ice melting and boiling of water | Baamboozle - Baamboozle

Which statement about changes of state is correct?

No new substance is formed

A new substance is produced

The particles stop moving

Why should a lid not be tightly closed when heating water?

To allow steam to escape safely

To make water boil faster

To stop evaporation

Which conclusion is correct if ice melts faster in a warmer room?

Higher temperature increases melting rate

Ice melts only at 0°C

Cold air produces heat

What happens to the mass of ice after it melts?

It stays the same

It increases

It decreases

Which factor can affect the boiling point of water?

Height above sea level

Colour of the beaker

Amount of water

Why should temperature be measured at regular time intervals?

To observe changes clearly

To finish the experiment quickly

To avoid using a graph

What change of state occurs when boiling water becomes steam?

Liquid to gas

Solid to liquid

Gas to liquid

Which safety rule should be followed when heating water?

Use heat-resistant gloves or tongs

Hold the beaker with bare hands

Fill the beaker to the top

Why does water boil faster in a metal container?

Metal conducts heat better

Metal absorbs cold

Metal lowers the boiling point

What observation shows water is close to boiling?

Small bubbles form at the bottom

Ice forms in the water

The temperature drops suddenly

What does a flat line on a temperature–time graph during melting show?

The temperature stays constant during melting

The temperature increases quickly

The ice cools down

Which result shows that a fair test has been carried out?

Only one variable is changed

All variables are changed

No measurements are taken

What effect does adding salt have on ice in an investigation?

It lowers the melting point of ice

It raises the melting point

It stops melting completely

What happens to the temperature just before ice starts to melt?

It rises to 0°C

It falls below 0°C

It stays at room temperature

Why should the thermometer bulb be placed in the ice during a melting investigation?

To measure the ice temperature accurately

To make the ice melt faster

To warm the thermometer

What is the correct conclusion from investigating melting and boiling?

Heat causes a change of state

Heat destroys matter

Heat reduces particle movement

What should be recorded during an investigation of boiling water?

Temperature at regular time intervals

Colour of the container

Size of the beaker

Which change of state is reversible?

Melting ice into water

Burning paper

Rusting iron

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

What happens to water particles when water boils?

They gain energy and move far apart

They lose energy and slow down

They stop moving

Which piece of equipment is safest to use when heating water?

A beaker

A ruler

A thermometer case

What is the boiling point of pure water at sea level?

100°C

0°C

50°C

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

Why does crushed ice melt faster than a large ice cube?

It has a larger surface area

It is colder

It has more mass

What happens to the temperature of ice while it is melting?

It remains constant until all ice melts

It increases steadily

It decreases

What change of state occurs when ice melts?

Solid to liquid

Liquid to gas

Solid to gas

At what temperature does pure ice begin to melt?

0°C

50°C

100°C

Which variable should be kept the same to make an ice melting investigation fair?

The amount of ice used

The time taken to melt

The temperature recorded

What happens to particles in ice as it melts?

They gain energy and move past each other

They lose energy and stop moving

They change into gas

Why is a thermometer used during an investigation of melting ice?

To measure the temperature change

To stir the ice

To make the ice melt faster