Waec Model Questions Vol1 2024 Physics Question 8

Practice essay / theory question 8 from the 2024 Waec Model Questions Vol1 Physics examination. This question covers Heat .

Waec Model Questions Vol1 2024 Physics Essay / Theory
Topic: Heat
Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • PHYSICS • essay

A 0.250 kg metal block is heated in a furnace until its temperature rises uniformly to 200 °C. It is then quickly transferred and immersed in a well‑insulated calorimeter containing 0.500 kg of water at 25 °C. The calorimeter itself has a heat capacity of 45 J·°C⁻¹. The final equilibrium temperature of the system is 30.0 °C. Assume that no heat is lost to the surroundings during the process.

Question Parts

( a )
Calculate the specific heat capacity of the metal block.
( b )
If the metal were instead a copper block (c = 385 J·kg⁻¹·K⁻¹), determine the expected equilibrium temperature under the same initial conditions and assuming no heat loss.
( c )
In practice some heat is lost to the surroundings. If the measured equilibrium temperature in part (a) was actually 29.0 °C, estimate the percentage of the total heat released by the metal that was lost to the surroundings.
( d )
Explain two experimental methods that could be employed to minimise heat loss in such calorimetry experiments.

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About This Question

This is Waec Model Questions Vol1 2024 Physics Question 8. It is one of the essay questions from the 2024 Waec Model Questions Vol1 Physics examination.

The question covers Heat .

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