CSEC Chemistry Paper 1 May/June 2004 - Free CXC Past Paper with Answers

Which of the following is NOT a characteristic of ionic compounds?

They have high melting and boiling points.

They are soluble in polar solvents.

They conduct electricity in the solid state.

They form crystal lattices.

Which of the following is the correct order of increasing bond strength?

Which of the following is a Lewis acid?

The pH of a solution is 5. What is the concentration of hydrogen ions?

$1 \times 10^{-5}$ mol/dm $^3$

$1 \times 10^{5}$ mol/dm $^3$

$1 \times 10^{9}$ mol/dm $^3$

Which of the following oxides is amphoteric?

Which of the following reactions is an example of a redox reaction?

$HCl + NaOH \rightarrow NaCl + H_2O$

$CaCO_3 \rightarrow CaO + CO_2$

$Zn + CuSO_4 \rightarrow ZnSO_4 + Cu$

$AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$

Which of the following is the correct IUPAC name for $CH_3CH(CH_3)CH_2CH_3$ ?

Which of the following is a saturated hydrocarbon?

In the reaction between zinc and dilute sulphuric acid

an insoluble salt is formed

neutralisation occurs

oxidation and reduction occur

Which of the following exhibits allotrophy?

Item 11 refers to the following table.

Which of the substances A, B, C or D is MOST LIKELY sodium chloride?

Two particles have the following composition: (i) 10 protons, 12 neutrons, 10 electrons (ii) 10 protons, 11 neutrons, 10 electrons They are therefore both

A certain base reacted with a salt, producing a gas which turned damp red litmus paper blue. Which of the following ions does the salt contain?

Which of the following can act as oxidising agents? I. Metallic atoms II. Non-metallic atoms III. Metallic ions IV. Non-metallic ions

The number of shared electron pairs in the methane molecule is

A mixture of copper (II) oxide and copper (II) sulphate could BEST be separated by

shaking with excess water and then filtering

heating the mixture and condensing

shaking with excess water followed by fractional distillation

distilling the mixture

Two solutions are mixed in order to demonstrate endothermic change. Which of the following techniques is MOST appropriate?

Taking mass readings

Taking temperature readings

Carefully observing colour changes

Monitoring the pH of the solutions

An ion with a single negative charge may be converted into a neutral atom of the same element by

Which of the following possible effects of a catalyst on a reaction is NOT correct?

It has no effect on the yield of products.

It is unchanged chemically on completion of the reaction.

It lowers the energy of the reactants so that the reaction occurs at a faster rate.

It allows equilibrium to be attained more rapidly in a reversible reaction.

Which of the following halogens is a liquid at room temperature?

In which of the following does hydrogen have a negative oxidation number?

Which of the following elements does NOT exhibit allotropy?

The atoms of Element X contain nineteen electrons. With which of the following elements will the chemistry of X be similar?

Which of the following processes correctly describes the reaction above?

Which of the following statements is/are true of atoms?

I. They contain three fundamental particles. II. They are indivisible in chemical reactions. III. Those of an element are all exactly alike. IV. They contain particles which all carry charges.

When solid lead nitrate in heated, it decomposes giving off nitrogen (IV) oxide and oxygen. The balanced equation for this reaction is

$2\text{Pb(NO}_3)_2\text{(s)} \rightarrow 2\text{PbO(s)} + 4\text{NO}_2\text{(g)} + \text{O}_2\text{(g)}$

$\text{Pb(NO}_3)_2\text{(s)} \rightarrow \text{PbO(s)} + \text{NO}_2\text{(g)} + \text{O}_2\text{(g)}$

$\text{Pb(NO}_3)_2\text{(s)} \rightarrow \text{PbO(s)} + 2\text{NO}_2\text{(g)} + \text{O}_2\text{(g)}$

$2\text{Pb(NO}_3)_2\text{(s)} \rightarrow \text{PbO(s)} + 2\text{NO}_2\text{(g)} + \text{O}_2\text{(g)}$

A giant ionic structure

Sodium reacts with water according to the equation $2\text{Na(s)} + 2\text{H}_2\text{O(l)} \rightarrow 2\text{NaOH(aq)} + \text{H}_2\text{(g)}$ (Molar volume = 24 litres at room temperature and pressure).

The number of litres of hydrogen liberated when 0.1 mole of sodium reacts with excess water is

Which of the following diagrams BEST illustrates the course of an exothermic reaction?

An excess of magnesium powder was added to 50 cm³ of dilute sulphuric acid, and the reaction was allowed to continue until no more hydrogen evolved. Which of the following graphs BEST represents the complete reaction?

The arrangement of elements in the periodic table is based on

relative atomic mass

relative molecular mass

How many neutrons and electrons does the particle $\ce{^{24}_{12}X^{2+}}$ have?

Neutrons: 12, Electrons: 10

Neutrons: 12, Electrons: 12

Neutrons: 24, Electrons: 10

Neutrons: 24, Electrons: 12

Which of the atoms represented below by their electronic configuration will most readily form a positive ion?

Which two of the following statements about the compound are correct? I. It is an alcohol. II. It is a branched alkane. III. It can react with sodium. IV. It is an unreactive substance.

Ethanol can react with concentrated sulphuric acid to produce ethene. This reaction can be referred to as

Which of the following equations represents a condensation reaction?

$n\ce{C6H12O6} \rightarrow (\ce{C6H10O5})n + n\ce{H2O}$

$\ce{CH3CH=CH2 + HBr \rightarrow CH3CH2CH2Br}$

$\ce{CH3CH2CH3 + Br2 \rightarrow CH3CH2CH2Br + HBr}$

$\ce{CH3CH2COOH + NaOH \rightarrow CH3CH2COONa + H2O}$

Which of the following can be produced in one step from ethanol? I. Ethene II. Ethane III. Sodiumethanoate IV. Ethylethanoate

Compounds in a homologous series

exist in the same state

possess only carbon in straight chains

possess the same molecular formula

differ successively by a - CH₂ - group

Items 40-41 refer to the following chart.

I H₂O conc. H₂SO₄ ETHENE POLYTHENE Br₂ II

The product, polythene, is a

The number of isomers of butane C₄H₁₀ is

Glucose is converted to starch or cellulose by

addition polymerisation

oxidation and reduction

condensation polymerisation

POLYSACCHARIDE → DISACCHARIDE → MONOSACCHARIDE I II III Which of the following processes BEST describes the changes from I to III?

A compound was found to have a molecular formula C₄H₆. Which of the following is NOT an isomer of this compound?

With which of the following substances would n-octane, an alkane, react?

X and Y represent the monomers minus the functional groups, and - represents the linkage. The linkage could BEST be represented by

A polymer formed by an addition reaction has the structure -CHX-CH₂-CHX-CH₂-CHX-CH₂-CHX-CH₂- The formula of the monomer would be

Item 49 refers to the following diagrams.

In which of the experiments would the amount of chlorine gas collected be GREATEST?

Item 49 refers to the following diagrams.

Aluminium is more reactive than iron yet, after a while, a piece of aluminium left exposed to the atmosphere becomes corrosion resistant whilst a similar piece of iron continues to corrode. This is because the

aluminium has reacted completely

iron oxide formed is more reactive than the aluminium oxide formed

oxide film on aluminium protects the metal from further corrosion but the oxide film on iron does not

iron oxide reacts with the iron below but aluminium oxide does not react with the aluminium below

Which of the following elements reacts most vigorously with H+(aq) ions to give hydrogen gas?

Which of the following statements about sulphur are true? I. It is used in the manufacture of matches. II. It is used in the vulcanisation of rubber. III. It is used in the extraction of iron from its ore. IV. It is used in the manufacture of explosives.

Chloride ions can be identified by using

silver nitrate solution and dilute nitric acid

barium chloride solution and hydrochloric acid

sodium hydroxide solution and litmus

concentrated sulphuric acid and cop- per turnings

Which of the following methods can be used in the extraction of aluminium?

Reduction of the oxide by carbon or carbon monoxide

Oxidation of the sulphide to the oxide followed by reduction of the oxide by carbon

Partial oxidation of the sulphide to the oxide followed by self-reduction of the oxide by the sulphide

Electrolysis of a compound of the element in the molten state

Which of the following metals will NOT displace hydrogen from dilute hydrochloric acid?

Which of the following is an important constituent of chlorophyll?

The main substance responsible for 'acid rain' is

Which of the following processes gives a different gaseous product from the others?

Photosynthesis in plants

Respiration in animals

Oxidation of carbon monoxide

Heating calcium carbonate

Yeast may be used in the fermentation of starch to ethanol because

it contains enzymes which act on starch

yeast itself produces the ethanol

it fixes the oxygen needed in the reaction from the atmosphere

Which of the following is/are condensation polymers?

I. Terylene II. Nylon III. Starch IV. Polythene

CSEC Chemistry Paper 1 May/June 2004 - Free CXC Past Paper with Answers

CSEC Chemistry Paper 1 May/June 2004 Questions