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aqa-a-level-physics-paper-2-2019-question-paper.

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Figure 1 shows a perfectly insulated cylinder containing 0.050 kg of liquid nitrogen at a temperature of 70 K. A heater transfers energy at a constant rate of 12 W to the nitrogen. A piston maintain ... s the pressure at 1.0 × 105 Pa during the heating process. Figure 1 . The nitrogen is heated from 70 K and is completely turned into a gas after 890 s. Calculate the specific heat capacity of liquid nitrogen. Give an appropriate unit for your answer. specific latent heat of vaporisation of nitrogen = 2.0 × 105 J kg−1 Do not write outside the box boiling point of nitrogen = 77 K [5 marks] specific heat capacity = unit = Question 1 continues on the next page . The work done by the nitrogen in the cylinder when expanding due to a change of state is X. The energy required to change the state of the nitrogen from a liquid to a gas is Y. Do not write outside the box Deduce which is greater, X or Y. density of liquid nitrogen at its boiling temperature = 810 kg m−3 density of nitrogen gas at its boiling temperature = 3.8 kg m−3 [4 marks] . State what is meant by the internal energy of a gas. [2 marks] Do not write outside the box . Absolute zero of temperature can be interpreted in terms of the ideal gas laws or the kinetic energy of particles in an ideal gas. Describe these two interpretations of absolute zero of temperature. [2 marks] [Show More]

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