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2
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Diagram 2.1 is a graph of temperature, Ɵ
against time, t of an experiment to determine the specific heat capacity of
cooking oil, c .
Rajah 2.1 ialah graf suhu,
Ɵ melawan masa, t bagi satu eksperimen
untuk menentukan muatan haba tentu minyak masak , c.
(a) Based on the graph:
Berdasarkan graf:
(i)
Determine the initial
temperature of the cooking oil. Show on the graph how you determine this value.
Tentukan suhu awal minyak
masak. Tunjukkan pada graf bagaimana anda menentukan nilai ini.
............ 25°C.........................................................................................................
[ 2
marks]/[2 markah]
(i)
What is the relationship
between temperature of cooking oil, Ɵ and time of heating, t.
Nyatakan hubungan antara
suhu minyak masak, Ɵ dan masa pemanasan,
t.
increases linearly with t
…………………………………………………………..……....................
[1 mark ]/[ 1 markah]
(ii)
Calculate the gradient of the
graph, m. Show on the graph how you determine the gradient.
Hitung kecerunan graf, m.
Tunjukkan pada graf bagaimana anda menentukan kecerunan graf.
8.0°C min-1
[3 marks]/[ 3 markah]
(a) A 200 W immersion heater was used to supply heat energy to the
cooking oil.
The cooking oil
has a mass of 0.4 kg.
Pemanas rendam berkuasa 200
W digunakan untuk membekal tenaga haba kepada minyak masak. Minyak masak yang digunakan berjisim 0.4 kg.
(i) Calculate the amount of electrical energy, E
used by the immersion heater in 5 minutes.
Hitung jumlah tenaga elektrik, E yang digunakan oleh
pemanas rendam dalam masa 5 minit.
E=P x t = 200 x 5 x 60
60 000 J
[2
marks]/[2 markah]
(ii) The relationship between power of immersion
heater, P, mass of cooking oil, M, gradient,
m and specific heat capacity, c is given by the following equation:
Hubungan antara kuasa pemanas rendam, P, jisim
minyak masak,M, kecerunan graf, m dan muatan haba tentu,c diberi oleh persamaan
di bawah:
c = 60 P
mM
Using the
value of gradient of graph,m obtained in a(iii) and other given values,
calculate the specific heat capacity of the cooking oil.
Menggunakan
nilai kecerunan graf, m yang diperolehi dalam a(iii) dan nilai-nilai lain yang
diberi hitung muatan haba tentu minyak masak
Make the correct substitution
C = 60 P
= 60 x 200
mM 8 x
0.4
State the correct answer
3750
State the correct unit
J kg-1°C-1
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[3 marks]/[3 markah ]
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