CSEC Chemistry Paper 1 January 2013 - Free CXC Past Paper with Answers

In which group of the periodic table would Element Z be found?

The oxidation state of an ion of Element Z would MOST probably be

One property of ionic compounds is that they

are solids and vaporize easily

usually dissolve in organic solvents

conduct electricity when molten or dissolved in water

Isotopes of an element contain

different numbers of protons

the same number of neutrons

the same number of electrons as neutrons

the same number of protons as electrons

The equation for the reaction of barium hydroxide with dilute sulfuric acid is $\text{Ba(OH)}_2\text{(aq)} + \text{H}_2\text{SO}_4\text{(aq)} \rightarrow \text{BaSO}_4\text{(s)} + 2\text{H}_2\text{O(l)}$

From this equation, which of the following would be correct?

I. $1$ mole of sulfuric acid is neutralized by $1$ mole of barium hydroxide. II. $2$ moles of barium sulfate are produced from $2$ moles of sulfuric acid. III. $2$ moles of water are produced from $1$ mole of hydroxide ions.

The values of $x$ and $y$ in the equation $x\text{KOH} + 3\text{Br}_2 \rightarrow y\text{KBr} + \text{KBrO}_3 + 3\text{H}_2\text{O}$ are

The ionic equation for the reaction between an acid and a carbonate is represented by

$2\text{H}^+\text{(aq)} + \text{CO}_3^{2-}\text{(aq)} \rightarrow \text{HCO}_3^-\text{(aq)}$

$\text{H}^+\text{(aq)} + \text{CO}_3^{2-}\text{(aq)} \rightarrow \text{H}_2\text{O(l)}$

$2\text{H}^+\text{(aq)} + \text{CO}_3^{2-}\text{(aq)} \rightarrow \text{CO}_2\text{(g)} + \text{H}_2\text{O(l)}$

$\text{H}^+\text{(aq)} + \text{CO}_3^{2-}\text{(aq)} \rightarrow \text{CO}_2\text{(g)} + \text{H}_2\text{O(l)}$

Which of the following organic compounds has the GREATEST percentage by mass of carbon present in one mole? ( $M_r = \text{relative molecular mass; relative atomic mass: } H = 1; C = 12; O = 16$ )?

$C_2H_4O_2 (M_r = 60)$

'Ionic bond formation' results from the

donation of electrons from a metal to a non-metal to achieve stability

donation of electrons from a non-metal to a metal to achieve stability

attraction between the positively charged ions of a metal and a pool of electrons

sharing of electrons between the atoms of a metal and non-metal to achieve stability

Which of the following compounds is covalent?

Which of the following formulae is correct for ammonium carbonate?

Which of the following elements exists as molecules?

Which of the following mixtures are arranged in order of INCREASING particle size?

Colloids, solutions, suspensions

Solutions, suspensions, colloids

Solutions, colloids, suspensions

Suspensions, colloids, solutions

Sublimation can be used to separate

a pair of liquids that do not mix

suspended solids from a liquid

components of a liquid with similar boiling points

a solid with weak interparticle forces from one with strong interparticle forces

Which of the following elements has the LEAST oxidizing power?

Sulfuric acid is a stronger acid than ethanoic acid (acetic acid) in aqueous solution because sulfuric acid

is more concentrated than ethanoic acid

is more corrosive than ethanoic acid

ionises to a greater extent than ethanoic acid

causes sugar to char whereas ethanoic acid does not

Which of the following substances do NOT produce water when reacted with acid?

The smell of pastries when they are being baked is caused by the molecules of the baked pastries

spreading out to take the place of the air

spreading out evenly to fill the spaces in the air

moving from their low concentration around the pastries to the air

moving haphazardly into the air where the molecules of the pastries are in a higher concentration

Which of the following compounds is soluble in cold water?

A solution having a pH of 1 will

neutralize a solution of pH 4

react with zinc metal to produce hydrogen

react with zinc metal to produce a solution of pH 10

react with hydrochloric acid to produce a salt and water

Which of the following aqueous solutions contains ONE mole of hydrogen ions?

$1 \text{ dm}^3 \text{ of } 1.0 \text{ mol dm}^{-3} H_2SO_4$

$1 \text{ dm}^3 \text{ of } 1 \text{ mol dm}^{-3} CH_3COOH$

$2 \text{ dm}^3 \text{ of } 0.5 \text{ mol dm}^{-3} H_2SO_4$

$2 \text{ dm}^3 \text{ of } 0.5 \text{ mol dm}^{-3} HCl$

Which of the following pairs of substances would be MOST suitable for the preparation of copper sulfate crystals?

Copper and dilute sulfuric acid

Copper and concentrated sulfuric acid

Copper oxide and dilute sulfuric acid

Copper nitrate and dilute sulfuric acid

The number of moles of hydrochloric acid used in this reaction is

$\frac{100 \times 0.2}{1000}$

$\frac{1000 \times 0.2}{100}$

The effervescence is caused by the evolution of

A solution of sodium hydroxide is neutralized by the addition of dilute hydrochloric acid. The results obtained are used to plot the graph below.

Which of the points, A, B, C or D, on the graph represents the neutralization point of the reaction?

When a metal atom becomes an ion it

gains electrons and is oxidized

gains electrons and is reduced

loses electrons and is reduced

loses electrons and is oxidized

The compound $XO_2$ is acting as

an oxidizing agent in both experiments

a reducing agent in both experiments

an oxidizing agent in I and a reducing agent in II

a reducing agent in I and an oxidizing agent in II

When iron(III) sulfate reacts with aqueous potassium iodide, a brown colouration of iodine is produced. Which of the following deductions is correct?

Iron(III) sulfate is a reducing agent.

The iodide ion has been oxidized to iodine.

The iron(III) sulfate has lost electrons.

The iodide ion has gained electrons.

Which of the following products would be produced by the electrolysis of dilute sulfuric acid?

Which of the following metals would NOT undergo this reaction?

Which of the following substances does NOT conduct electricity?

At point X on the graph, the molecules of ammonia are

moving freely with little attraction

moderately attracted to each other

closely packed in an orderly fashion

randomly distributed in small clusters

A catalyst increases the rate of a reaction because it

binds irreversibly with the reactants

binds reversibly with the reactants

provides an alternative route of higher activation energy

provides an alternative route of lower activation energy

The following curves, A, B, C, and D, are plots of volume of gas produced against time for four different reactions. Which curve indicates the reaction with the fastest INITIAL rate?

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

In living things, energy is released from starches by chemical digestion followed by oxidation of

Which of the options below lists ALL the raw materials used in the extraction of iron?

Air, iron ore and limestone

Air, coke, iron ore and limestone

Air, coke, cryolite and limestone

Coke, iron ore, bauxite and limestone

A mixture of magnesium oxide and water when tested with litmus solution turns

Which of the following statements explains why, over time, aluminium products do NOT deteriorate in air as do iron products?

Aluminium is lower than iron in the activity series, therefore it reacts less readily with air than iron.

Both metals form oxide coats but aluminium oxide prevents further reaction while the iron oxide does not.

Aluminium is higher up in the activity series than iron, therefore it is more resistant to corrosion than iron.

Both metals form hydroxide coats but the aluminium hydroxide prevents further reaction while the iron hydroxide does not.

The conditions employed in the manufacture of ammonia by the Haber process are

low temperature, low pressure, no catalyst

high temperature, low pressure, catalyst

high temperature, high pressure, no catalyst

high temperature, high pressure, catalyst

Which of the following cations gives the results indicated in the table?

Which of the following metals is an important constituent of chlorophyll?

Which of the following compounds may be used to counteract the effects of acid rain on the soil?

When aqueous ammonia is added to aqueous iron(III) chloride one observes a

brown precipitate which is insoluble in excess

blue precipitate which is soluble in excess

green precipitate which is insoluble in excess

yellow precipitate which is soluble in excess

Which of the following gases will decolourise acidified aqueous potassium manganate(VII) when bubbled through the solution?

Which of the following is the correct structural formula for propanoic acid?

H-C(H)(H)-C(H)(H)-C(=O)-O-H

H-C(H)(H)-C(H)(H)-C(=O)-O-H (with a methyl branch)

H-C(H)(H)-C(H)(H)-C(H)(H)-C(=O)-O-H

H-C(H)(H)-C(H)(H)-C(=O)-O-H (with specific bond geometry)

Which of the following statements about alkenes is NOT true?

They fit the general formula C $_nH_{2n}$ .

They contain a double bond between two carbon atoms.

Their melting points and boiling points increase with an increase in molecular mass.

Those with four or more carbon atoms can exist as different isomers.

The structural formulae of two organic compounds are given below. Both compounds are

The functional group present in carboxylic acids is

$\text{H} - \text{C} = \text{O}$

$\text{OH} - \text{C} = \text{O}$

$\text{H} - \text{C} - \text{OH}$

$\text{H} - \text{C} = \text{C} - \text{OH}$

The oxidizing agent used for converting ethanol to ethanoic acid is

aqueous sodium hydroxide

concentrated sulfuric acid

acidified potassium dichromate

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

catalyze the reaction

dehydrate the ethanol

hydrolyze the products

During the digestion of polysaccharide by the human body, the main process occurring is

When ethene reacts with steam the ethene is

converted to ethanol

converted to an ester

decomposed to carbon

oxidized to carbon dioxide

Which of the following substances will be products of the reaction?

A polymer can be directly obtained from a reaction between compounds of formulae

Which of the following pairs contains ONE addition polymer?

Which of the following terms refers to the type of product formed in the reaction $n(\text{CH}_2 = \text{CH}_2) \rightarrow (\text{CH}_2 - \text{CH}_2)_n$ ?

The fermentation of sugars, using glucose as the substrate, can be represented by the equation

$\text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 2\text{C}_2\text{H}_5\text{OH} + 2\text{CO}_2$

$6\text{CO}_2 + 6\text{H}_2\text{O} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$

$\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O}$

$\text{C}_6\text{H}_{12}\text{O}_6 + \text{C}_6\text{H}_{12}\text{O}_6 \rightarrow \text{C}_{12}\text{H}_{22}\text{O}_{11} + \text{H}_2\text{O}$

The reaction can be classified as

addition polymerization

condensation polymerization

Which of the following compounds will react with ethanoic acid to form an ester?

$\text{CH}_3\text{CH}_3$

$\text{CH}_3\text{CHO}$

$\text{CH}_3\text{CH}_2\text{OH}$

$\text{CH}_3\text{CH}_2\text{Cl}$

$C_6H_{12}O_6 (M_r = 180)$

$C_2H_6O (M_r = 46)$

$C_3H_8O (M_r = 60)$

CSEC Chemistry Paper 1 January 2013 - Free CXC Past Paper with Answers

CSEC Chemistry Paper 1 January 2013 Questions