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?
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When the particles of the water vapour hit the window, they stick to it
100%
The particles lose energy to the cold surface, slow down and become closer together
0%
The particles clump together because of the light coming through the window, forming water
0%
The particles speed up, forming water droplets
Q.2.
What will a substance do when it is heated?
100%
It will expand
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It will contract
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It will burn
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It will explode
Q.3.
Why are warm fluids less dense than their cold equivalent?
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Some of the fluid escapes from the particles so they are lighter
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Their particles are closer together
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Hot particles lose their quarks and become lighter
100%
Their particles are further apart
Q.4.
Which of the following would increase the speed at which a liquid evaporates?
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Covering the liquid with a beaker
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Making sure that there were no draughts
100%
Spreading it out over a larger area
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All of the above
Q.5.
What happens to a gas in a sealed container when it is heated?
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The gas explodes
100%
The pressure of the gas increases
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The gas implodes
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The gas condenses
Q.6.
When a liquid is evaporating it cools down. Why?
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The faster particles escape leaving the slower particles behind
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There are fewer particles
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Evaporation needs a breeze and breezes cool things down
100%
It has a smaller volume than before
Q.7.
Which states of matter contract when you cool them?
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Only gases
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Only solids
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Liquids and gases
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All of them
Q.8.
According to the kinetic theory, what are the particles in a heated solid doing?
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Vibrating more slowly than when the solid was cool
100%
Vibrating more rapidly than when the solid was cool
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Moving around more slowly than when the solid was cool
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Moving around more rapidly than when the solid was cool
Q.9.
Some types of thermometer are filled with mercury, a liquid metal. Why do they work?
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Mercury is a metal so it conducts heat into the thermometer
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Mercury behaves in an unusual way
100%
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
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The particles move faster or slower depending on the temperature so the mercury expands and contracts
Q.10.
Why does hot air rise?
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Heat naturally goes upwards
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It is pushed there by the cold air
100%
It is less dense than colder air
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It doesn't, this is a myth
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