Reactions That Release or Absorb Heat
Distinguish between exothermic reactions (release energy, temperature rises) and endothermic reactions (absorb energy, temperature falls), with everyday and industrial examples
Typical age: 12–13 years
“If your child shook a sports cold pack to activate it and it got cold, or lit a match and it got hot, could they explain what type of reaction is happening in each case and why one gets hot while the other gets cold?”
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Needs first
- Energy can't be created or destroyed
Conservation of energy in physical systems connects to exothermic/endothermic reactions — energy is conserved in chemical systems too
- How Materials Change State
Energy changes during changes of state (endothermic melting, exothermic freezing) extend the changes-of-state model
- Types of Chemical Reaction
Energy changes are a property of chemical reactions — understanding reaction types gives context
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