Notes gb lab 08 endothermic and exothermic reactions
Lab 8Lab 8“Endo and ExoThe ReactionTwins”
The student will investigate andunderstand chemical changes inmatterThe student will be able to recognizethat some types of chemical reactionsrequire continuous input of energy(Endothermic) and others releaseenergy (Exothermic)
A chemicalreaction thatrequirescontinuous inputof energy.It feels cold. Endothermic reaction of barium hydroxideand an ammonium salt. Mix the twosolids; they react, and the productsdissolve in water of hydration. Thereaction flask may be passed around forstudents to feel how cold it is.
A chemicalreaction thatcontinuouslyreleasesenergy.It feels hot.Light Energy could be released inthe exothermic reaction taking placein things such as glow sticks.
Temperature change is anindicator or clue of a chemicalreactionThe temperature change happensbecause of the combination ofchemicals and energy
There are two types ofchemical reactions that causea temperature changeEndothermic ReactionsExothermic Reactions
Endothermic and ExothermicReactions are shown using a linegraph
The graph is written as change intemperature over time
In Endothermic Reactions,there is a decrease intemperature or a temperaturedrop.
Endothermic Reactions requiremore energy to break theoriginal chemical bonds andform new ones
Energy is absorbed from theenvironment through acontinuous input of energy andthe product feels coldCold Packs