Exothermic and Endothermic Flashcards
How is energy transferred?
When chemical reaction occur, energy is transferred from the chemicals to or from the surroundings.
Exothermic reactions
Exothermic reactions are accompanied by a temperature rise. They transfer heat energy from the chemicals to the surroundings, i.e they give out heat energy.
Endothermic reactions
Endothermic reactions are accompanied by a fall in temperature. Heat energy if transferred from the surroundings to the chemicals , i.e they take in heat energy.
There are different amount of energy transferred in Endothermic and Exothermic reactions. True/False
False
How are atoms rearranged in a chemical reaction? And what does the particles have to do to do this?
atoms are rearranged as old bonds are broken and new bonds are formed.
For bonds to be broken, reacting particles must collide with sufficient energy.
What is activation energy?
The minimum amount of energy that the particles must have for a reaction to take place.
What is it called for the minimum amount of energy that the particles must have for a reaction to take place?
Activation energy
How can the energy changes in a chemical reaction be shown?
It can be shown by using an energy level diagram or reaction profile.
in an exothermic reaction:
- energy is given out to the surroundings
- the products have less energy that the reactants
in an endothermic reaction:
- energy is being taken in form the surroundings
- the products have more energy than the reactants
Exothermic and Endothermic reaction diagram
https://r.search.yahoo.com/_ylt=AwrEa4yUpwdkul0X.fqe3olQ;_ylu=c2VjA3NyBHNsawNpbWcEb2lkAzRkYWJlMDhkYzZjYzZlYWQ0Y2M4OGZmNWRlNzE5OTA2BGdwb3MDNARpdANiaW5n/RV=2/RE=1678252053/RO=11/RU=https%3a%2f%2fwww.quora.com%2fWhat-is-difference-between-endothermic-and-exothermic-reaction-if-both-require-activation-energy/RK=2/RS=rXD5byeNXQukR_MZvRK12Ih5F6g-
What does a catalyst do?
Reduces the activation energy needed for a reaction. This makes the reaction go faster.
diagram: in textbook pg 57
