Year 8 Chemistry
TEST 1
Elements, compounds & the periodic table
NAME _____________________________
True or false
/5
Multiple choice
/9
Short answer
/ 20
TOTAL
/ 34
PERCENTAGE
%
SECTION A: TRUE OR FALSE
Circle the correct answer for the following true or false questions
1. The particle theory states that particles that make up all matter are constantly in motion
True
False
2. A compound is made up of one kind of element.
True
False
3. In applying the particle theory to real life, it is better to make a cup of tea with cold water.
True
False
4. Elements are represented by symbols.
True
False
5. The atomic number of an element is the number of protons in its atom.
True
False
SECTION B: MULTIPLE CHOICE
Choose the most correct answer for the following questions.
1. Which of these can be compressed the furthest?
a)
b)
c)
d)
Solid
Gas
Liquid
Peanut butter
2. The chemical formula for carbon monoxide is
a)
b)
c)
d)
CO2
CO
CO3
C2O
3. If copper sulphate is made up of one copper, one sulphur and four oxygen atoms, what would
be its chemical formula?
a)
b)
c)
d)
CoSO4
CSO4
CScO4
CuSO4
4. The melting points is:
a)
b)
c)
d)
When a gas changes to a liquid
The same thing as condensation
When a solid changes to a liquid
0ºC
5. Kinetic energy is
a)
b)
c)
d)
The energy an object has when it is moving
The energy particles have when they are changing state
The energy of all living things
The energy in an atom
6. The particle theory explains
a)
b)
c)
d)
That particles are very small
That there is nothing in the space between particles
That particles in a liquid move slower than particles in a solid
That all particles are divisible
The following 3 questions refer to the diagrams below:
Diagram A
Diagram B
Diagram C
7. A mixture of water, sand and iron filings was found in the lab. This mixture could be best
represented by:
a)
b)
c)
d)
Diagram A
Diagram B
Diagram C
None of the diagrams
8. Diagram B represents:
a)
b)
c)
d)
A compound with a lattice molecule shape
A compound with a complex molecule shape
A metal cube
An element with a lattice molecule shape
9. A mixture of two compound substances can be represented by:
a)
b)
c)
d)
Diagram A
Diagram B
Diagram C
None of the diagrams
SECTION C: SHORT ANSWER
Answer the following questions in the spaces provided.
10. Classify the following substances as elements, compounds or mixtures:
(4 marks)
a) Air
________________________________
b) Hydrogen
________________________________
c) Iron oxide
________________________________
d) Copper
________________________________
e) Table salt
________________________________
f) Soft drink
________________________________
g) Distilled Water
________________________________
h) Sea Water
________________________________
11. Complete the following table:
(9 marks)
Element
element
symbol
atomic
number
mass
number
no. of
protons
Cobalt
33
11
no. of
neutrons
no. of
electrons
16. Draw a diagram of a Neon atom in the box below.
a) Firstly, label the symbols in the legend. Use the appropriate symbol for each subatomic unit.
b) Secondly, draw the atom using these symbols to accurately represent what the Neon atom
looks like.
(7 marks)
Legend
End of test