In an exothermic reaction, heat is released and the temperature goes up.
We mixed hydrogen peroxide with yeast to create an exothermic reaction.
Fritz was pretty freaked out by it because the bubbles were heaving like it was alive and breathing.
The temperature of the mixture went up quite dramatically.
The cup got very, very hot.
In an endothermic reaction, heat is absorbed and the temperature goes down.
We mixed lemon juice with baking soda to create an endothermic reaction.
It bubbled up a whole lot and Cameron had to run the cup to the kitchen to avoid making a mess.
The temperature of the mixture went down and the cup got very, very cold.