Neco Model Questions Vol1 2021 Chemistry Question 6

Practice essay / theory question 6 from the 2021 Neco Model Questions Vol1 Chemistry examination. This question covers States of Matter .

Neco Model Questions Vol1 2021 Chemistry Essay / Theory
Topic: States of Matter
Question 6 NECO_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay

A 2.00 g sample of an unknown substance is heated in a calorimeter. The substance has the following thermal data: • Specific heat capacity (solid) = 0.90 J g⁻¹ °C⁻¹\n• Specific heat capacity (liquid) = 1.20 J g⁻¹ °C⁻¹\n• Specific heat capacity (gas) = 0.60 J g⁻¹ °C⁻¹\n• Latent heat of fusion = 60 J g⁻¹\n• Latent heat of vaporisation = 220 J g⁻¹\n• Melting point = 0 °C\n• Boiling point = 100 °C\n The sample is initially at –20 °C and is heated until it reaches 120 °C.\n Answer the following:

Question Parts

( a )
Calculate the energy required for each of the following stages: i) Heating the solid from –20 °C to its melting point. ii) Melting the solid at 0 °C. iii) Heating the liquid from 0 °C to its boiling point. iv) Vaporising the liquid at 100 °C. v) Heating the gas from 100 °C to 120 °C.
( b )
Determine the total energy required to raise the temperature of the sample from –20 °C to 120 °C.
( c )
State which stage consumes the greatest amount of energy and give a brief explanation for this observation.

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This is Neco Model Questions Vol1 2021 Chemistry Question 6. It is one of the essay questions from the 2021 Neco Model Questions Vol1 Chemistry examination.

The question covers States of Matter .

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