Internal energy and energy transfers

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Question 7
Easy
a.

Liquid nitrogen is vaporised to form nitrogen gas. Complete the sentences below using one of the following options:

  • greater than
  • less than
  • the same as
  • The distance between the particles in nitrogen gas is the distance between the particles in liquid nitrogen.
  • The density of nitrogen gas is the density of liquid nitrogen.
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b.

The graph below shows how the temperature of the nitrogen varied with time as it was heated.

A line graph showing Temperature on the vertical axis and Time on the horizontal axis. A line starts at a low temperature, rises linearly and steeply up to a point labeled C, and then becomes a flat horizontal line ending at a point labeled D.

  1. What is the name of the process that is taking place between points C and D?
  2. Give a reason for your answer.
[2]
c.

A mass of 0.45 kg0.45\text{ kg}0.45 kg of liquid nitrogen was turned into nitrogen gas. The specific latent heat of vaporisation of nitrogen is 200 000 J/kg200\,000\text{ J/kg}200000 J/kg.

Calculate the thermal energy transferred to the nitrogen to turn it into gas.

Use the equation: thermal energy for a change of state=mass×specific latent heat\text{thermal energy for a change of state} = \text{mass} \times \text{specific latent heat}thermal energy for a change of state=mass×specific latent heat

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d.

The mass of the nitrogen gas was 0.45 kg0.45\text{ kg}0.45 kg and its volume was 0.36 m30.36\text{ m}^30.36 m3.

Calculate the density of the nitrogen gas.

Use the equation: density=massvolume\text{density} = \frac{\text{mass}}{\text{volume}}density=volumemass​

Choose the unit from the following options: kg\text{kg}kg, m3/kg\text{m}^3\text{/kg}m3/kg, or kg/m3\text{kg/m}^3kg/m3.

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Internal energy and energy transfers Questions

  1. GCSE
  2. /Physics
  3. /Internal energy and energy transfers