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1 markSpecific Latent Heat, l

CSEC Physics · 1997 · Paper 2 · Question 4(a)(i)

The graph shows how the boiling point of water varies with the pressure of the air above the water. A school in Jamaica is situated at an altitude of 1000 m. At the school, air pressure is usually about 90 kPa.

At what temperature would you expect water to boil?

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Other parts of this question

  1. 4(a)(ii)What TWO factors lead to the pressure being lower at greater altitudes?[2 marks]
  2. 4(b)(i)If the weight used is 0.5 N, what is the pressure due to this weight? Convert your answer to kPa.[4 marks]
  3. 4(b)(ii)What is the total pressure acting on the contents if atmospheric pressure is 100 kPa?[1 mark]
  4. 4(b)(iii)At what temperature would the water in the pressure cooker boil?[1 mark]
  5. 4(b)(iv)What effect might the temperature identified in (iii) above have on the time it takes for the food to cook?[1 mark]
  6. 4(b)(v)To prevent accidents, the safety valve opens if the pressure inside the pressure cooker exceeds twice the pressure of the atmosphere. At what temperature does…[1 mark]
  7. 4(c)In terms of the kinetic theory of gases, why does the pressure of the gas in a sealed container rise when the temperature rises?[3 marks]

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