Neco 2024 Chemistry Question 6

Practice essay / theory question 6 from the 2024 Neco Chemistry examination. This question covers Specific heat capacity, Latent heat of fusion, Phase change, Energy calculation, Molecular arrangement .

Neco 2024 Chemistry Essay / Theory

Topics: Specific heat capacity Latent heat of fusion Phase change Energy calculation Molecular arrangement

Question 6 NECO • 2024 • CHEMISTRY • essay

A 50.0 g sample of a pure substance is heated in a calorimeter. The substance has a specific heat capacity of 0.50 J·g⁻¹·K⁻¹ in the solid state and 0.80 J·g⁻¹·K⁻¹ in the liquid state. Its molar mass is irrelevant for this problem. The latent heat of fusion is 60 J·g⁻¹ and the melting point is 30\(^\circ\)C. The sample is initially at 20\(^\circ\)C and is heated until it reaches 120\(^\circ\)C.

Question Parts

( a )

Calculate the total amount of heat (in joules) absorbed by the sample to reach 120\(^\circ\)C.

( b )

Explain why the temperature of the substance remains constant at 30\(^\circ\)C during part of the heating process.

( c )

Briefly describe how the molecular arrangement of the substance changes from the initial state to the final state.

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About This Question

This is Neco 2024 Chemistry Question 6. It is one of the essay questions from the 2024 Neco Chemistry examination.

The question covers Specific heat capacity, Latent heat of fusion, Phase change, Energy calculation, Molecular arrangement .

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