Energy Changes Flashcards
1
Q
What is enthalpy change?
A
Net amount of heat energy given out or taken in during a chemical reaction.
+ve 🔺H Endothermic reaction
-ve 🔺H Exothermic reaction
2
Q
What is activation energy?
A
Activation energy is the minimum energy that reacting particles require to start a chemical reaction. Minimum energy that the reacting particles must have to break bonds in order for them to react to form products
3
Q
What is an exothermic reaction? Explain in terms of bonding
A
Energy absorbed to break bonds in reactants is LESS THAN energy released to form bonds products.
- Heat is given out to surroundings
- Increase in surrounding temp
- Negative🔺H
- Products have lower energy than reactants
4
Q
What is an endothermic reaction?
A
Energy absorbed to break bonds in reactants is GREATER THAN energy released to form bonds in products.
- Heat is taken in from surroundings
- Decrease in surrounding temp
- Positive🔺H
- Products have higher energy than reactants
