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3.1 Temperature and energy changes: Q = mcΔT
3. Thermal physics
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
What is the specifi c heat capacity
of 1 kg of a substance if it
undergoes a change in
temperature of 1 K by absorbing
4200 J?
What is the energy transferred
when a mass of 2.5 kg of copper
(c = 389 J kg
-1
K
-1
) is heated from
35
o
C to 85
o
C?
What is the energy transferred
when a mass of 0.8 kg of iron (c =
449 J kg
-1
K
-1
) is heated from 20
o
C to 93
o
C?
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
Convert any data to appropriate
values (for example g to kg, or cm
to m)
Write down the equation that links
the variables together
Rearrange the equation to make
the unknown the subject
Substitute your data into the
equation, including the units
Calculate the answer, leaving a
unit and an appropriate number of
sig fi gs (same as data). Check
that the answer makes sense and
underline.
3.1 Temperature and energy changes: Q = mcΔT
3. Thermal physics
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
What is the specifi c heat capacity
of a substance of mass 1.8 kg if it
absorbed 450 J of energy to
increase in temperature by 38
o
C
What is the mass of water (c =
4200
J kg
-1
K
-1
) when it absorbs
980 J of energy to increase its
temperature from 25
o
C to 60
0
C.
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
Convert any data to appropriate
values (for example g to kg, or cm
to m)
Write down the equation that links
the variables together
Rearrange the equation to make
the unknown the subject
Substitute your data into the
equation, including the units
Calculate the answer, leaving a
unit and an appropriate number of
sig fi gs (same as data). Check
that the answer makes sense and
underline.
3.1 Temperature and energy changes: Q = mcΔT
3. Thermal physics
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
Convert any data to appropriate
values (for example g to kg, or cm
to m)
Write down the equation that links
the variables together
Rearrange the equation to make
the unknown the subject
Substitute your data into the
equation, including the units
Calculate the answer, leaving a
unit and an appropriate number of
sig fi gs (same as data). Check
that the answer makes sense and
underline.
3.1 Temperature and energy changes: Q = mcΔT
3. Thermal physics
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
Convert any data to appropriate
values (for example g to kg, or cm
to m)
Write down the equation that links
the variables together
Rearrange the equation to make
the unknown the subject
Substitute your data into the
equation, including the units
Calculate the answer, leaving a
unit and an appropriate number of
sig fi gs (same as data). Check
that the answer makes sense and
underline.
