Boiling and condensing
I can measure the boiling point of water and explain what happens to particles when a substance in the gas state condenses.
- Year 7
Boiling and condensing
I can measure the boiling point of water and explain what happens to particles when a substance in the gas state condenses.
Lesson details
Key learning points
- The condensing point and boiling point are the same temperature for a substance, for water this is 100°C.
- Steam is water in the gas state.
- A substance increases in volume in the gas state when boiled.
- A substance decreases in volume in the liquid state when condensed.
- Particles move further apart when boiled and move closer together when condensed.
Keywords
Boiling - when a substance in the liquid state is heated, and gas bubbles are formed.
Boiling point - the temperature at which a substance changes from a liquid state to a gas state.
Condensing - when a substance in the gas state is cooled and changes to a liquid state.
Condensing point - the temperature at which a substance changes from a gas state to a liquid state.
Common misconception
Pupils tend to think that all gases are made of air. That gases contain no particles.
Ensure that pupils gain the knowledge that the particles are the substance and between the particles there is nothing.
Equipment
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Water in the solid state is called...
Q2.Which of the following statements is true about particles in the gas state?
Q3.Put the following states of matter in order of decreasing particle movement.
Q4.What laboratory equipment is used to measure the boiling point of a substance?
Q5.What is in-between the particles in the gas state?
Q6.Place these processes in the correct order as they would occur when heating water.
Assessment exit quiz
6 Questions
Q1.What is the boiling point of water?
Q2.Match the terms to the descriptions.
