Share ice melting and boiling of water
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Why is a thermometer used during an investigation of melting ice?
To make the ice melt faster
To measure the temperature change
To stir the ice
What happens to particles in ice as it melts?
They lose energy and stop moving
They gain energy and move past each other
They change into gas
Which variable should be kept the same to make an ice melting investigation fair?
The temperature recorded
The time taken to melt
The amount of ice used
At what temperature does pure ice begin to melt?
100°C
0°C
50°C
What change of state occurs when ice melts?
Solid to liquid
Solid to gas
Liquid to gas
What happens to the temperature of ice while it is melting?
It decreases
It increases steadily
It remains constant until all ice melts
Why does crushed ice melt faster than a large ice cube?
It has more mass
It has a larger surface area
It is colder
How can you tell that water has reached its boiling point?
Bubbles form throughout the liquid
Steam slowly rises from the surface
The water level drops
What is the boiling point of pure water at sea level?
100°C
50°C
0°C
Which piece of equipment is safest to use when heating water?
A ruler
A beaker
A thermometer case
What happens to water particles when water boils?
They lose energy and slow down
They gain energy and move far apart
They stop moving
Why should the same heat source be used when comparing boiling times?
To cool the water
To keep the test fair
To change the boiling point
Which change of state is reversible?
Rusting iron
Burning paper
Melting ice into water
What should be recorded during an investigation of boiling water?
Temperature at regular time intervals
Size of the beaker
Colour of the container
What is the correct conclusion from investigating melting and boiling?
Heat causes a change of state
Heat destroys matter
Heat reduces particle movement
Why should the thermometer bulb be placed in the ice during a melting investigation?
To measure the ice temperature accurately
To warm the thermometer
To make the ice melt faster
