Quelpr
2 marksEnergetics

CAPE Chemistry Unit 1 · 2006 · Paper 2 · Question 8(a)(i)

The enthalpy of solution of sodium chloride is determined in a school laboratory. The results of four trials are presented in Table 4 below. The theoretical value is + 5.00 KJ mol-1.

Calculate the mean of ΔHsoln NaCl from the data.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 8(a)(ii)Comment on the precision and accuracy of the results.[3 marks]
  2. 8(a)(iii)Calculate the standard deviation of the data and explain the significance of the value.[3 marks]
  3. 8(b)(i)Discuss whether each instrument is appropriate for the measurement taken and suggest possible alternatives where necessary.[6 marks]
  4. 8(b)(ii)Give TWO reasons for calibrating an instrument such as a thermometer and suggest TWO steps involved.[4 marks]
  5. 8(c)Use the calibration curve in Figure 2 to determine the density of a block of metal that displaces a volume of 4.0 cm³.[2 marks]

More practice: the rest of this paper · more Energetics questions · all CAPE Chemistry Unit 1 past papers