Exothermic And Endothermic Reactions Flashcards
What is an exothermic reaction
A reaction that transfers energy to the surroundings
What is an endothermic reaction
A reaction that takes in hear from the surroundings
An example of an exothermic and endothermic reaction
Hydrochloric acid & magnesium (exothermic)
Water and sodium thiosulfate (endothermic)
What is activation energy
Minimum amount of energy the reactant particles need in order to collide and react
How can you tell on a graph when a reaction is exothermic
When the energy change is negative as energy is lost to the surroundings
How can you tell on a graph when a reaction is exothermic
When the energy change is positive as energy gained from the surroundings
What is bond energy
Energy needed to break a bond
How to work out the bond energy
Total energy needed - the total energy released
(If the value is negative it’s exothermic and if it’s positive it’s endothermic)
