygen
d)
Water
24.
If a new substance is formed would this be a physical or chemical change?
a)
Physical
b)
Chemical
25.

What is the picture displayed?

a)

Carbon Dioxide

b)

Water

c)

Gasoline

d)

Liquid Nitrogen

26.
What is the term for combining 2 or more atoms together?
a)
atoms
b)
elements
c)
molecules
d)
compounds
27.

How would H2O be classified? Check all that apply.

a)

Atom

b)

Molecule

c)

Compound

28.

How would O2 be qualified. Check all answers that apply.

a)

Atom

b)

Molecule

c)

Compound

29.
Atoms are more than ________ times smaller than the width of a hair.
a)
10
b)
100
c)
1,000
d)
10,000
30.
A molecule is made up of ____ or more atoms.
a)
1
b)
2
c)
3
d)
4
31.

What is the chemical symbol for the element mercury?

a)

Hg

b)

Merc

c)

MeC

d)

MY

32.
Explain the difference between an atom and a molecule.
a)
One molecule is made of one atom.
b)
One molecule is always made of different particles.
c)
One molecule is made of more than one atom.
d)
One molecule is made of more than two atoms.
33.
What are the 3 particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
34.
What are these?
a)
Molecules
b)
Compounds
35.
Aluminum
a)
A
b)
Au
c)
Al
d)
Am
36.
What is sugar?
a)
element
b)
compound
c)
mixture
37.
Which is a quality that only gasses display
a)
Spread out to fill all available space
b)
Take the shape of their container
c)
Can't be compressed
d)
All of these
38.
Gas molecules can easily be compressed  because ___________. 
a)
gas molecules are soft
b)
gas molecules are far apart
c)
gas molecules follow the shape of the container
39.
At higher temperatures...
a)
particles in an object have less energy
b)
particles in an object move faster
c)
a gas contracts
40.
If you place a balloon in a freezer what happens to the size of the balloon?
a)
Doubles
b)
increases
c)
decreases
d)
stays still
41.
Matter is made up of
a)
cells
b)
carbon
c)
metal
d)
atoms
42.
When liquid changes into a gas, it is called
a)
melting point temperature
b)
boiling point temperature
c)
condensation point
d)
freezing point temperature
43.

Arrange the states of matter in order of increasing energy (lowest energy to highest energy).

a)

solid, liquid, gas

b)

gas, solid, liquid

c)

gas, liquid, solid

d)

liquid, gas, solid

44.

A change in which the form or shape of a substance changes; does not result in the formation of a new substance

a)

Volume

b)

Physical Change

c)

Liquid

d)

Chemical Change

45.
Are the molecules in wood the same as ash 
a)
yes 
b)
depends 
c)
does it matter 
d)
no
46.
What is the symbol for Potassium?
a)
P
b)
K
c)
Pb
d)
Pd
47.

Change from liquid to gas is called....

a)

expansion

b)

evaporation

c)

condensation

d)

sublimation

48.

What happens to particles when energy is added (heated)?

a)

They speed up and spread out

b)

They slow down and compress

c)

They stop moving

d)

They move closer together and speed up

49.
The phase change from water vapor to liquid water is known as...
a)
evaporation
b)
precipitation
c)
condensation
d)
sublimation
50.

What state of matter is pictured?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

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