Food energy

GROUP MEMBERS

NAME MATRIC NO.

WONG SIEW CHING D20091034815

MARIA TING MEE SING D20081032208

PUI WAN TING D20091034840

SITI RAHAYU BT MOHAMED NOORD20091034855

UMI ABIBAH BT SULAIMAN D20091034811

SCIENTIFIC CONCEPT• Food energy is the amount of

energy obtained from food that is available through cellular respiration.

• As food burns, it releases energy.• Formula to calculate food energy:

ENGAGE

• Which nut has higher energy? • Why?

Cashew Nut

Peanut

Almond

ENPOWER• Material & Apparatus:

– clamp – stand – boiling tube– food: peanut, cashew nut, almond – a mounted needle– data logger and computer– temperature sensor– Bunsen burner– matches– electronic scales

ENPOWER

Data logger

ENPOWER• Procedures:

1. Connect the temperature sensor to the first socket on the data logger.

2. Weigh the food sample and record it. Add 30 cm3 water to the boiling tube.

3. Start the sensing software and see that it recognizes the sensors we attach. 

4. Set up the software to record. Heat the food in a Bunsen flame to light it.

5. Heat the tube of water with the burning food until it has completely burnt.

6. Re-light the food if necessary.

RESULTS

Food sample Mass of food sample(g) Rise in temperature(oC)

Peanut 0.5851 18.174

Cashew nut 1.4791 59.433

Almond 1.1521 38.920

RESULTS

the rise of water temperature by the heat from burning peanut

Time(s)0 20 40 60 80 100 120 140 160 180

0

5

10

15

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25

30

35

40

45

RESULTS

the rise of water temperature by the heat from burning cashew

nut

Time(s)0 20 40 60 80 100 120 140 160 180

0

10

20

30

40

50

60

70

80

90

RESULTS

the rise of water temperature by the heat from burning almond

Time(s)0 20 40 60 80 100 120 140 160 180

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

RESULTS

• Energy released from peanut per gram(J)

30 18.174 4.2

0.5851

3913.73

RESULTS• Energy released from cashew nut per gram(J)

• Energy released from almond per gram(J)

30 59.433 4.2

1.4791

5062.92

30 38.920 4.2

1.1521

4256.51

Discussions

•How does the graph tell you how much energy is in the food?

•Which food sample has highest energy?

•Did the water lose heat as a result? How could this affect your results?

ENHANCE

•eat to live OR live to eat???•WHY???

OR

Unique Features of This Activity

• save time and less works done• data more accurate• the apparatus is quite simple and

gives only a very approximate estimate for each foodstuff, so there is scope for students to suggest improvements in an evaluation

• allow students to understand better