5.5.1.3 The Energy Change of Reactions Flashcards
1
Q
What must happen to energy during a chemical reaction?
A
- must be supplied to break bonds in reactants
2
Q
When is energy released in a reaction?
A
- once bonds in products are formed
3
Q
How is energy that is needed to break bonds and energy released when bonds form calculated?
A
- from bond energies
4
Q
How do you calculate overall energy change?
A
- sum of energy taken in to break bonds - sum of energy released to form bonds
5
Q
How can you tell if a reaction is endothermic based on energy?
A
- energy taken in to break bonds is greater than energy released when bonds form
- energy change
6
Q
How can you tell if a reaction is exothermic based on energy?
A
- energy taken in to break bonds is less than energy released when bonds form
- energy change
