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4 marksEnergetics

CAPE Chemistry Unit 1 · 2009 · Paper 2 · Question 1(b)

Figure 1 represents the apparatus assembled by a student for the experimental determination of the heat of combustion of ethanol.

Identify FOUR errors in the assembly of the apparatus in Figure 1.

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Other parts of this question

  1. 1(a)(i)State the property of elements which is responsible for the characteristic line spectrum of each element.[1 mark]
  2. 1(a)(ii)Sketch a diagram of the line emission spectrum of hydrogen. On your diagram, indicate the direction of increasing frequency and increasing wavelength.[3 marks]
  3. 1(a)(iii)Explain, in terms of electronic transitions, the origin of the lines in the Balmer series.[4 marks]
  4. 1(a)(iv)State the region of the electromagnetic spectrum in which the lines in the Balmer series occur.[1 mark]
  5. 1(a)(v)Calculate the energy (E) of a quantum of radiation with a corresponding frequency (v) of 4.57 x 10^14 Hz. (h = 4 x 10^-13 kJ s mol^-1)[2 marks]

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