Energy measurements in food

Multiple Choice

Which measurement is not required to calculate the energy in a food sample?

• Mass of food

• Temperature change

• Volume of water

• pH

Match

Look at this calorimeter and match the following differences that help improve the validity of the results.

• Pure oxygen used.

• Stirrer used

• Copper coiled pipe

• Food burned in an insulated container

All food is burnt – complete combustion – results more accurate

To evenly distribute the heat – make sure all the water is the same temperature

More Surface area - more heat transferred to the water

Not as much heat energy is lost –temperature reading more accurate

• All food is burnt – complete combustion – results more accurate

• To evenly distribute the heat – make sure all the water is the same temperature

• More Surface area - more heat transferred to the water

• Not as much heat energy is lost –temperature reading more accurate

Multiple Select

What two factors should you control?

• Volume/mass of water

• Angle of tube

• temperature

• Distance of heat from tube

Multiple Choice

What is missing from this equation?

• mass of food

• temperature difference in °C

• temperature difference

• volume of water

Multiple Choice

What is missing from this equation?

• mass of food

• temperature difference in °C

• temperature difference

• volume of water

Multiple Choice

What is missing from this equation?

• mass of food

• Energy release in J

• temperature difference

• Energy release