Section 4 - Red

Question 1

Describe four main things our bodies need a constant release of energy for.

Answer 1

Movement, growth, repair, maintain body temperature

Question 2

What is the equation to find out the j of energy in 1 g of food?

Answer 2

Energy in 1g of food (J) = (volume of water x temperature rise x 4.2) ÷ mass of food

Question 3

Arrange the food groups into the correct order based on energy content (largest first).

Answer 3

Lipids, proteins, carbohydrates

Question 4

Suggest why oxygen gas is passed into a calorimeter

Answer 4

Helps combustion of the food

Question 5

Suggest why a calorimeter’s waste gas pipe is coiled

Answer 5

To increase the surface area for heat to transfer into the water

Question 6

Suggest why stirring the water in a calorimeter will improve the data collected

Answer 6

It distrabutes heat, makes all the water the same temperature