Science Grade 8 Question Preview (ID: 42784)
Science Grade 8.
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Factors that affect Rate
a) The size of the spaces between particles
b) -
c) The movement
d) The diffusion
Why do particles diffuse
a) Because they need to create a mixture
b) Because they are in constant motion
c) Because of the gravity pull
d) -
What is changes of state
a) None
b) Both
c) In Science change of state refers to the change in physical state
d) eg. liquid to solid
Does change of state involve energy
a) Yes
b) No
c) Never
d) All
For particles to change from one state to another
a) There is no energy involved
b) It must either gain or lose energy
c) It only requires heat
d) None
Define sublimatin
a) Some substances can change from solid to gas without changing to liquid
b) During this process the surface gain enough energy to become a gas
c) All
d) None
What is temperature
a) Average kinetic energy of the individual particles
b) Hot - more energy
c) Cold - less energy
d) All
What is kinetic enregy
a) Energy in motion
b) Particles with a lot of kinetic energy
c) The move fast and far apart
d) All
What is thermal energy
a) Total kinetic energy of all the particles
b) In a sample of matter
c) All
d) None
Factors that affect Rate
a) The mass of the particle
b) The state of the particle
c) The temperature of the particle
d) All
What is energy
a) Ability to change
b) Heat
c) Cold
d) None
Mixing and spread of particles in gas and liquid is called
a) Mixture
b) Diffusion
c) Separation
d) -
Diffusion can be described as random movement from a
a) Low concentration to a High concentration
b) High concentration to a low concentration
c) High concentration to a low concentration to spread evenly
d) Neither
Do the particles of liquids and gases move randomly
a) Never
b) No
c) Yes
d) -
Are particles in liquids and gases constantly moving
a) False
b) True
c) No
d) -
Do gas particles move very fast
a) Yes
b) No
c) All the time
d) -
Gas particles
a) Has a no energy
b) Moves very slow
c) Possess a lot of energy
d) -
Gases can be compressed because particles can be forced closer together
a) Never
b) No
c) Yes
d) -
Does gas spread quickly
a) Yes
b) No
c) Maybe
d) -
Particles in a Gas
a) Are all the same
b) Have no particular arrangement
c) They are scattered all together
d) -
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