C7 Energy Changes Flashcards
1
Q
What is an exothermic reaction?
A
Reaction which releases thermal energy to it’s surroundings.
products will always have less energy than reactants
2
Q
What is an endothermic reaction?
A
Reaction which absorbs thermal energy from its surroundings
products have more energy than reactants
3
Q
How do catalysts speed up the rate of chemical reactions?
A
They produce an alternative path with lower activation energy, more particles can exceed lower activation energy so that more successful collisions per second.
4
Q
Bond breaking is a …..
A
…endothermic reaction
5
Q
Bond making is a ….
A
…. exothermic reaction
6
Q
What is bond energy measured in?
A
J/mol
7
Q
Why is the mass of hydrogen almost never measured?
A
Because it’s mass is too light to measure, therefore gas syringe is used instead
