1. Endothermic / Exothermic Lab

2. Part 1 – Baking Soda and Vinegar
Vinegar + Baking Soda
General Observations
Clear Liquid; Slightly cool
Bubbles occur; substance changes color; Solution feels colder
Exact Temperature
21oC
14oC
Vinegar
Vinegar + Baking Soda
General Observations
Exact Temperature

3. Part 1 – Analysis Questions
How do you know a reaction occurred?
Bubbles occurred
Substance changed color / consistency
Temperature decreased
How did the temperature of the vinegar change when combined with baking soda?
It decreased slightly
Why do you think this happened?
Answers can vary – Opinion question

4. Part 2 – Calcium Chloride and Water
General Observations
Clear; Room Temperature
Solution gets warmer immediately; No bubbles occur; Changes color slightly
Exact Temperature
21oC
32oC W
Water
Calcium Chloride and Water
General Observations
Exact Temperature

5. Part 2 – Analysis Questions
How do you know a reaction occurred?
Temperature increased
How did the temperature of the water change when combined with calcium chloride?
It increased significantly
Why do you think this happened?
Answers can vary – Opinion question

6. Part 1 & 2 Analysis Questions
What do you think endothermic means?
Answers can vary – Opinion question
What do you think exothermic means?

7. Part 1 & 2 Analysis Questions
List experimental errors

8. “What was Happening” Article
What does exothermic mean?
Gives off heat
Exo - means out
Thermal energy goes out
What does endothermic mean?
Uses heat
Endo – Means in
Thermal energy goes in

9. “What was Happening” Article
Reactants
Products
Baking Soda + Vinegar
_______ + ________ + ________
NaHCO3 + CH3COOH
Water + Carbon Sodium
Dioxide acetate
H2O + CO C2H3NaO2

10. “What was Happening” Article
Reactants
Products
_______ + ________
__________ + ___________
CaCl2 + H2O
CaO + 2 HCl
Calcium Water
chloride
Calcium Hydrochloric
Oxide Acid

11. “What was Happening” Article
What is a common use for calcium chloride?
Driveway Salt
Explain why calcium chloride would be helpful in the winter. Make sure you mention temperature changes and how this might help
Calcium chloride when it comes into contact with water releases heat which melts the ice around it