Bond energies (Edexcel GCSE Chemistry): Flashcards
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12 cards from this deck
What happens to bonds in chemical reactions?
What happens to bonds in chemical reactions?
Bonds are broken and new bonds are formed
Type of reaction that absorbs energy
Type of reaction that absorbs energy
Endothermic
Type of reaction that releases energy
Type of reaction that releases energy
Exothermic
Energy comparison in endothermic reactions
Energy comparison in endothermic reactions
Energy to break bonds > energy released forming bonds
Sign of overall energy change in endothermic reactions
Sign of overall energy change in endothermic reactions
Positive
Effect on surroundings in endothermic reactions
Effect on surroundings in endothermic reactions
Surroundings feel cooler
Energy comparison in exothermic reactions
Energy comparison in exothermic reactions
Energy released forming bonds > energy to break bonds
Sign of overall energy change in exothermic reactions
Sign of overall energy change in exothermic reactions
Negative
Effect on surroundings in exothermic reactions
Effect on surroundings in exothermic reactions
Surroundings feel warmer
Sign of energy when breaking bonds
Sign of energy when breaking bonds
Positive
Sign of energy when forming bonds
Sign of energy when forming bonds
Negative
How to identify exothermic from calculation result
How to identify exothermic from calculation result
Overall energy change is negative