CSEC Chemistry Paper 1 May/June 2010 - Free CXC Past Paper with Answers

Which of the following is a characteristic of a non-metal?

It is a good conductor of heat and electricity.

It has a low melting point and boiling point.

It forms basic oxides.

It has a high ionization energy.

Which of the following elements has the highest first ionization energy?

Which of the following is a characteristic of a halogen?

It has 7 valence electrons.

It forms positive ions.

Which of the following is the correct order of reactivity for the halogens?

Which of the following is the most electronegative element?

Which of the following is the correct electronic configuration for a sodium ion, Na $^+$ ?

Which of the following is the correct electronic configuration for a chloride ion, Cl $^-$ ?

Which of the following is the correct electronic configuration for a magnesium ion, Mg $^{2+}$ ?

The mass concentration of a potassium chloride solution is 60gdm⁻³. What is the mass of potassium chloride in 25 cm³ of this solution?

The number of shared electron pairs in a methane molecule is

Items 11-13 refer to the information in the table below.

Match each item below with ONE of the options, A, B, C, D above. Each option may be used more than once, once or not at all.

Simple molecular structure

High / Insoluble / Yes / Not Applicable

High / Soluble / No / Yes

High / Insoluble / No / Not Applicable

Low / Insoluble / No / Not Applicable

High / Insoluble / Yes / Not Applicable

High / Soluble / No / Yes

High / Insoluble / No / Not Applicable

Low / Insoluble / No / Not Applicable

High / Insoluble / Yes / Not Applicable

High / Soluble / No / Yes

High / Insoluble / No / Not Applicable

Low / Insoluble / No / Not Applicable

Graphite can be used as a lubricant because of

strong attraction among the hexagonal layers of carbon atoms

weak attraction among the hexagonal layers of carbon atoms

the loose electrons which can move throughout the lattice

strong attraction within the hexagonal layers of carbon atoms

Which of the following substances is a suspension?

When a saturated solution of copper(II) sulphate is cooled, crystals of copper(II) sulphate-5-water begin to form because solubility of copper(II) sulphate-5-water

decreases with decreasing temperature

decreases with increasing temperature

increases with decreasing temperature

increases with increasing temperature

A separating funnel can be used to separate a mixture of

water and solid sodium chloride

kerosene and solid sodium chloride

In the portion of the periodic table indicated below, which of the elements, A, B, C and D, is MOST easily ionized?

Which of the following is NOT true of the group of elements known as the halogens?

They are all nonmetals.

They form negative ions by the loss of electrons from their atoms.

The boiling point of the elements increases as their atomic numbers increase.

The oxidizing power of the elements decreases as their atomic numbers increase.

A solution has a pH of 1. This solution would be expected to

neutralise a solution of pH 4

react with zinc metal to produce a solution of pH 10

react with zinc metal to produce hydrogen

react with hydrochloric acid to produce a salt and water

Ethanoic acid is a weak acid because it

is a carboxylic acid

does not irritate the skin

is not completely ionized in water

produces one hydrogen ion per molecule

A substance P, has the following properties. I. It is insoluble in water. II. A gas is evolved when P is added to dilute acids. III. P gives off a gas when heated. P is MOST likely

copper(II) carbonate

A specific base reacts with a salt to produce a gas which turns damp red litmus paper blue. Which of the following ions does the salt contain?

Which of the following salts can be prepared by mixing two solutions and then filtering? I. Barium sulphate II. Calcium nitrate III. Silver chloride IV. Ammonium carbonate

A solution, when treated with the gas sulphur dioxide, becomes green. Which of the following does the solution contain?

Potassium dichromate(VI)

Potassium manganate(VII)

In which of the following reactions is sulphur dioxide acting as an oxidising agent?

$2SO_2(g) + O_2(g) \rightarrow 2SO_3(g)$

$SO_2(g) + 2HNO_3(aq) \rightarrow H_2SO_4(aq) + 2NO_2(g)$

$SO_2(g) + H_2O(1) \rightarrow H_2SO_3(aq)$

$SO_2(g) + 2H_2S(g) \rightarrow 2H_2O(1) + 3S(s)$

Which of the following pairs of reactions would you expect to take place? I. $Zn(s) + Mg^{2+}(aq) \rightarrow Mg(s) + Zn^{2+}(aq)$ II. $Zn(s) + Cu^{2+}(aq) \rightarrow Cu(s) + Zn^{2+}(aq)$ III. $Mg(s) + Cu^{2+}(aq) \rightarrow Cu(s) + Mg^{2+}(aq)$ IV. $Cu(s) + Mg^{2+}(aq) \rightarrow Mg(s) + Cu^{2+}(aq)$

Which of the following statements are true? I. Metals conduct electricity by the movement of electrons. II. Electrolytes conduct electricity by the movement of positive and negative ions. III. Electrolytes conduct electricity by the movement of electrons.

During the electrolysis of aqueous copper(II) sulphate solution using inert electrodes, the ions migrating to the cathode are

Cu $^{2+}$ (aq) and (aq) SO $_{4}^{2-}$

H $^{+}$ (aq) and OH $^{-}$ (aq)

SO $_{4}^{2-}$ (aq) and OH $^{-}$ (aq)

Cu $^{2+}$ (aq) and H $^{+}$ (aq)

Item 30 refers to the following graph which shows the changes in temperature with time, for a substance heated until no further physical change takes place.

At which portion of the curve, I, II, III and IV, is the substance a liquid only?

Which of the following is NOT achieved by one Faraday of electricity?

Deposit of one mole of any element during electrolysis

Deposit of 12 g of magnesium during electrolysisC

Migration of Avogadro's number of electrons

Passage of electricity equivalent to 96 500

What quantity of electricity passes through the electrolyte when a current of 100 A flows for 10 minutes?

A piece of metal is reacted with an acid to produce hydrogen gas. Which of the following procedures should be employed in order to increase the rate of the reaction? I. Increasing the temperature at which the reaction is carried out II. Subdividing the lump of metal III. Reducing the concentration of the acid

Item 34 refers to the graph below which shows the rate of reaction for different particle sizes of the same mass of magnesium, reacting with dilute acid.

Which line on the graph, I, II, III or IV, would BEST represent the reaction with powdered magnesium?

Which of the following is true of an endothermic reaction?

Heat is given up to the surroundings.

Heat is absorbed from the surroundings.

The products have less energy than the reactants.

The products have the same energy as the reactants.

When crystals of potassium nitrate are dissolved in water, the temperature of the solution decreases because

energy is required to break down the crystal structure of the potassium nitrate

heat is always absorbed when a substance dissolves

the energy content of dissolved potassium nitrate is lower than that of solid potassium nitrate

the energy content of dissolved potassium nitrate is higher than that of solid potassium nitrate

The members of a homologous series have

different chemical properties

the same physical properties

the same functional group

different general formulae

Which of the following compounds is NOT a member of the alkene series?

Items 39-40 refer to the following options.

Match each item below with ONE of the options above, each of which may be used more than once, once or not at all.

Isomerism is a property shown by compounds possessing

the same structures but different molecular formulae

different structures and different empirical formulae

the same structures but different empirical formulae

different structures but the same molecular formulae

Which of the following equations correctly represents the reaction between butene and Br₂(l)?

Which of the following reactions correctly represents the dehydration of ethanol?

CH₃CH₂OH → CH₃COOH

CH₃CH₂OH → CH₃CHO

CH₃CH₂OH → C₂H₄

CH₃CH₂OH → 2CO₂ + 3H₂O

Which of the following structures represents an unsaturated hydrocarbon?

When ethanoic acid and ethanol react to form ethyl-ethanoate, the catalyst used is

dilute sulphuric acid

dilute hydrochloric acid

concentrated hydrochloric acid

concentrated sulphuric acid

When hydrocarbons with 5 to 12 carbon atoms are cracked, which of the following can be obtained?

I. Ethene II. Propene III. Methane IV. Petroleum

Which of the following statements are true for the fermentation of carbohydrates to produce ethanol?

I. The enzymes are obtained from yeast. II. The reaction mixture is kept at 50 °C. III. Carbon dioxide is a by-product of the reaction. IV. Ethanol is obtained from the mixture by titration.

Which of the following compounds produces amino acids, when hydrolysed?

Sodium chloride solution is used in the laboratory preparation of soap to

increase the solubility of the soap

make the soap more biodegradable

make the soap produce more lather in hard water

separate the glycerol formed from the soap

Which of the following statements about polymers are true?

I. Polymers are long-chain molecules made by joining together a large number of monomer units. II. Condensation polymers are generally made up from one type of monomer. III. Addition polymerization involves the breaking of a C = C double bond in the monomer.

Which of the following compounds are naturally occurring?

I. Terylene II. Nylon III. Fats IV. Proteins

Which of the following can decolourize potassium manganate(VII)?

Item 53 refers to the following structures.

Which structures represent branched alkanes?

Which of the following are properties of a metal? I. High melting point II. Good oxidizing agent III. Good conductor of electricity IV. Low density

Which of the following can be extracted by chemical reduction?

CSEC Chemistry Paper 1 May/June 2010 - Free CXC Past Paper with Answers

CSEC Chemistry Paper 1 May/June 2010 Questions