Energy from reactions Flashcards
1
Q
What is energy usually measured in?
A
Joules
2
Q
How can the amount of energy released or absorbed by a reaction be measured?
A
By measuring the temperature change
3
Q
What is activation energy?
A
The minimum amount of energy needed to start a reaction
4
Q
Explain exothermic reactions
A
- Heat is given out
- The energy released making new bonds is greater than the energy needed to break bonds that were already ther
5
Q
Explain endothermic reactions
A
- Heat is taken in
- The amount of energy needed to break existing bonds is greater than the energy released from forming new bonds
6
Q
How do catalysts speed up reactions?
A
By providing an alternative route for the chemical reaction which requires a lower activation energy
