1. Endothermic/Exothermic Processes & Reactions

2. Exothermic Endothermic Process Heat exiting a substance
Ex: water freezing
Physical change
Heat entering a substance
Ex: water evaporating
Reaction
Chemical reaction where energy is released in the form of light or heat
Feels hot – chemical bonds forming
Temp. change - warmer
Ex: Calcium & water
Chemical reaction that absorbs energy from its surroundings
Feels cold – chemical bonds breaking
Temp. change - colder
Ex: Vinegar & baking soda

3. Reaction #1 - Endothermic
Baking Soda & Citric Acid
Reaction #2 - Exothermic
Steel Wool & Vinegar
Reaction #3 - Exothermic
Calcium & Water
Reaction #4 - Endothermic
Baking Soda & Vinegar
Time Temperature (⁰C)
(sec.)
(min.)

4. Graph Results On one piece of graph paper.
Have a key to distinguish which line represents which reaction.