Wednesday, May 26, 2010

Calorimeter Procedure - How to test each substance for calories:

Procedure - Calorimeter:
Set up a retort stand with a ring clamp and iron ring.
Find an empty pop can and poke two holes through it (straight across).
Fill the can will 100mL of water and take the water’s initial temperature
Insert a glass stirring rod into the two holes and use it to support the pop can over the Bunsen burner.
Stab a small sample of Kit Kat with a large paperclip and manipulate the paperclip so that it stands unassisted.
Cut out the middle portion of a pop can and cut out a 1 cm wide slit in one spot so that a lighter can be easily inserted.



Wrap the tin that is obtained around the paperclip with Kit Kat on it. This will reduce the heat loss as it will direct the heat at the bottom of the pop can.
Ignite the small piece of food with a lighter and wait for it to fully burn. Be sure that the bortom of the pop can is centred above the flame
Measure the final temperature of the water.
Find the amout of energy in the sample by using the formula Q=mc where m is mass of water, c is specific heat capacity of water (a constant) and is change in water’s temperature.

Repeat the process with a slice of banana of about the same mass.



**It may be helpful to place the banana piece in an oven for an hour to help dry it out, so that it may combust more easily.

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