1.14: calorimetry

What is calorimetry?

The amount of heat energy transferred during chemical reactions

What reaction is exothermic?

When heat is given out

What reaction is endothermic?

When heat energy is taken in

What equation is used to find the amount of heat energy transferred?

Energy transferred = mass of water x 4.2 x temperature increase

What are the units for this equation?

Energy transferred = joules, J

Mass = grams, g

4.2 = g/degrees Celsius

Temperature = degrees Celsius

How can you make a calorimeter?

Placing a beaker of water over a burning sample

What is a calorimeter?

A machine which determines how many calories are in food?

Why is a calorimeter used in the lab not very accurate?

Lots of the heat given off by the burning substance is transferred to the surroundings, not the beaker of water - this means that the calorimeter will underestimate the number of calories in a sample of food