Chapter 15 - Energy changes Flashcards
1
Q
What is an exothermic reaction ?
A
A reaction in which heat is given out
2
Q
What is an endothermic reaction ?
A
A reaction in which heat is taken in
3
Q
Draw the diagram for an endothermic reaction
A
required to learn on the spec
4
Q
Draw the diagram for an exothermic reaction
A
required to learn on the spec
5
Q
What is activation energy ?
A
Activation energy is the minimum amount of energy needed for a reaction to occur
6
Q
What does bond breaking do ?
A
Bond breaking takes in energy
7
Q
What does bond making do ?
A
Bond making releases energy
8
Q
How do you calculate the energy change in a reaction ?
A
- calculate the total bond energyfor all the bonds broken
- calculate the total bond energy for all the bonds made
- use the equation
9
Q
What is the equation to find the energy change ?
A
energy taken in by breaking bonds in reactants - energy released making bonds in products
