C5 chemical energetics Flashcards
1
Q
energy transfer in exothermic reaction
A
- transfer thermal energy to surroundings
- increase temp of surroundings
2
Q
energy transfer in endothermic reaction
A
- takes in thermal energy from surroundings
- decrease temp of surroundings
3
Q
endothermic or exothermic
A
exothermic
4
Q
endothermic or exothermic
A
exothermic
5
Q
what is the enthalpy change
A
- transfer of thermal energy during a reaction
- ΔH
6
Q
what is ΔH in exothermic reaction
A
negative
7
Q
what is ΔH in endothermic reaction
A
positive
8
Q
define activation energy
A
- minimum energy
- that colliding particles must have to react
9
Q
what aspects are needed in a reaction pathway diagram
A
- reactants
- products
- overall energy change in reaction (ΔH)
- activation energy (Ea)
10
Q
what happens to bonds in an endothermic reaction
A
endothermic is bond breaking
11
Q
what happens to bonds in an exothermic reaction
A
exothermic is bond making
