Topic 5 Exothermic and endothermic reactions Flashcards
1
Q
What is an exothermic reaction
A
Transfers energy to the surroundings usually by heating
2
Q
Examples of exothermic reaction
A
Combustion
Neutralisation reactions
Many oxidation reactions
Hand warmers - use oxidation of iron with the air
Self heating cans
3
Q
What is an endothermic reaction
A
Takes I’m energy from the surroundings
4
Q
What effect does endothermic reaction have on the surroundings
A
The temperature decreases
5
Q
Are endothermic reactions more or less common
A
Less common
6
Q
Examples of endothermic reaction
A
Reaction between citric acid and sodium hydrogencarbonate
Thermal decomposition
Sports injury packs
Photosynthesis
7
Q
Common endothermic reactions
A
Sport injury packs
8
Q
What does calcium carbonate form when heated
A
Carbon dioxide and quicklime
CO2 + CaO
