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5 marksStates of Matter

CSEC Chemistry · May/June 2016 · Paper 2 · Question 1(a)(ii)

Students conducted an experiment to determine the melting point of an unknown solid, A. They used the apparatus shown in Figure 1, heating water to 80 °C with a Bunsen burner, then turning it off and recording temperature readings every minute for 10 minutes. Figure 2 shows some of the thermometer readings.

Using the data from Table 1, plot the graph of temperature versus time on the grid provided in Figure 3 on page 7. Five points have already been plotted for you. Draw a smooth curve through the points to complete the cooling curve for A.

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Other parts of this question

  1. 1(a)(i)Complete Table 1 by inserting the thermometer readings from Figure 2 (page 5) at the appropriate times.[4 marks]
  2. 1(a)(iii)List the THREE states of matter.[1 mark]
  3. 1(a)(iv)Define the term 'melting point'.[2 marks]
  4. 1(a)(v)Based on information from the graph plotted in (a) (ii), state the melting point of A.[1 mark]
  5. 1(a)(vi)From the graph plotted in (a) (ii), identify the time range during which there should be a mixture of liquid and solid in the boiling tube.[1 mark]
  6. 1(a)(vii)State ONE precaution, other than wearing safety apparel, which should be taken during this experiment to avoid injury to the face or hands.[1 mark]
  7. 1(a)(viii)Complete Figure 4 by drawing the arrangement of the particles of A at 0 min and 10 min. Use • (one dot) to represent a particle.[2 marks]
  8. 1(b)Complete Table 2 by inserting the appropriate inferences.[8 marks]

More practice: the rest of this paper · more States of Matter questions · all CSEC Chemistry past papers