Changing temperature
Lesson details
Learning outcome
I can describe what happens to the particles that make up a solid or liquid when the temperature changes.
Key learning points
- If left for long enough, all objects in a room will reach the same temperature as the room.
- Heating a solid makes its particles vibrate more quickly.
- Heating a liquid makes its particles move around more quickly.
- Heating a solid or liquid causes the separation of its particles to increase.
- Heating a solid or liquid causes it to expand.
Keywords
Expand - to increase in volume
Contract - to decrease in volume
Particle - the smallest part of a substance
Vibrate - to repeatedly and regularly move back–and–forth
Common misconception
Pupils often think that the temperature of larger ice cubes is colder than smaller ones because they take longer to melt.
Emphasise that both a small and large ice cube are at the same temperature when they are in the same freezer.
Teacher tip
Most schools have sets of equipment to demonstrate the expansion of a solid, such as a bar and gauge, or a ball and hoop. Contraction of a solid can be demonstrated with a ‘bar-breaker’ apparatus.
Equipment
For demonstration of expansion and contraction: bar and gauge; bar-breaker apparatus; ball and hoop; flask of coloured liquid with capilliary tube to show expansion of a warmed liquid.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.The temperature of pure boiling water is °C.
Q2.Human body temperature is normally about °C.
Q3.What is the name of the temperature at which water changes from its solid state into its liquid state?
Q4.At what temperature does pure water freeze, compared to the temperature at which pure water melts?
Q5.To measure temperature of a beaker of water, the water is stirred and the of a thermometer is put into the middle of it.
Q6.Which of the following describes the particles in iron in its solid state?
Assessment exit quiz
6 Questions
Q1.What does increasing the temperature of a metal in the solid state do to the particles it is made from?
Q2.Why does a solid expand at higher temperatures?
Q3.In how many directions (out of length, width and height) does a metal bar expand when its temperature increases?
Q4.Two different sized blocks of pure solid water (ice) are removed from a freezer at the same time. Which block of ice melts at the lowest temperature?
Q5.Why does a liquid expand when it is heated to a higher temperature?
Q6.Sort the following statements into the correct order to describe how a thermometer measures the temperature of some hot water.
To help you plan your 7 science lesson on: Changing temperature, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 7 science lesson on: Changing temperature, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 science lessons from the Heating and cooling unit, dive into the full secondary science curriculum, or learn more about lesson planning.