Standard+5c

In chemical reactions, there is usually a change in energy. If energy is released, the reaction is said to be exothermic. The energy is typically released as heat. If the energy is absorbed, the reaction is said to be endothermic. The energy is typically absorbed as heat from nearby matter, which therefore cools. A convenient way to demonstrate that chemical reactions release or absorb heat is the application of the hot packs or cold packs used for athletic injuries. The change in temperature produced by those packs may be the result of a chemical reaction, or it may be caused by a “heat of solution” and not by a chemical reaction. For example, dissolving is considered a physical and not a chemical change because the compound may be recovered, unchanged chemi cally, by evaporation.
 * //Students know//** **//chemical reactions usually liberate heat or absorb heat.//** (Q. 51, 52, 53)

ACTIVITY: 1) Write a summary of the above information in your journal. 2) Read this information and summarize it: http://www.sciencebyjones.com/endoexothermic.htm 3) TAKE QUIZ HERE: https://www.quizlab.com/secured/authenticate_limited.cfm Click on "single class login", and input classword (tewinkle(#ofclass): ex. if you are in period 2, your classword is tewinkle2, Your password is first letter of name and as much of last name as fits (ex: htangen).