A student investigated the amount of energy released when different types of food were burnt using the apparatus in Figure 1.
Figure 1
The student used the following method and used the same mass of each food type:
- Pour cold water into a boiling tube
- Measure the starting temperature of the water
- Heat the food until it catches fire
- Heat the water using the flame from the burning food
- Measure the final temperature of the water
Draw lines to show which are the correct identities of the independent and control variables in this experiment.
You may draw more than one line from each variable.
The results of the investigation are shown in Table 1.
Table 1
Food type |
Crisp | Biscuit | Bread | Cake | |
Starting temperature of the water in oC | 21 | 21 | 22 | 21 |
Final temperature of the water in oC | 32 | 26 | 28 | |
Temperature change of the water in oC | 11 | 9 | 4 | 7 |
What was the final temperature of the water when the biscuit was burned?
Which type of food released the most energy?
Type of food: _________________________________
Give a reason for your answer.
_____________________________________________________________________
_____________________________________________________________________
These foods released energy when they were burned.
What word can be used to describe the reaction when food burns?
Tick (✓) one box.
Displacement | |
Exothermic | |
Neutralisation | |
Endothermic |
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