(a) Define specific heat capacity.
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...................................................................................................................................................
............................................................................................................................................. [2]
(b) Two solid blocks X and Y are made from different metals. The blocks have different initial
temperatures. Block Y is initially at room temperature.
The blocks are placed in direct thermal contact with each other at time t = 0. Fig. 2.1 shows
the variation with t of the temperatures of the two blocks.
100
Question
Physics
CAIE2024
(a) Define specific heat capacity.
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [2]
(b) Two solid blocks X and Y are made from different metals. The blocks have different initial
temperatures. Block Y is initially at room temperature.
The blocks are placed in direct thermal contact with each other at time t = 0. Fig. 2.1 shows
the variation with t of the temperatures of the two blocks.
100
800 mol dm–3 of sodium hydroxide solution.
This resulted in a temperature rise of 2.9 °C.
Calculate the standard enthalpy change of neutralisation, Δ Hd, of
neut
quinic acid in kJ mol–1.
[Assume the density of both solutions is 1.0 g cm–3.
specific heat capacity of solution formed = 4.18 J g–1 °C–1]
(3)
Question
Mathematics
Edexcel2019
0 cm3 of sodium hydroxide solution, of concentration 1.00 mol dm–3, was placed
in a polystyrene cup. The initial temperature was measured.
(i) Which piece of equipment has the smallest measurement uncertainty for the
measurement of 50.0 cm3 of sodium hydroxide solution?
(1)
Equipment Measurement uncertainty for each reading
A burette ±0.05 cm3
B 50 cm3 measuring cylinder ±1 cm3
C 25 cm3 pipette ±0.06 cm3
D 50 cm3 pipette ±0.08 cm3
(ii) 50.0 cm3 of propanoic acid solution, of concentration 1.00 mol dm–3, was
added and thoroughly mixed with the sodium hydroxide solution in the
polystyrene cup.
The maximum temperature rise was 6.5 °C.
Calculate the enthalpy change of neutralisation for propanoic acid, in kJ mol–1,
giving your answer to the nearest whole number.
[Assume density of the mixture = 1.00 g cm–3, specific heat capacity of the
mixture = 4.18 J g–1 °C–1]
(3)
Question
Mathematics
Edexcel2018
*P52302RA0528*
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(b) Calculate the enthalpy change of neutralisation for the reaction between nitric acid
and sodium hydroxide solution, using the results of the experiment.
Give your answer to an appropriate number of significant figures.
Assume: density of the reaction mixture = 1.0 g cm−3
specific heat capacity of the reaction mixture = 4.18 J g−1 °C−1
(4)
(Total for Question 3 = 5 marks)
Question
Mathematics
Edexcel2017
0 cm3 of 1.00 mol dm–3 aqueous ammonia.
Give your answer to an appropriate number of significant figures.
[Assume: the density of the solution is 1.00 g cm–3 ]
the specific heat capacity of the solution is 4.18 J g–1 (cid:113)C–1
(3)