Exothermic and endothermic Flashcards
Define the term exothermic
They release energy so surroundings get hot
Define the term endothermic
Reactions absorb energy so surrounding get cold
Examples of exothermic reactions
Combustion
Neutralisation of strong acid
Rusting of iron
Respiration
Examples of endothermic reaction
Thermal decomposition
Photosynthesis
Dissolving ionic compounds
Sherbet
How does energy affect bonds being made and Brocken
When made bonds absorb the energy but when broke they let out energy
What does delta H mean
The change in thermal energy
How do you know if the reaction is exothermic
If the reactants have more energy than the products
On a graph how can you tell the reaction is exothermic
The reactants are above the products
How do you know the reaction is endothermic
Where the reactants have less energy than the products
When drawing an energy level diagram what is on the x and y axis
Y is energy
X is course of reaction
What is delta H if the reaction is exothermic and endothermic
Exothermic it is negative
Endothermic it is posotive
What is activation energy
The energy needed to start the reaction
How do You calculate energy change
Break - make
