Quelpr

Specific Latent Heat, l · CSEC Physics

39 past-paper questions on Specific Latent Heat, l, part of Thermal Physics and Kinetic Theory, from every CSEC Physics paper on Quelpr.

Practise Specific Latent Heat, l
  1. 2(b)4 marks· CSEC Physics · 1988 · Paper 2Explain how an air-conditioner is able to transfer thermal energy from the room to the outside, referring to the evaporation and condensation cycle shown in the diagram.
  2. 2(d)6 marks· CSEC Physics · 1988 · Paper 2Architects quote the power of air-conditioning systems in 'ton' of air-conditioning, where 1 'ton' extracts the same amount of heat in 1 day as 1 ton of ice would need to melt at its normal melting point. Using the data…
  3. 1(c)(i)3 marks· CSEC Physics · 1992 · Paper 20.30 kg of ice at 0 °C is placed in a container. Calculate how much energy is required to completely melt the ice. (Specific latent heat of fusion of ice = 3.3 x 10^5 J kg^-1)
  4. 2(iv)3 marks· CSEC Physics · 1993 · Paper 2An alternative way of disposing of the waste heat is to use it to evaporate water in the power station. How much water would have to be evaporated EACH second if the latent heat of vaporisation of water is 2.3 x 10^6 J…
  5. 4(a)(i)1 mark· CSEC Physics · 1997 · Paper 2At what temperature would you expect water to boil?
  6. 4(b)(iii)1 mark· CSEC Physics · 1997 · Paper 2At what temperature would the water in the pressure cooker boil?
  7. 4(b)(iv)1 mark· CSEC Physics · 1997 · Paper 2What effect might the temperature identified in (iii) above have on the time it takes for the food to cook?
  8. 4(b)(v)1 mark· CSEC Physics · 1997 · Paper 2To prevent accidents, the safety valve opens if the pressure inside the pressure cooker exceeds twice the pressure of the atmosphere. At what temperature does this occur?
  9. 1(b)2 marks· Physics Q1 1(b)Using a dotted line on the graph, determine the melting point of the substance that was heated.
  10. 1(c)(i)1 mark· Physics Q1 1(c)(i)In what state is the substance as it moves between points B and C?
  11. 1(c)(ii)1 mark· Physics Q1 1(c)(ii)Explain why the temperature was constant between B and C.
  12. 1(f)3 marks· Physics Q1 1(f)Water boils at 100°C. Calculate the heat energy which must be supplied in order to completely convert the 2 kg of water to steam. [Specific latent heat of vaporization of water = 2.3 x 10⁶ Jkg⁻¹]
  13. 1(g)4 marks· Physics Q1 1(g)Distinguish between boiling and evaporation.
  14. 2(b)2 marks· Physics Q2 2(b)A substance which has a melting point of 80 °C is cooled from 90 °C to a complete solid at its melting point. Sketch a graph in Figure 1 to represent the statement above.
  15. 2(b)(i)6 marks· Physics Q2 2(b)(i)Calculate the energy needed for the ice to totally melt and to reach its present temperature. Assume no heat losses. [Specific Heat Capacity of water = 4 200 J Kg⁻¹K⁻¹, Specific Latent Heat of Fusion of Ice = 340 000 J…
  16. 2(b)(ii)3 marks· Physics Q2 2(b)(ii)Calculate the energy required to convert the water to steam at 100 °C.
  17. 2(b)(iii)2 marks· Physics Q2 2(b)(iii)What is the total energy, in mega joules, required to heat the 8 kg of water at 33 °C to steam at 100 °C? [Specific heat capacity of water = 4 200 J kg⁻¹K⁻¹] [Specific latent heat of vaporization of water = 2 300 000 J…
  18. 2(c)5 marks· Physics Q2 2(c)The power of the electric heater used in the experiment was 100 W. Assuming no heat was lost to the surroundings, calculate the specific latent heat of vaporization of water, l_v.
  19. 2(c)(ii)3 marks· Physics Q2 2(c)(ii)to heat the water from 100 °C to steam at 100 °C.
  20. 2(c)(iii)1 mark· Physics Q2 2(c)(iii)to completely convert the water from 37 °C to steam at 100 °C. (Specific heat capacity of water = 4200 J kg⁻¹ K⁻¹ Specific latent heat of vaporization of water = 2.3 × 10⁶ J kg⁻¹)
  21. 3(a)(ii)3 marks· Physics Q3 3(a)(ii)Define the term 'specific latent heat of vaporization'.
  22. 3(b)1 mark· Physics Q3 3(b)What does the symbol 'l' in the equation E_H = ml represent?
  23. 3(b)2 marks· Physics Q3 3(b)Sketch a graph on Figure 4 to represent the statement above.
  24. 3(c)(ii)2 marks· Physics Q3 3(c)(ii)Calculate the heat gained by the melted ice.
  25. 3(c)(ii)3 marks· Physics Q3 3(c)(ii)Calculate the amount of energy needed to convert the water at 100 °C to steam at 100 °C.
  26. 3(c)(iii)3 marks· Physics Q3 3(c)(iii)Assuming the heat lost by the water is equal to the heat gained by the ice, calculate the specific latent heat of fusion of ice.
  27. 3(c)(iii)1 mark· Physics Q3 3(c)(iii)Calculate the amount of energy needed to heat the water from 30 °C to steam at 100 °C.
  28. 3(d)3 marks· Physics Q3 3(d)How much more energy must the water absorb for 0.2 kg of it to boil off?
  29. 4(a)6 marks· Physics Q4 4(a)Describe how the apparatus shown in Figure 3 below may be used to show how the temperature of a substance such as naphthalene, varies during cooling. Include in your description any other equipment that may be necessary.
  30. 4(b)(i)1 mark· Physics Q4 4(b)(i)Determine the mass of the melted ice.
  31. 4(b)(iii)2 marks· Physics Q4 4(b)(iii)Write down an expression for the TOTAL heat gained by the ice in melting and the melted ice in warming to 20°C.
  32. 4(b)(iv)3 marks· Physics Q4 4(b)(iv)Hence calculate the specific latent heat of fusion of ice. [Specific Heat Capacity of water = 4.2 Jg⁻¹ K⁻¹]
  33. 5(b)(i)6 marks· Physics Q5 5(b)(i)Using the data above, calculate the specific latent heat of vaporization of water, assuming negligible heat is lost to the surroundings.
  34. 5(b)(i)6 marks· Physics Q5 5(b)(i)A block of ice of mass 2000 g was heated from 0 °C to steam at 100 °C. Calculate the energy used in Joules.
  35. 5(b)(ii)3 marks· Physics Q5 5(b)(ii)The coil of the immersion heater was NOT completely submerged. Explain how this would have affected the value for the specific latent heat of vaporization obtained in (b) (i) on page 17.
  36. 6(a)6 marks· Physics Q6 6(a)Describe how the specific latent heat of fusion of ice can be determined using the method of mixtures.
  37. 6(a)6 marks· Physics Q6 6(a)Describe the procedure she should use.
  38. 6(b)9 marks· Physics Q6 6(b)How much heat is needed to change this 25 g of ice at 0° C to steam at 100° C?
  39. 6(c)3 marks· Physics Q6 6(c)What mass of perspiration would remove the same quantity of heat as the urine in Part (b), when completely evaporated from the skin? Assume that evaporation is equivalent to a change of phase from liquid to vapour…

Related topics in Thermal Physics and Kinetic Theory