CSEC Chemistry Paper 2 January 2024 - Free CXC Past Paper with Answers

State how the elements in the periodic table are arranged.

Using the elements W, X, Y and Z from Figure 3 above,

state the pair of elements found in the same period.

identify the elements in Group 2.

state which element in Group 2 is more reactive.

Sodium and chlorine are pure substances. However, they are found combined in sodium chloride which dissolves in water to form a mixture.

State the difference between a mixture and a pure substance.

State TWO other examples of a pure substance.

Name the type of mixture formed when sodium chloride is dissolved in water.

Identify a separation technique that can be used to remove the sodium chloride from the water.

Write a balanced chemical equation, including state symbols, for the reaction between Element X and dilute hydrochloric acid.

Another salt of chlorine, silver chloride, does not dissolve in water.

Name the type of mixture formed when a small quantity of silver chloride is added to a beaker of water.

Suggest a separation technique that can be used to remove the silver chloride from the beaker of water.

Define the term 'cracking'.

State ONE type of cracking that can be used to make hydrocarbons.

List THREE general characteristics of a homologous series.

Name the homologous series to which Compound A belongs.

Write the general formula for the homologous series to which Compound A belongs.

Write the molecular formula for Compound A.

In the space provided below, draw the FULLY displayed structure of TWO structural isomers of Compound A.

Isomer 1

Isomer 2

State the names of the TWO isomers drawn in (c) (i). Name of Isomer 1 Name of Isomer 2

The following materials were tested: copper coil, plastic, glass, aluminium can. Complete the table below by classifying the materials as conductors or non-conductors (insulators). An example has been completed.

Figure 6 shows an electrolytic cell which is used to test a dilute aqueous solution of sodium chloride.

Figure 6. Electrolytic cell

State ONE way in which the conduction of electricity in the solution of sodium chloride is different from that in the copper coils.

State which electrode in Figure 6 is the cathode and which electrode is the anode. Cathode Anode

Write balanced half-equations to show the substances produced at the cathode and the anode. Cathode Anode

Calculate the volume of hydrogen produced (measured at room temperature and pressure – rtp) during the electrolysis of dilute aqueous sodium chloride if a current of $1.5 \text{ A}$ flows for $20 \text{ minutes}$. [$1 \text{ F} = 96500 \text{ C mol}^{-1}$ and the molar volume of a gas at rtp ]

State the name of Compound B and Compound C. Compound B Compound C

State the functional group present in Compound B.

Which of the two compounds, B or C, is more soluble in water?

Compound B is made during wine production using yeast. Name the process used to make Compound B. Describe the purpose of yeast in the production of wine.

Write a balanced chemical equation, including state symbols, to show how Compound B can be made during the production of wine.

Compound D and water are formed from the reaction between Compound B and Compound C.

Draw the FULLY displayed structure of Compound D.

Compound D can be used in the production of polymers. Define the term "polymer".

State the type of polymerization that Compound D engages in.

State the full name for CFCs.

Give a named example of a CFC and state its formula.

Give the formula of a molecule with which CFCs react in the environment.

In many Caribbean countries, the use of CFCs as aerosol propellants is considered harmful to the environment. Hence, CFCs have been restricted in aerosol propellants or banned. Explain why CFCs are harmful to the environment.

State ONE use of chlorine gas.

State a laboratory test that can be used to identify chlorine gas.

A student reacts chlorine gas with aqueous potassium iodide to produce aqueous potassium chloride and a solid. Write a balanced equation, including state symbols, for the reaction.

From the balanced equation in (b) (iii), deduce whether chlorine is acting as a reducing or an oxidizing agent by showing the changes in the oxidation states of chlorine.