Science Grade 8 Question Preview (ID: 42784)


Science Grade 8. TEACHERS: click here for quick copy question ID numbers.

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) -

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) -

Are particles in liquids and gases constantly moving
a) False
b) True
c) No
d) -

Do the particles of liquids and gases move randomly
a) Never
b) No
c) Yes
d) -

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

Factors that affect Rate
a) The mass of the particle
b) The state of the particle
c) The temperature of the particle
d) All

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

What is energy
a) Ability to change
b) Heat
c) Cold
d) None

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

What is temperature
a) Average kinetic energy of the individual particles
b) Hot - more energy
c) Cold - less energy
d) All

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

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