CSEC Integrated Science Paper 3 May/June 2014 - Free CXC Past Paper with Answers

In a practical activity, a student uses the following apparatus and materials to find out which of four unknown metals labelled A, B, C and D is the best conductor of heat:

• Paraffin wax
• A beaker filled halfway with tap water
• A bunsen burner, tripod and wire gauze
• Four thumbtacks
• A thermometer

Write an appropriate aim for the practical activity being carried out by the student.

Outline a suitable procedure that could be used by the student to carry out this practical activity.

State THREE variables that must be kept constant in the practical activity outlined in (a) (ii) on page 5.

< ![CDATA[State the responding variable in the practical activity outlined in (a) (ii) on page 5.

< ![CDATA[Why is hot water used to provide the heat energy for this practical activity instead of heating directly with a Bunsen burner?

How will the student identify which rod is the BEST conductor of heat?

State TWO precautions that should be taken when carrying out this practical activity.

Figure 2 shows a beaker of water with a thermometer.

Figure 2. Diagram showing beaker of water with a thermometer

Read the temperature shown on the thermometer in Figure 2 and write your answer in the space below. State the units.

State TWO precautions to be taken when using the thermometer.

Read the spring balances presented in the right column of Table 2 and record the results in the spaces provided in Table 2.

TABLE 2: READING ON SPRING BALANCE FOR WEIGHTS

Using the grid paper provided on page 11, plot the points of Kamla’s results for the readings on the spring balance versus known weights at E.

Using the grid paper provided on page 11, plot the points of Kamla’s results for the readings on the spring balance versus known weights at E.

Draw the best-fit line to represent the information.

Label the axes on the graph. Include the units on EACH axis.

Extend your line upwards on the graph. Draw TWO dotted lines in the appropriate places on the graph to assist you with reading and recording the weight of X.

Weight of X 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