practical 6

• Add 25 cm3 of water to a boiling tube, measured using a measuring cylinder.
• Measure the initial temperature of the water and record it.
• Weigh the food sample (to check the mass) and skewer it on the needle.
• Light a Bunsen burner away from the boiling tube and light the food sample in the flame.
• Place the burning food sample under the boiling tube.
• If the food sample goes out, relight it and place it back under the boiling tube until it will not relight.
• Record the final temperature of the water.
• Calculate the energy content of the food using the formula: energy (J) = mass of water (g) x temperature change (°C) x 4.2 (J °C-​1​ g-​1)​.