CSEC Chemistry Paper 1 January 2019 - Free CXC Past Paper with Answers

Which of the following processes demonstrates that matter is made up of minute particles?

In the notation $^{35}_{17}\text{Cl}$ , the subscript represents the

mass of a mole of atoms

atoms in a mole of molecules

From the table below, which of the substances represented by the options, A, B, C and D, is MOST likely sodium chloride?

Boiling Point $2600$ °C, Electrical Conductivity Solid State: Yes, Aqueous State: No

Boiling Point $444$ °C, Electrical Conductivity Solid State: No, Aqueous State: No

Boiling Point $1465$ °C, Electrical Conductivity Solid State: No, Aqueous State: Yes

Boiling Point $-35$ °C, Electrical Conductivity Solid State: No, Aqueous State: Yes

The salt whose solubility changes to the GREATEST extent in the temperature range $0$ °C to $60$ °C is

hydrated copper(II) sulfate

Which of the following substances supplies protons as the only positive ions in aqueous solutions?

Crystals of sodium chloride are BEST described as

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

$2H^+(aq) + CO_3^{2-}(aq) \rightarrow HCO_3^-(aq)$

$H^+(aq) + CO_3^{2-}(aq) \rightarrow H_2CO_3(aq)$

$2H^+(aq) + CO_3^{2-}(aq) \rightarrow CO_2(g) + H_2O(l)$

$H^+(aq) + CO_3^{2-}(aq) \rightarrow CO_2(g) + H_2O(l)$

When $100\text{ cm}^3$ of $2\text{ mol dm}^{-3}$ hydrochloric acid (in excess) are added to $5.0\text{ g}$ of granulated zinc, hydrogen gas is evolved at a certain rate. If $5.0\text{ g}$ of powdered zinc were used instead, the rate of production of hydrogen gas would

increase because of the greater concentration of powdered zinc

increase because of the increased surface area of powdered zinc

decrease because of the decreased surface area of powdered zinc

decrease because of the lower solubility of powdered zinc

An element, X, has an electronic configuration $2, 8, 1$. At which of the following positions is the element in the periodic table?

Which of the properties above refer to a neutron?

Which of the properties above refer to a proton?

Two solutions are to be mixed in order to demonstrate an 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

Sulfur and oxygen are in the same group of the periodic table because

they can react with each other

they can form covalent compounds

they have the same number of electrons in their outer shell

the atomic number of sulfur is 16 and the relative atomic mass of oxygen is 16

How many moles of ethanoic acid are required to produce 0.5 mol of the ester?

Which of the following compounds is covalent?

Which of the acids above has a basicity of 2?

Which of the acids above is weakly ionized in aqueous solutions?

Which of the following reacts with an acid, liberating a gas which turns lime water milky?

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

Which of the following properties increases across Period 3 of the periodic table?

The colour of the precipitate produced was

What mass of oxygen atoms contains the same number of moles as $112\text{ g}$ of sulfur atoms?

[RAM: O = 16; S = 32]

The bond between the two carbon atoms is

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

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

Which of the following reactions occurs between propene and bromine?

$\text{FeCl}_2$ and $\text{FeCl}_3$ are two chlorides of iron. Which of the following statements about these two chlorides of iron 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

$2Pb(NO_3)_2(s) \rightarrow 2PbO(s) + 4NO_2(g) + O_2(g)$

$Pb(NO_3)_2(s) \rightarrow PbO(s) + NO_2(g) + O_2(g)$

$Pb(NO_3)_2(s) \rightarrow PbO(s) + 2NO_2(g) + O_2(g)$

$2Pb(NO_3)_2(s) \rightarrow PbO(s) + 2NO_2(g) + O_2(g)$

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

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 on the graph above represents the neutralization point of the reaction?

If substances containing one mole of solute per $\text{dm}^3$ are investigated, which substance should cause the bulb to glow BRIGHTEST?

Which of the diagrams illustrates bonding in chlorine?

Which of the diagrams illustrates bonding in oxygen?

Item 34 refers to the reaction represented by the equation below.

$\text{RCOOH(aq)} + \text{NaOH(aq)} \rightarrow \text{RCOONa(aq)} + \text{H}_2\text{O(l)}$

Which of the following processes correctly describes the reaction above?

The gas given off is

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

A current of $5$ amperes was passed for $193$ seconds through a solution of copper(II) sulfate using copper electrodes. [RAM: $\text{Cu} = 65$ ; Faraday's constant, $\text{F} = 96\ 500\ \text{C mol}^{-1}$ ]

The mass of copper that would be gained at the

anode is $0.005\ \text{g}$

cathode is $0.005\ \text{g}$

anode is $0.325\ \text{g}$

cathode is $0.325\ \text{g}$

The compound ethene is described as being unsaturated. This means that the

carbon atoms in ethene are linked by single bonds

carbon atoms in the molecule are very reactive

molecule contains at least one double bond

molecule has insufficient hydrogen atoms

Which of the following metals will react MOST vigorously with dilute acid?

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 metals is an important constituent of chlorophyll?

Which of the following options 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

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

Which of the following MOST likely identifies P and Q?

What is the correct structural formula for X?

Which of the compounds above has a fruity odour?

Which of the compounds above reacts with sodium carbonate to produce a gas which turns lime water milky?

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

Hexane is an alkane with six carbon atoms per molecule. Which of the following is the formula for hexane?

Compounds I and II are known as the

isomers of $\text{C}_3\text{H}_8\text{O}$

isotopes of $\text{C}_3\text{H}_8\text{O}$

condensed formulae of $\text{C}_3\text{H}_8\text{O}$

molecular formulae of $\text{C}_3\text{H}_8\text{O}$

Steel is often used in place of iron because it

is more susceptible to corrosion

has a lower melting point

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

I. They react with $\text{KMnO}_4/\text{H}^+$ . II. They undergo addition reactions. III. They undergo substitution reactions.

Which of the following tests can be used to distinguish between an alkane and an alkene?

I. Adding bromine solution II. Burning III. Conductivity

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

During the manufacture of ethanol by fermentation, the gas evolved

turns lime water cloudy

burns with a blue flame

relights a glowing splint

turns potassium dichromate green

Which of the following is a natural source of hydrocarbons?

ALL members of a homologous series have similar

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.

Which of the following substances is a product of a halogenation reaction with methane?

Which of the following compounds is NOT formed from condensation polymerization?

CSEC Chemistry Paper 1 January 2019 - Free CXC Past Paper with Answers

CSEC Chemistry Paper 1 January 2019 Questions