Year 9 · Autumn First Half

Chemistry

3 lessons from 1 unit.

Unit C7 · lessons 1 to 3 of 4

Every reaction moves energy. Some push it out into the room and some pull it in, and a thermometer in the beaker is how you tell which. This unit is about which way the energy goes, why nothing is ever created or destroyed doing it, and how much a leaking beaker costs you when you try to measure it.

01Energy and changes of stateModelKeep heating a beaker of melting ice and the thermometer refuses to move. The energy is still going in — so where is it going?Open this lesson
02Exothermic reactionsProcessEvery fire you have ever seen gave out far more energy than the match that started it. Nobody keeps feeding it energy — so where does the heat come from?Open this lesson
03Endothermic reactionsContrastTwo powders, both at room temperature, stirred together in a beaker. Thirty seconds later the thermometer has fallen from 20 °C to 12 °C, and nothing was cooled.Open this lesson

Back to all three sciences this half term The whole KS3 Chemistry course