Rusting: an irreversible change | Science | Quizalize & Oak National Academy

Starter quiz

What is a reversible change?

A change which can be undone or changed back to its original state. ✓

A change which cannot be undone or changed back to its original state.
Evaporation happens faster when the temperature is ...

warmer. ✓

cooler.
Match the reverse process of each change of state.

melting

⇔

freezing ✓

condensation

⇔

evaporation ✓
At temperatures between 0°C and 100°C, water is in ______ state.

'liquid' ✓
Which gas from the air is used during burning?

carbon dioxide

oxygen ✓

air
Match the process to the change of state.

evaporation

⇔

when a liquid changes to a gas ✓

melting

⇔

when a solid changes to a liquid ✓

freezing

⇔

when a liquid changes to a solid ✓

condensation

⇔

when a gas changes to a liquid ✓

______ forms when iron is exposed to water and oxygen and is reddish brown in colour.

'Rust' ✓
Which skills are needed to monitor changes in materials as they rust?

predicting

drawing

observation ✓

modelling

concluding
The changes observed in rusting materials ...

are often very slow. ✓

are instant.

happen very quickly.
What texture is rust?

smooth

rough ✓

squishy

soft
Which of these are needed for rust to form?

iron or steel ✓

aluminium

oxygen ✓

water ✓

carbon dioxide
Rusting is an ______ change because it cannot be undone or changed back.

'irreversible' ✓

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Rust is reddish brown in colour and has a rough texture.
Rust is a new material that is formed when iron or steel is exposed to oxygen in the air and water.
Rusting is an irreversible change whereby the original material cannot easily be recovered.
Rusting materials can be looked at closely as they change over time, using observation skills.

Rusting happens immediately when the correct conditions are present and it only happens in water.

Teaching slides explain that rusting is not instant and that moisture from the air provides enough water for the process to take place.

Rust - Rust is a reddish brown material which forms when iron or steel reacts with water and oxygen from the air.
Metal - Most metals are strong, hard and shiny materials.
Irreversible change - If a change is irreversible, it cannot be undone or changed back to its original state.
Observe - To observe is to look very closely and use other senses too.