Calorimetry is the science of measuring the heat of chemical reactions. This is done by use of an instrument called a calorimeter. The image below is an example of a calorimeter.

Source: Bomb Calorimeter, University of Florida Chemistry

You may be more familiar with the type of calorimeter below which is made using two styrofoam cups.

Source: Styrofoam Calorimeter, University of Florida Chemistry

Watch the following two videos to learn how to calculate the heat in a chemical reaction.

Part I:

Part II:

Now answer the following questions.

If a calorimeter's ΔH is +2001 Joules, how much heat did the substance inside the cup lose? Interactive popup. Assistance may be required.

Check Your Answer
Since the heat gained by the calorimeter is equal to the heat lost by the system, then the substance inside must have lost the negative of +2001 J, which is -2001 J.

The specific heat of gold is 0.13 J/grams • °C. If 6.00 grams of gold was heated from 20.0°C to 25.0°C, how much heat was applied to the gold? Interactive popup. Assistance may be required.

Hint
The formula is
amount of energy = specific heat  x  mass  x  change in temperature

Check Your Answer
3.9J