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Science Grade 8
Test Description: Science grade 8
Instructions: Answer all questions to get your test result.
1) What does expansion do
A
and further apart
B
Particles move faster
C
all
D
Increase the volume of a substance
2) What does expansion do
A
Solids, liquids and gases expand when they are changed in state
B
Solids, liquids and gases expand when they are heated
C
None
D
Solids, liquids and gases expand when they are cooled
3) What does expansion do
A
All
B
decrease in volume
C
substance moving slower
D
and closer together
4) What is chemical reactions
A
None
B
Form 1 or more new substances
C
Takes place when when 1 or more substances
D
All
5) What is gas pressure
A
All
B
Molecules of gas continually collide
C
The force exerted is the pressure
D
spaces between molecules often move long distances before collision occurs
6) Diatomic Molecules
A
Flourine
B
all
C
Hydrogen
D
Nitrogeon
7) Diatomic Molecules
A
Oxygen
B
Chlorine and Berrilleium
C
Iodine
D
All
8) What are the 2 types of reactions
A
Exothermic - gives out energy
B
Thermic = relating to heat
C
ex = out (as exit)
D
All
9) What are the 2 types of reactions
A
exothermic = most
B
en = entered
C
All
D
Endothermic reactions - take energy in
10) Example of a physical change
A
Water = Steam
B
-
C
-
D
-
*select an answer for all questions
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