How Good Is Your 8th Grade Physics?
The kinetic theory of matter is one of the models that scientists use to help them to make sense of the world around them. The word kinetic always suggests something is moving, and this theory is about the movement of particles in solids, liquids, and gases. Particles transfer heat energy into kinetic energy.
- 1.
Which states of matter contract when you cool them?- A.
Only gases
- B.
Only solids
- C.
Liquids and gases
- D.
All of them
- 2.
Which of the following would increase the speed at which a liquid evaporates?
- A.
Covering the liquid with a beaker
- B.
Making sure that there were no draughts
- C.
Spreading it out over a larger area
- D.
All of the above
- 3.
Some types of thermometer are filled with mercury, a liquid metal. Why do they work?
- A.
Mercury is a metal so it conducts heat into the thermometer
- B.
Mercury behaves in an unusual way
- C.
Particles of liquids expand when they are heated and contract when they are cooled so the mercury fills more or less of the thermometer depending on the temperature
- D.
The particles move faster or slower depending on the temperature so the mercury expands and contracts
- 4.
What happens to the particles of water vapour as it changes from a gas into a liquid to form a film of water on the inside surface of a cold window?
- A.
When the particles of the water vapour hit the window, they stick to it
- B.
The particles lose energy to the cold surface, slow down and become closer together
- C.
The particles clump together because of the light coming through the window, forming water
- D.
The particles speed up, forming water droplets
- 5.
What happens to a gas in a sealed container when it is heated?
- A.
The gas explodes
- B.
The pressure of the gas increases
- C.
The gas implodes
- D.
The gas condenses
- 6.
Why does hot air rise?
- A.
Heat naturally goes upwards
- B.
It is pushed there by the cold air
- C.
It is less dense than colder air
- D.
It doesn't, this is a myth
- 7.
What will a substance do when it is heated?
- A.
It will expand
- B.
It will contract
- C.
It will burn
- D.
It will explode
- 8.
When a liquid is evaporating it cools down. Why?
- A.
The faster particles escape leaving the slower particles behind
- B.
There are fewer particles
- C.
Evaporation needs a breeze and breezes cool things down
- D.
It has a smaller volume than before
- 9.
Why are warm fluids less dense than their cold equivalent?
- A.
Some of the fluid escapes from the particles so they are lighter
- B.
Their particles are closer together
- C.
Hot particles lose their quarks and become lighter
- D.
Their particles are further apart
- 10.
According to the kinetic theory, what are the particles in a heated solid doing?
- A.
Vibrating more slowly than when the solid was cool
- B.
Vibrating more rapidly than when the solid was cool
- C.
Moving around more slowly than when the solid was cool
- D.
Moving around more rapidly than when the solid was cool
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