5.1: Exothermic and endothermic reactions

Question 1

What is an endothermic reaction?

Answer 1

An​ ​endothermic​ ​reaction​ ​is​ ​one​ ​that​ ​takes​ ​in

energy​ ​from​ ​the​ ​surroundings​ ​so​ ​the​ ​temperature of​ ​the​ ​surroundings​ ​decreases.

Question 2

What is an exothermic reaction?

Answer 2

An​ ​exothermic​ ​reaction​ ​is​ ​one​ ​that​ ​transfers​ ​energy​ ​to the​ ​surroundings​ ​so​ ​the​ ​temperature​ ​of​ ​the​ ​surroundings increases.

Question 3

What is the activation energy?

Answer 3

The minimum​ ​amount​ ​of​ ​energy​ ​that​ ​particles​ ​must​ ​have to​ ​react.

Question 4

How can you tell if a reaction is exo/endothermic

Answer 4

● Energy​ ​taken​ ​in​ ​to​ ​break​ ​>​ ​energy​ ​released​ ​when​ ​formed​ ​=​ ​​ENDOTHERMIC
● Energy​ ​taken​ ​in​ ​to​ ​break​ < energy released when formed = EXOTHERMIC ​