Exothermic & Endothermic Reactions (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards
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What is the system in chemistry?
What is the system in chemistry?
The specific chemical reaction being studied
What are the surroundings in chemistry?
What are the surroundings in chemistry?
Everything outside the reaction
Principle of conservation of energy
Principle of conservation of energy
Energy cannot be created or destroyed, only transferred
What happens to energy during chemical reactions?
What happens to energy during chemical reactions?
Absorbed from or released to the surroundings
Universe in chemistry
Universe in chemistry
Combination of system and surroundings
Total energy of universe during reactions
Total energy of universe during reactions
Remains constant
Exothermic reactions
Exothermic reactions
Release energy to the surroundings
Temperature change in exothermic reactions
Temperature change in exothermic reactions
Increases
Endothermic reactions
Endothermic reactions
Absorb energy from the surroundings
Temperature change in endothermic reactions
Temperature change in endothermic reactions
Decreases
How to tell if reaction is exo/endothermic
How to tell if reaction is exo/endothermic
Measure temperature changes
Activation energy
Activation energy
Minimum energy needed for bonds to break