Exothermic and Endothermic Reactions Flashcards
In endothermic, which has a higher energy level, reactants or products?
Products have a higher energy level than reactants.
In exothermic, which has a higher energy level, reactants or products?
Reactants have a higher energy level than products.
Where is energy transferred to in an endothermic reaction? What happens to the surrounding temperature?
From the surroundings to the reaction, so the surrounding temperature decreases.
Where is energy transferred to in an exothermic reaction? What happens to the surrounding temperature?
To the surroundings, so the surrounding temperature increases.
Is energy released or taken in in an exothermic reaction?
Energy is released.
Is energy released or taken in in an endothermic reaction?
Energy is taken in.
In terms of bonds, what happens to the overall energy of an exothermic reaction?
The energy released making new bonds is greater than the energy taken in breaking existing bonds.
In terms of bonds, what happens to the overall energy of an endothermic reaction?
The energy needed to break existing bonds is greater than the energy released making new bonds.
Which reaction involves breaking bonds in reactants?
Endothermic.
Which reaction involves making bonds in products?
Exothermic.
Give two examples of endothermic reactions.
- Thermal decomposition
- Sports injury packs
Give three examples of exothermic reactions.
- Combustion
- Hand warmers
- Neutralisation
