Exothermic and Endothermic reactions Flashcards
(11 cards)
What is an exothermic reaction
An exothermic reaction is one which gives out energy to the surroundings, usually in the form of heat and usually shown by a rise in temperature of the surroundings
What is an endothermic reaction
an endothermic reaction is one which takes in energy from the surroundings, usually in the form of heat and usually shown by a fall in temperature of surroundings
what do reaction profiles show
Reaction profiles show the energy levels of the reactants and products in a reaction.
You can use them to figure out if energy is released (exothermic) or taken in (endothermic)
What is shown on a reaction profile if the reaction is exothermic
The products are at a lower energy than the reactants. The difference in height represents the energy given out in the reaction
What is shown on a reaction profile if the reaction is endothermic
Products are at a higher energy than the reactants
The difference in height represents the energy taken in during the reaction.
What is on the y axis on a reaction profile
Energy
What is on the x axis for a reaction profile
It is the progress of reaction
What is the activation energy
The activation energy is the minimum amount of energy need for bonds to break and a reaction to start
Why is bond breaking endothermic
Energy is taken in the break bonds
Why is bond forming exothermic
because when bonds form energy is realised
How do you find the overall change in energy
Overall Energy Change= Energy required to break bonds - Energy released to form bonds
