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