Pasco TD-8557A Basic Calorimetry Set Manuel d'utilisateur télécharger pdf (Page 14)

Basic Calorimetry Set

final

= ________________

final

= ________________

Calculations

According to the principle of the conservation of energy, the quantity of heat absorbed by

the ice as it melts and then heats up to the final equilibrium temperature must equal the

quantity of heat released by the warm water as it cools down to the final equilibrium tem-

perature. Mathematically:

ice

)(H

) + (M

ice

)(1 cal/g K)(T

final

- 0° C) = (M

water

)(1 cal/g K)(T

initial

- T

final

)

ice

= M

final

- M

cal + water

= __________________

Use your data and the above information to determine H

, the latent heat of fusion per

gram of water.

= the latent heat of fusion per gram of water

Questions

1. What advantage might the commercially packaged coolant material have over ice

other than that it produces less mess? (If you didn’t perform the optional part of the

experiment, what properties would a material need in order to be a better coolant than

ice?)

2. Design an experiment to determine which of two substances (for instance, ice and

packaged coolant) will keep an insulated food cooler

a. cool for the longest time, and

b. at a lower temperature.

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Pasco TD-8557A Basic Calorimetry Set Manuel d'utilisateur Page 14