P5 Science Topics

What process occurs when liquid turns into gas?

• Condensation

• Evaporation

• Freezing

• Melting

Answer explanation

Boiling and evaporation are the processes that allow liquids to become gases.

What process occurs when gas turns into liquid?

• Condensation

• Evaporation

• Freezing

• Boiling

What are the two processes occurring in a water cycle?

• Boiling and Condensation

• Freezing and Evaporation

• Evaporation and Condensation

• Condensation and Melting

Answer explanation

Evaporation - water in water bodies gain heat to become water vapour in the air

Condensation - water vapour in air loses heat and condenses to form water droplets (clouds)

Identify the change of state when water turns into ice.

• Solid to liquid

• Liquid to gas

• Gas to Solid

• Liquid to Solid

Identify the change of state when water vapour turns into water droplets.

• Liquid to gas

• Gas to liquid

• Liquid to solid

• Solid to liquid

The table shows the freezing and boiling points of an unknown substance, M.

What is the state of substance M at 80°C?

• Solid

• Liquid

• Gas

Answer explanation

80°C is above the boiling point of M. M will be in the gaseous state.

An ice cube is left on a metal block as shown below. Which of the statements is correct?

A: Temperature of the ice increases.

B: The metal block is losing heat to the ice cube.

C: The water is gaining heat from the surroundings.

• A only

• B only

• A and C only

• B and C only

Answer explanation

A: Temperature of the ice increases - false as melting occurs at a fixed temperature.

B: The metal block is losing heat to the ice cube - true as ice gains heat from both the block and surroundings to melt.

C: The water is gaining heat from the surroundings - true.

Ain dropped some ice cubes into a glass container of water.

Describe the change in state of the ice cubes after 30 minutes.

• solid to liquid

• liquid to gas

• gas to liquid

• liquid to solid

Both towels are soaked with 50ml of water. Which towel will dry up first and why?

• Towel A, smaller exposed surface area

• Towel A, higher temperature

• Towel B, bigger exposed surface area

• Towel B, higher temperature

Which processes involve a heat gain?

• A

• B

• C