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Peanut Calorimetry Lab

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by

Liz Franklin

on 19 July 2013

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Transcript of Peanut Calorimetry Lab

Peanut Calorimetry Lab
Procedure
1. Weight the shelled peanut and record in grams.
2. Place Peanut on the "Peanut Stand".
3. Measure 20 ml of water in graduated cylinder and pour in test tube.
4. Record the temp of the water in test tube and leave thermometer in the test tube
5. Hold test tube with test tube holders over the peanut and light peanut.
6. While the peanut is burning, note the rise in temperature and record the final highest temp of water when peanut is finished burning.
Set-up
calories
=

(Temperature increase)
(20 ml of water)

Mass of Peanut



Mass of Peanut =

Initial Temp =

Final Temp =
calorie
We can calculate the amount of calories a food item has by using the following equation:
Results
calories = ( 71 - 20 ) (20 ml)
Materials:

Beaker
Graduated Cylinder
Test Tube
Test Tube Holder
Goggles
Celsius Thermometer
Shelled Peanuts
Clay
Paperclip
Water
Matches or Lighter
Electronic Mass Scale

a
calorie
is the amount of heat
(energy)
required to raise the temperature of one gram of water by 1 degree Celsius
calorie
=
(Temperature Increase)

(Volume of Water)
-----------------------------------------------------------

Mass of Food Item
The night before a marathon runners are advised to eat a huge plate of pasta. Why?

What does pasta have in it?


What is energy?




What are the different forms of energy?
Energy : the ability to do work
or cause change

Work: a transfer of energy

Different types of energy:
solar energy
heat energy
chemical energy
electromagnetic energy

First law of Thermodynamics

Energy can be changed from one form to another, but it cannot be created or destroyed.
The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.

In this activity I will demonstrate how calories are measured by building a
Calorimeter.

a Calorimeter is a devise that measures the transfer of heat energy during a chemical or physical change.




a
calorie
is the amount of heat
(energy)
required to raise the temperature of one gram of water by 1 degree Celsius
What are calories and
how are they calculated
0.88g
Full transcript