CalorimetryMeasuring Heat

A Calorimeter

- A device used to measure the heat involved in a chemical reaction.

- The reaction is run in the inner container and the change in the temperature change of the water is measured. The specific heat of the water is KNOWN and the mass of the substance is measured BEFORE the reaction.

qreaction = -qwater

Bomb Calorimeter

Lab- How Much Energy is in a Potato Chip?

Purpose- How much energy is available for each gram of potato chip?

Safety- No Closed Shoes- No LAB! You will get an alternative

assignment.

Wear goggles over your eyes at ALL times!

Do NOT leave the thermometer in the can while burning the potato chip.

Extra Directions

Follow the procedure as given to you.

Take accurate measurements and everyone in the lab group should record the information in their data table.

No playing around- or earn a zero and a phone call home!

Data Table

Trial 1 Trial 2

Mass chipbefore g g

Mass chipafter g g

Volume water mL mL

Temperature-initial °C °C

Temperature- final °C °C

Analysis

1. Determine the change in mass of the chip

2. Calculate ΔT.

3. Calculate the mass of the water: d= m/V

density of water = 1.00g/mL

4. Determine the qwater

5. Determine the qchip

6. Calculate the qchip per gram by dividing the qchip by the change in mass of the chip.

7. According to the nutritional information on the chip bag, there should be 5.35 Cal/g or 22,414.29 J/g. Were your results close to the manufacturer’s results? Why or why not?

q = mCΔT