Energy Changes Lab

Part 1:  Reaction between HCl and NaOH Data Table

Temperature of mixture (C⁰): 

Temperature of HCl before mixing:           

Difference between two temperatures:    

Increase or decrease in temperature ?:

Exothermic or endothermic ?:

Part 2:  Reaction between NH₄NO₃ and H₂O Data Table

Temperature of mixture (C⁰): 

Temperature of H₂O before mixing:          

Difference between two temperatures:                            

Increase or decrease in temperature ?:

Exothermic or endothermic ?:

Part 3:  Reaction between NaOH and H₂O Data Table

Temperature of mixture (C⁰): 

Temperature of H₂O before mixing:          

Difference between two temperatures:                            

Increase or decrease in temperature ?:

Exothermic or endothermic ?:

Questions:

1. What happens in an exothermic reaction?

2. What happens in an endothermic reaction?

3. Which of the reactions were exothermic?

4. How do you know it was exothermic?

5. Which of the reactions was endothermic?

6. How do you know it was endothermic?

7. Draw a picture showing the flow of energy in Part 2 of the laboratory.