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Exothermic and endothermic reactions
Identify that an exothermic reaction releases thermal energy to the environment, resulting in a rise in the temperature of the surroundings.
8
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80
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56
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90 min
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CambridgeIGCSEChemistryChemical energetics
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Exothermic and endothermic reactions outcomes8 objectives
- Identify that an exothermic reaction releases thermal energy to the environment, resulting in a rise in the temperature of the surroundings.
- Identify that an endothermic reaction absorbs thermal energy from the environment, causing a drop in the temperature of the surroundings.
- Analyze reaction pathway diagrams that illustrate both exothermic and endothermic reactions.
- Recognize that the change in thermal energy during a reaction is termed the enthalpy change (H), where H is negative for exothermic reactions and positive for endothermic reactions.
- Define activation energy (Ea) as the minimum energy required for colliding particles to undergo a reaction.
- Create and label reaction pathway diagrams for exothermic and endothermic reactions based on provided information, including reactants, products, enthalpy change (H), and activation energy (Ea).
- Acknowledge that breaking bonds is an endothermic process while forming bonds is exothermic, and describe the enthalpy change of a reaction in terms of these processes.
- Determine the enthalpy change of a reaction by utilizing bond energies.
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