energy changes Flashcards
1
Q
exothermic reactions
A
release energy - get hot
ex = out (exist)
thermic = relating to heat
2
Q
endothermic reactions
A
absorb energy - gets cold
en = in (entrance)
thermic = relating to heat
3
Q
examples of exothermic reactions
A
- combustion
- respiration
- neutralisation of acids with alkalis
- reactions of metals with acids
- the thermic process
3
Q
examples of exothermic reactions
A
- combustion
- respiration
- neutralisation of acids with alkalis
- reactions of metals with acids
- the thermic process
3
Q
examples of exothermic reactions
A
- combustion
- respiration
- neutralisation of acids with alkalis
- reactions of metals with acids
- the thermic process
3
Q
examples of exothermic reactions
A
- combustion
- respiration
- neutralisation of acids with alkalis
- reactions of metals with acids
- the thermic process
4
Q
examples of endothermic reactions
A
- thermal decomposition eg. calcium carbonate in the blast furnace
- photosynthesis
- some types of electrolysis
5
Q
activation energy
A
all reactions need a certain amount of energy to get started, this is called activation energy. activation energy is needed to start breaking bonds of reactions
6
Q
bond energy
A
bond energy is the amount of energy needed to break or make a bond
