Sức mạnh của Nhiệt và Thảm họa Tự nhiên

What happens when ice is heated?

• It melts

• It freezes

• It evaporates

• It turns into ice

Which change is reversible?

• Burning paper

• Melting chocolate

• Baking a cake

• Breaking eggs

What tool do we use to measure temperature?

• Thermometer

• Ruler

• Stopwatch

• Compass

What happens to water when it is cooled below 0°C?

• It boils

• It turns into steam

• It freezes into ice

• It becomes warmer

Which process is irreversible?

• Melting wax

• Boiling water

• Burning wood

• Freezing fruit juice

What is the freezing point of water?

• 100°C

• 50°C

• 0°C

• 10°C

What happens to chocolate when it melts?

• It cannot return to its original shape

• It disappears

• It can be cooled and solidified again

• It catches fire

Among these, which is an example of heating causing an irreversible change?

• Melting butter

• Frying an egg

• Melting ice cream

• Boiling water

Why is boiling water a reversible change?

• Water turns into ice

• Water can evaporate

• Water vapor can condense back into water

• It disappears forever

What happens when a metal is heated?

• It turns into stone

• It expands

• It contracts

• It melts immediately