Practical: investigate the specific heat capacity of a substance
3 marks · NormalFigure 1 shows a diagram of apparatus used for a specific heat capacity experiment.
State two measurements that must be taken during this experiment, other than temperature.
Explain why the metal block is often surrounded by insulating material in this type of experiment.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) — · must show Any two of: mass of block, voltage (V), current (I), time (t)
(b) To reduce heat loss to the surroundings, so more supplied energy is used to heat the block. · must show Insulation reduces/limits heat/energy loss to surroundings
Must show: States any two of: mass of metal block, voltage across heater, current through heater, time heater is switched on, Explains insulation reduces heat loss to surroundings
Common mistakes: Measuring temperature at only one point; Saying insulation keep block warm (vague)
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · First correct measurement named (mass OR voltage OR current OR time)
B2 (a) · 1 mark · Second correct measurement named
B3 (b) · 1 mark · Clear reason linking insulation to reduced heat loss
Worked solution
a) Two measurements to take are the mass of the metal block and the time the heater is switched on. (Voltage and current are also valid).
b) The insulation is used to reduce heat loss to the surroundings, meaning more thermal energy goes into heating the metal block.