Energy In Chemical Reactions Flashcards
(9 cards)
Q: What happens to energy during a chemical reaction?
A: It is either released to the surroundings or absorbed from them.
Q: What is an exothermic reaction?
A reaction that releases energy, usually as heat
Q: What is an endothermic reaction?
A reaction that absorbs energy, causing the surroundings to cool
- Q: What are the surroundings in a chemical reaction?
Everything outside the reacting substance — e.g., the container, the air.
Q: Is combustion an exothermic or endothermic reaction?
Exothermic — it releases heat and light.
- Q: Is thermal decomposition exothermic or endothermic?
Endothermic — heat is needed to break down the compound.
Q: Is neutralisation exothermic or endothermic?
Exothermic — heat is released when acid and alkali react
Q: Is photosynthesis endothermic or exothermic?
Endothermic — it takes in light energy
Q: How can you detect energy changes in a reaction?
By measuring the temperature change of the surroundings.
