GROUP MEMBERS

NAME MATRIC NO.

WONG SIEW CHING D20091034815

MARIA TING MEE SING D20081032208

PUI WAN TING D20091034840

SITI RAHAYU BT MOHAMED NOOR D20091034855

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

• ? Whi c h nut has hi ghe r e ne r gy

• ?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:

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

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

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

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

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

– Re-light the food if necessary.

RESULTS

38.9201.1521Almond

59.4331.4791Cashew nut

18.1740.5851Peanut

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

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

20

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

• e a t t o l i v e O R l i v e t o e a t ? ? ?

• WH Y ? ? ?

O R

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