Exothermic and Endothermic Reactions Flashcards
1
Q
What is a Endothermic reaction
A
- when more energy is supplied than is released
- more energy is taken in to break the bonds in the reactants than released by the bonds being formed in the products
- energy is absorbed
- Heat (energy) taken in
2
Q
What is a Exothermic reaction?
A
- More energy Is released the products were formed than energy as use to break the bonds in the reactants
more energy is released than supplied - energy is released
- heat (energy) -> malatang
3
Q
Results of Endothermic reactions
A
- temperature of the substance drops
- product feels cold
- Reactant + energy (heat) -> products
4
Q
Results of Exothermic Reactions
A
- Temperature of the substance increases
- product feels hot
- reactants -> products + energy (heat)
5
Q
Explain energy change in reactions
A
- Energy is stored in the chemical bonds of a substance
- When a chemical reactions occurs it always involve energy changes
- This is because making bonds and breaking bonds involve energy change
6
Q
What is activation energy?
A
The energy required to break the bonds in the reactants for a chemical reaction to occur
7
Q
Energy must be ______ to break chemical bonds of reactants
A
supplied
8
Q
Energy is _______ when new chemical bonds are made in the products
A
released
9
Q
How do you measure heat in a experiment?
A
- by measuring the change in temperature of a known amount of water
10
Q
What reaction releases more energy than used?
A
Exothermic reaction
11
Q
What reaction uses more energy than released?
A
Endothermic reactions
