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

Starter quiz

What are the three states of matter?
- solid state ✓
- ice state
- water state
- liquid state ✓
- gas state ✓
______ is the process when a liquid changes into a gas.
- 'evaporation' ✓
Match the process to whether it happens due to heating or cooling.
- evaporation
  
  ⇔
  
  heating ✓
- condensation
  
  ⇔
  
  cooling ✓
What is the name of the process that causes water droplets to form from water vapour in the air?
- evaporation
- condensation ✓
- melting
- freezing
______ is the name of the process that causes water in its liquid state to turn into ice.
- 'Freezing' ✓
Which two processes causes ice to change state to become water and water vapour?
- freezing and melting
- melting and condensation
- evaporation and condensation
- melting and evaporation ✓

Exit quiz

When a substance _________, it often produces a flame.
- evaporates
- melts
- condenses
- burns ✓
Which of these are needed for burning to take place?
- matches
- fuel ✓
- oxygen ✓
- heat ✓
- low temperature
Match the type of change to the description.
- reversible
  
  ⇔
  
  can be changed back again ✓
- irreversible
  
  ⇔
  
  cannot be changed back again ✓
When things burn …
- new materials are usually formed. ✓
- the original materials are kept.
- some new materials are formed but the original materials can be recovered.
Burning is an example of a ______________ change.
- irreversible ✓
- reversible
How could you learn about changes during burning?
- by planning investigations
- by making observations ✓
- by making predictions
- by drawing diagrams

Worksheet

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Lesson Details

Key learning points

When a substance burns, it produces a flame.
For burning to take place there has to be fuel, oxygen and a high enough temperature.
When things burn, new materials are usually formed.
Burning is a change that cannot be reversed.
Burning materials can be observed closely as they change over time.

Common misconception

Burning, heating and melting are the same. Smoke and water vapour are the same.

Slides teach that heating and melting are reversible changes because the original materials can be recovered but that, with burning, the original materials cannot be recovered. The difference between smoke and water vapour is also taught.

Keywords

Burn - To burn is to be on fire.
New material - A new material is formed when a starting material goes through an irreversible change.
Irreversible reaction - 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.