CSEC Chemistry Paper 1 January 2017 - 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 consist of ions held together by electrostatic forces.

Which of the following statements about covalent bonds is correct?

They are formed by the transfer of electrons.

They are formed between metals and non-metals.

They are formed by the sharing of electrons between atoms.

They are generally stronger than ionic bonds.

The diagram below shows the structure of a molecule.

A single covalent bond

A double covalent bond

A triple covalent bond

A coordinate covalent bond

Which of the following is the correct order of increasing electronegativity?

Which of the following factors affects the rate of reaction?

Which of the following is a characteristic of a catalyst?

It increases the activation energy of a reaction.

It is consumed during the reaction.

It increases the rate of a reaction without being consumed.

It changes the equilibrium position of a reversible reaction.

Which of the following is an example of an exothermic reaction?

Evaporation of water

Combustion of methane

Dissolving ammonium nitrate in water

The diagram below shows a reversible reaction.

The forward reaction rate increases and the reverse reaction rate decreases.

The forward reaction rate decreases and the reverse reaction rate increases.

Both forward and reverse reaction rates increase.

Both forward and reverse reaction rates decrease.

An element, X, has an electron configuration 2, 8, 1. At which of the following positions is the element in the Periodic Table?

Items 10-11 refer to the following information. When a compound is treated with concentrated hydrochloric acid, a greenish-yellow gas which bleaches moist red litmus paper is given off.

The gas given off is

The concentrated hydrochloric acid is acting as

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

Taking mass readings

Taking temperature readings

Monitoring the pH of the solutions

Carefully observing colour changes

Crystals of sodium chloride are BEST described as

Ethanoic acid reacts with ethanol to form an ester and water. How many moles of ethanoic acid are required to produce 0.5 mol of the ester?

The diagram above represents the arrangement of atoms in

Which of the following statements regarding the effect of a catalyst on a reaction is INCORRECT?

It has no effect on the yield of products.

It is unchanged chemically on completion of the reaction.

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

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

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

From which of the following substances can a solid be obtained by the process of sedimentation?

Which of the following gases shows NO reaction with moist litmus paper?

Which of the following techniques or processes may be used to separate a mixture of plant pigments?

Fractional distillation

Paper chromatography

The colour of the precipitate produced was

Water was added to the residue to

dissolve the precipitate

prevent further reaction

purify the precipitate

The atoms of element Y contain 19 electrons. The chemistry of element Y will be similar to

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

During the reaction between ethanol and ethanoic acid, a small quantity of concentrated sulfuric acid is added to

catalyse the reaction

dehydrate the ethanol

hydrolyse the products

Which of the following reactions occurs between propene and bromine?

FeCl₂ and FeCl₃ are two chlorides of iron. Which of the following statements about these two chlorides of iron is/are TRUE?

I. The percentage of iron by mass in the two chlorides is different. II. The colours of the aqueous solutions of the two chlorides are different. III. The aqueous solutions of the two chlorides do not conduct electricity.

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

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

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

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

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

Which of the following compounds yields a brown gas and a black solid residue on heating?

Which of the following metals are extracted from their ores by reduction of their oxides with carbon?

Aluminium and magnesium

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

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

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

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

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

Items 32-33 refer to the following diagrams which represent bonding as it occurs in certain compounds.

In answering Items 32-33, each option may be used once, more than once or not at all.

Which of the diagrams illustrates bonding in chlorine?

Which of the diagrams illustrates bonding in oxygen?

The rate of a chemical reaction does NOT depend on the

presence of a catalyst

concentration of the reactants

temperature of the reacting system

energy change associated with the reaction

Items 35-36 refer to the following reactions.

(A) Hydrolysis (B) Dehydration (C) Saponification (D) Esterification

In answering Items 35-36, each reaction may be used once, more than once, or not at all.

In which reaction is ethane produced from ethanol?

Which reaction involves the boiling of a fat or oil with aqueous sodium hydroxide (caustic soda)?

Items 37-38 refer to the following acids.

(A) Sulfuric acid (B) Hydrochloric acid (C) Nitric acid (D) Ethanoic acid

In answering Items 37-38, a particular acid may be used once, more than once, or not at all.

Which acid functions as a dehydrating agent when concentrated?

Which acid reacts with copper to produce an acidic, reddish-brown gas?

Which of the following ionic equations involves oxidation?

$S^{2-} - 2e^{-} \rightarrow S$

$Cl_2 + 2e^{-} \rightarrow 2Cl^{-}$

$2H^{+} + 2e^{-} \rightarrow H_2$

$Na^{+} + e^{-} \rightarrow Na$

Which of the following methods is used for the extraction of aluminium?

Electrolysis of its molten oxide

Reduction of its oxide using coke

Electrolysis of its aqueous chloride

Reduction of its oxide using carbon monoxide

Which of the following correctly identifies the homologous series to which each compound belongs?

  Q       R       S

Which of the following metals neither reacts with water nor displaces hydrogen from dilute hydrochloric acid?

The existence of millions of organic compounds is due primarily to the ability of carbon to form I. multiple bonds II. ring structures III. branched chains

Which of the following aqueous solutions will produce a yellow precipitate with aqueous potassium iodide?

What is the order of reactivity, from most reactive to least reactive?

Items 46-47 refer to the following organic compounds. (A) Natural gas (B) Propene (C) Ethanol (D) Vinegar In answering Items 46-47, each compound may be used once, more than once or not at all.

Which of the compounds can be hydrated?

Which of the compounds has a pH less than 7?

Which of the following is produced when carbon monoxide reacts with iron(III) oxide?

A piece of limestone is treated with dilute hydrochloric acid. Which of the following would be observed? I. Effervescence occurs. II. A gas is evolved with a pungent odour. III. A gas is evolved which turns limewater milky.

Which of the following structures represents a compound that can react with an alcohol to produce a sweet smelling liquid?

Steel is often used in place of iron because it

is more susceptible to corrosion

has a lower melting point

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

zinc metal to produce hydrogen

hydrochloric acid to produce chlorine

zinc metal to produce a solution of pH 10

hydrochloric acid to produce a salt and water

Which of the following is the reason for adding cryolite to pure alumina in the extraction of aluminium by electrolysis?

It lowers the melting point.

It reduces the resistance.

It reduces the current.

What type of reaction occurs when zinc metal is added to copper sulfate solution?

A formula of a gas with a distinctive colour is

Which of the following is a natural source of hydrocarbons?

ALL members of a homologous series have similar

Glucose is converted to starch or cellulose by

condensation polymerization

addition polymerization

oxidation and reduction

Which of these compounds will react with bromine solution only if light is present?

During the manufacture of ethanol by fermentation, the gas evolved

burns with a blue flame

turns limewater cloudy

relights a glowing splint

turns potassium dichromate green

CSEC Chemistry Paper 1 January 2017 - Free CXC Past Paper with Answers

CSEC Chemistry Paper 1 January 2017 Questions