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15
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What is the correct conclusion from investigating melting and boiling?
Heat destroys matter
Heat causes a change of state
Heat reduces particle movement
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baam
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gift
Win 20 points!
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rocket
Go to first place!
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lifesaver
Give 15 points!
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15
×
Which conclusion is correct if ice melts faster in a warmer room?
Cold air produces heat
Higher temperature increases melting rate
Ice melts only at 0°C
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boom
Lose 50 points!
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rocket
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shark
Other team loses 5 points!
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banana
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15
×
Why should temperature be measured at regular time intervals?
To observe changes clearly
To finish the experiment quickly
To avoid using a graph
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15
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Why should the thermometer bulb be placed in the ice during a melting investigation?
To warm the thermometer
To measure the ice temperature accurately
To make the ice melt faster
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15
×
Why does water boil faster in a metal container?
Metal absorbs cold
Metal lowers the boiling point
Metal conducts heat better
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baam
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magnet
Take 25 points!
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rocket
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baam
Lose 25 points!
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15
×
Why should a lid not be tightly closed when heating water?
To allow steam to escape safely
To stop evaporation
To make water boil faster
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15
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Why should the same heat source be used when comparing boiling times?
To keep the test fair
To change the boiling point
To cool the water
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thief
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25
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seesaw
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gift
Win 10 points!
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banana
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15
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What observation shows water is close to boiling?
Small bubbles form at the bottom
Ice forms in the water
The temperature drops suddenly
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15
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What happens to water particles when water boils?
They lose energy and slow down
They gain energy and move far apart
They stop moving
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15
×
Which factor can affect the boiling point of water?
Colour of the beaker
Amount of water
Height above sea level
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15
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What happens to the temperature of ice while it is melting?
It decreases
It increases steadily
It remains constant until all ice melts
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15
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What happens to the mass of ice after it melts?
It increases
It decreases
It stays the same
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