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WORKSHEET LEVEL
Unit 11
THERMAL PROPERTIES OF MATTER
STRUCTURED QUESTIONS
2
Level 2 Worksheets
comprises of
(A) Heat Capacity
Application-based
Problems that are
(B) Specific Heat Capacity
commonly found in
Problems involving Temperature-Time Graphs
school’s
examination
papers.
1.
Liquid air contains mainly a mixture of oxygen and nitrogen. The
boiling point of nitrogen
is
11.1 Heat Capacity
–196 °C and the boiling point of oxygen is –183 °C. A sample of liquid air in a beaker is
allowed to warm up slowly. Fig. 6.1 shows how the reading of a thermometer in the beaker
varies with time t.
Common Questions
Types are identified and
labelled so that students
know what to expect in
an examination.
Fig. 6.1
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The liquid air contains 200 g of liquid oxygen and 800 g of liquid nitrogen. The specific heat capacity
of liquid oxygen is 1.7 J / (g °C) and the specific heat capacity of liquid nitrogen is 2.0 J / (g °C).
Calculate the thermal energy needed to warm the liquid from time t = 0 to 1 min.
Common Questions Types are
identified and labelled so that
students know what to expect in
an examination.
energy = ................................... [2]
Transfer of Heat from One Body to Another
2.
A 300 g block of lead, with a specific heat capacity of 130 Jkg–1K–1, is heated to a
temperature of 50°C. It is then dropped into a well-insulated beaker of water at 30°C. Take
the heat capacity of the water and beaker to be 300 JK–1, and assume that there is no heat
loss to the surroundings. Determine the final temperature of the block of lead and the water.
final temperature = ………………………… [2]
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Common Questions Types
are identified and labelled
This is an experiment to determine the specific heat capacity of water. The diagram below
that students
know
what
shows an insulated calorimeter.so
A calorimeter
is simply an
aluminium
container for the
water, with an aluminium stirrerto
andexpect
a cap for the
top.
The
quantity
of
heat
in an examination.needed to
produce a measured temperature change in a known mass of water is measured. Ammeter
Data-based Question
3.
and voltmeter is used to find the quantity of electrical energy put into the heater.
Temperatures, mass and time are measured with a thermocouple, an electronic balance
and a stopwatch respectively. All the above mentioned apparatus are not shown in the
diagram below.
The power of the heater can be calculated using the formula Power = Voltage x Current
The data of the experiment is shown in the table below:
Specific heat capacity of Aluminium
908 Jkg-1°C-1
Ammeter reading
3A
Voltmeter reading
24 V
Mass of water
500 g
Mass of Aluminium
170 g
Initial Temperature
298 K
Final Temperature
323 K
Time
13 mins
(a) State what is meant by the specific heat capacity of aluminium is 908 Jkg-1°C-1.
.............................................................................................................................................
.............................................................................................................................................
........................................................................................................................................ [1]
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(b) (i) Calculate the amount of heat generated by the heating coil.
heat generated = ......................................... [2]
(ii) Calculate the specific heat capacity of water.
specific heat capacity = ......................................... [3]
(a) (i) State one of the assumptions made to this experiment.
........................................................................................................................................
................................................................................................................................... [1]
(ii) In reality, the value (specific heat capacity of water) obtained will not be the same as
what is calculated. State how this value will be different and give a reason to
suggest why this might be so.
........................................................................................................................................
........................................................................................................................................
................................................................................................................................... [2]
Only Section 11.1 - Heat Capacity is shown in this sample
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