Worksheet 2
Worksheet 2
Worksheet 2
http://www.bbc.co.uk/education/guides/zdjfr82/revision/7
Calorimetry
To carry out this experiment, you need to:
1. pour cold water into a boiling tube
2. record the starting temperature of the water
3. record the mass of the food sample
4. heat the food until it catches fire
5. heat the water using the flame from the burning food
6. record the final temperature of the water
Calculations
Work out the energy transferred to the water with this equation:
energy transferred (J) = mass of water (g) 4.2 (J/gC)
temperature increase (C)
Question
When 0.5 g of food is burned, 10 cm3 of water warms up by 20C.
What is the energy content of the food in J/g?
A
Fair testing
When comparing different foods, it is important to carry out a fair test.
Several variables should be kept constant:
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