Heating and cooling
I can explain why some changes of state are exothermic and some are endothermic.
Heating and cooling
I can explain why some changes of state are exothermic and some are endothermic.
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Lesson details
Key learning points
- Heating transfers energy into a substance and can cause it to melt, evaporate or boil.
- Melting, evaporation and boiling are endothermic.
- As it cools, a substance transfers energy into the surroundings by heating and it may condense or freeze.
- Condensing and freezing are exothermic.
Keywords
Endothermic - When a substance transfers energy in from the surroundings, e.g. melting, boiling and evaporating.
Exothermic - When a substance transfers energy out to the surroundings by heating, e.g. condensing and freezing.
Common misconception
Energy can appear and disappear.
Remind students about the conservation of energy.
To help you plan your year 8 science lesson on: Heating and cooling, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 8 science lesson on: Heating and cooling, 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.
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Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is the state of water at room temperature (about 20°C)?
Q2.Which of these is not a characteristic of a solid state substance?
Q3.Water will melt at ℃?
Q4.In what state does water evaporate ?
Q5.What happens to the volume of a substance when it condenses?
Q6.How does the energy of particles compare between a block of ice at -10°C and a glass of water at 20°C?
Assessment exit quiz
6 Questions
Q1.What type of process is boiling?
Q2.When energy is transferred out from a substance to its surroundings, this process is termed...
Q3.Which thermometer shows the temperature at which water is in the liquid state?
Q4.Evaporation is an endothermic process because energy is transferred from the surroundings into the substance.
Q5.Match the statements below to what is happening in terms of energy, particle movement and particle arrangement as a substance is heated over time.
particles are in fixed positions, and vibrate more
particles becoming randomly arranged and can move
particles in liquid state move past each other and faster
energy used to overcome liquid particle attractive forces
particles in gas state use energy to move faster