Endothermic reactions (AQA GCSE Chemistry Combined Science): Flashcards
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14 cards from this deck
What is an endothermic reaction?
What is an endothermic reaction?
A reaction that takes in energy from surroundings
Meaning of 'endo'
Meaning of 'endo'
In or inside
Sign of endothermic reaction
Sign of endothermic reaction
Temperature drops, surroundings get colder
Products vs reactants energy (endothermic)
Products vs reactants energy (endothermic)
Products have more energy than reactants
What is thermal decomposition?
What is thermal decomposition?
Compounds break down when heated
Thermal decomposition example
Thermal decomposition example
breaks into and
Calcium carbonate decomposition equation
Calcium carbonate decomposition equation
Citric acid + sodium hydrogen carbonate
Citric acid + sodium hydrogen carbonate
Gets colder (endothermic), used in cold packs
What are instant cold packs used for?
What are instant cold packs used for?
Treating sports injuries
Instant cold pack components
Instant cold pack components
Water and chemical (e.g. ammonium nitrate) separated
How to activate instant cold pack
How to activate instant cold pack
Squeeze to break barrier and mix chemicals
Cold pack temperature drop
Cold pack temperature drop
10-15°C instantly
Why are cold packs single-use?
Why are cold packs single-use?
Reaction cannot be reversed easily
Energy diagram: products (endothermic)
Energy diagram: products (endothermic)
Higher than reactants