Energy Changes Flashcards
Where do exothermic reactions transfer energy
Reacting molecules to the surroundings.
Examples of an exothermic reactions
Combustion
Certain oxidation reactions
Neautralisation
How much energy do the products have compared to the reactants in exothermic reactions?
The products have less energy than the reactants
How do you find out the amount of energy taken from surroundings in exothermic reactions on and energy profile diagram?
The difference between the reactants and the products energy (y axis)
Where can you find the energy change on an energy profile graph?
The difference between the products and the reactants.
What are two uses for exothermic reactions?
Hand warmers and self heating cans
What happens to the surroundings when an endothermic reaction takes place?
They get colder
What is an example of an endothermic reaction?
Thermal decomposition
What has to happen for a reaction to occur
Particles collide with each other with sufficient energy
What is the definition of activation energy?
The minimum amount of energy that particles must have in order to react
Where is the activation energy on an energy profile graph
Between the reactants and the peak of the curve
What are the bond energies in terms of end and exo reactions
When we break a chemical bond that requires energy (endothermic) but when we break a bond that releases energy (exothermic)
What does the energy value tell us
The energy required to break the bond
