Science Grade 8 Question Preview (ID: 42794)
Science Grade 8.
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What does expansion do
a) Increase the volume of a substance
b) Particles move faster
c) and further apart
d) all
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) Solids, liquids and gases expand when they are changed in state
d) None
What does expansion do
a) decrease in volume
b) substance moving slower
c) and closer together
d) All
What is chemical reactions
a) Takes place when when 1 or more substances
b) Form 1 or more new substances
c) All
d) None
What is gas pressure
a) Molecules of gas continually collide
b) spaces between molecules often move long distances before collision occurs
c) The force exerted is the pressure
d) All
Diatomic Molecules
a) Hydrogen
b) Nitrogeon
c) Flourine
d) all
Diatomic Molecules
a) Oxygen
b) Iodine
c) Chlorine and Berrilleium
d) All
What are the 2 types of reactions
a) Exothermic - gives out energy
b) ex = out (as exit)
c) Thermic = relating to heat
d) All
What are the 2 types of reactions
a) Endothermic reactions - take energy in
b) en = entered
c) exothermic = most
d) All
Example of a physical change
a) Water = Steam
b) -
c) -
d) -
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