Energy Transfer in Reactions (AQA GCSE Chemistry Combined Science): Flashcards
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Practise the cards
12 cards from this deck
System in a chemical reaction
System in a chemical reaction
The reaction being studied
Surroundings in a chemical reaction
Surroundings in a chemical reaction
Everything outside the reaction (container, air, etc.)
Principle of conservation of energy
Principle of conservation of energy
Energy cannot be created or destroyed, only transferred
Total energy of the universe during reactions
Total energy of the universe during reactions
Remains constant (conserved)
Exothermic reactions
Exothermic reactions
Reactions that release energy to the surroundings
Temperature change in exothermic reactions
Temperature change in exothermic reactions
Temperature goes up
Endothermic reactions
Endothermic reactions
Reactions that absorb energy from the surroundings
Temperature change in endothermic reactions
Temperature change in endothermic reactions
Temperature goes down
How to tell if a reaction is exothermic or endothermic
How to tell if a reaction is exothermic or endothermic
Measure the temperature change
Activation energy
Activation energy
Minimum energy needed for bonds to break
Activation energy on a reaction profile
Activation energy on a reaction profile
Difference between reactants and highest point on curve
If energy is less than activation energy
If energy is less than activation energy
Reaction doesn't happen