The Energy Change of Reactions (AQA GCSE Chemistry Combined Science): Flashcards
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Principle of conservation of energy
Principle of conservation of energy
Energy cannot be created or destroyed, only transferred
System in chemical reactions
System in chemical reactions
The chemical reaction being studied
Surroundings in chemical reactions
Surroundings in chemical reactions
Everything outside the reaction (container, environment)
Energy in exothermic reactions (reactants vs products)
Energy in exothermic reactions (reactants vs products)
Reactants have more energy than products
Temperature change in exothermic reactions
Temperature change in exothermic reactions
Temperature goes up
Examples of exothermic reactions
Examples of exothermic reactions
Combustion and neutralisation
Energy in endothermic reactions (reactants vs products)
Energy in endothermic reactions (reactants vs products)
Products have more energy than reactants
Temperature change in endothermic reactions
Temperature change in endothermic reactions
Temperature goes down
Examples of endothermic reactions
Examples of endothermic reactions
Photosynthesis and thermal decomposition
Bond energies definition
Bond energies definition
Energy stored within a chemical bond
Energy change when a chemical bond is made
Energy change when a chemical bond is made
Energy is released to the surroundings
Energy change when a chemical bond is broken
Energy change when a chemical bond is broken
Energy is absorbed from the surroundings
Formula for energy change
Formula for energy change
Energy change = Bonds broken - Bonds made
Negative energy change indicates
Negative energy change indicates
Exothermic reaction (energy released)
Positive energy change indicates
Positive energy change indicates
Endothermic reaction (energy absorbed)