5.5.1.1 Energy Transfer During Exothermic and Endothermic Reactions Flashcards
1
Q
What happens to energy in chemical reactions?
A
- it is conserved
2
Q
What is the amount of energy in the universe at the end of a chemical reaction?
A
- same as before the reaction takes place
3
Q
What does it mean if a reaction transfers energy to the surroundings?
A
- product molecules will have less energy than the reactants
- by the amount transferred
4
Q
What is an exothermic reaction?
A
- one that transfers energy to the surroundings
- temperature of surroundings increases
5
Q
What are examples of exothermic reactions?
A
- combustion
- many oxidation reactions
- neutralisation
6
Q
What are everyday uses of exothermic reactions?
A
- self-heating cans
- hand warmers
7
Q
What is an exothermic reaction?
A
- a reaction that takes in energy from surroundings
- temperature of surroundings decreases
8
Q
What are examples of endothermic reactions?
A
- thermal decomposition
- reaction of citric acid and sodium hydrogencarbonate
9
Q
What are everyday uses of endothermic reactions?
A
- sports injury packs
