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