Free CXC Chemistry Paper 3 May/June 2012 past paper from 2012. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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CSEC Chemistry Paper 3 May/June 2012 - Free CXC Past Paper with Answers
Free CXC Chemistry Paper 3 May/June 2012 past paper from 2012. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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An experiment was carried out to investigate the effect of temperature on the physical state of a substance, X. Some of the Solid X was heated until it melted. The temperature changes that occurred as the hot liquid cooled were recorded. Some of the results are shown in Table 1. The other temperature readings are displayed in Figure 1.
TABLE 1: TEMPERATURE VERSUS TIME DATA FOR SUBSTANCE X
| Time (min) | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 |
|---|---|---|---|---|---|---|---|---|---|
| Temperature (C) | 67.0 | 61.0 | 56.0 | 56.0 |
Figure 1. Thermometer readings at different times for Substance X
[20 marks]
Read EACH of the temperatures displayed in Figure 1, and record them in the appropriate spaces in Table 1.
[5 marks]
Use the data in Table 1 to plot a graph of temperature of Substance X against time on the axes provided in Figure 2. Four of the points have already been plotted on the graph.
[4 marks]
Draw a smooth curve through the points on the graph.
[1 mark]
From the graph, determine a value for the melting point of Substance X.
Melting point of Substance X:
[1 mark]
From the graph, determine the temperature of the hot liquid after 3 minutes of cooling.
Temperature:
[1 mark]
What is the physical state of Substance X at 6 minutes after cooling?
[2 marks]
Compare the arrangement of the particles in Substance X at 2 minutes and at 16 minutes after cooling.
[3 marks]
An experiment is carried out to determine the percentage composition by mass of sand and copper(II) sulphate in a mixture. A portion of the mixture is stirred in of distilled water, until no further change takes place. The resulting mixture is filtered into a clean beaker using a funnel fitted with filter paper.
[6 marks]
State clearly what is observed in the beaker and on the filter paper at the end of the experiment.
Beaker:
Filter paper:
[2 marks]
The residue from (b) (i) on page 4 was washed, dried and weighed on a watch glass of mass . The mass (in grams) was recorded on a balance. A part of the scale is shown.
Determine the mass of the residue and record it in the space provided.
Mass of residue:
[2 marks]
The filtrate in the beaker from (b) (i) on page 4 was evaporated to dryness and the remaining solid was transferred to a watch glass of mass and weighed on the same balance as in (b) (ii). A part of the scale is shown below.
Determine the mass of the solid and record it in the space provided.
Mass of solid:
[2 marks]
Calculate the percentage mass of sand in the mixture.
[1 mark]
Calculate the percentage mass of copper(II) sulphate in the mixture.
[1 mark]
Add the percentage masses of sand and copper(II) sulphate. Give ONE reason why the value is different from $100%$.
[1 mark]
A student carried out the following tests on a solid, R, which is a mixture of two compounds, and made the inferences recorded in Table 2. Complete Table 2 to show ALL possible observations.
| Tests | Observations | Inferences | | 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[10 marks]
Hypothesis:
[1 mark]
Procedure:
[3 marks]
Apparatus and materials:
[2 marks]
Data to be collected:
[2 marks]
Variable to control:
[1 mark]
Discussion of the results as they relate to the hypothesis. You may include a diagram to illustrate your discussion.
[3 marks]