CSEC Chemistry Paper 1 May/June 2024 - Free CXC Past Paper with Answers

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

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

Which of the terms below describes the structure of copper?

Particles of a solid cannot move about freely because the

particles cannot be easily compressed

forces of attraction are very strong

forces of attraction are very weak

particles have a high density

Which of the substances, represented by the options A, B, C and D in the following table, is MOST likely sodium chloride?

The mass of 'one mole of atoms of an element' refers to the quantity of

one atom of the element

an element which contains 6.0 x 10^23 atoms

an element which occupies 24.0 dm^3 at STP

an element which combines completely with 12 g of carbon-12

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

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

Solutions, colloids, suspensions

Solutions, suspensions, colloids

Colloids, solutions, suspensions

Suspensions, colloids, solutions

When 100 cm³ of 2 mol dm³ hydrochloric acid (in excess) are added to 5.0 g of granulated zinc, hydrogen gas is evolved at a certain rate. If 5.0 g of powdered zinc were used instead, the rate of producing 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

Sodium hydrogen carbonate and hydrochloric acid reacted to produce sodium chloride. The mixture effervesced. The effervescence is caused by the evolution of

For more efficient processing, the pH of fresh sugar cane juice, which is usually 5.0–5.5, can be changed to 7.5–8.0 by adding

slaked lime, Ca(OH)₂

sodium chloride, NaCl

acetic (ethanoic) acid, CH₃CO₂H

An element, X, has 8 electrons in its outer shell. Which of the following are possible isotopes of X?

An example of a substance with a giant covalent structure is

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

Which of the following is the correct formula for ammonium carbonate?

(NH₄)₂(CO₃)₂

Which of the following features are true about the arrangement of electrons, protons and neutrons in an atom? I. Protons and neutrons are found in the nucleus. II. Electrons can be found anywhere inside the nucleus. III. The number of protons is the same as the number of electrons.

Which of the following electronic configurations represents an atom which will MOST readily form a positive ion?

Which of the atoms listed below would NOT form a positive ion?

Which of the following compounds is covalent?

Which of the following would be the LEAST suitable compound to add to sulfuric acid when preparing copper(II) sulfate?

Copper(II) carbonate

Copper(II) hydroxide

The atomic number of Element D is 13. In which group of the periodic table would Element D be found?

Some calcium carbonate was reacted with excess dilute hydrochloric acid. The volume of carbon dioxide evolved was recorded and plotted against time. Which of the following graphs represents the reaction?

Items 23 and 24 refer to the following equation. NO₂(g) + SO₂(g) → NO(g) + SO₃(g)

Which of the following compounds is reduced?

Which of the following compounds is the oxidizing agent?

A substance, Y, reacts with an ammonium salt to produce ammonia gas. Y must therefore be

Which of the following compounds is NOT a normal salt?

Sodium hydrogen carbonate

When an exothermic reaction occurs energy is

absorbed from the environment

released to the environment

absorbed from the reactants

released from the products

The particle $_{12}^{24}X^{2+}$ has 12 protons. How many neutrons and electrons does the particle have?

Neutrons 12 / Electrons 10

Neutrons 12 / Electrons 12

Neutrons 24 / Electrons 10

Neutrons 24 / Electrons 12

Diamond and graphite are allotropes of carbon because

they are the same physical forms of different elements

they are different physical forms of the same element

they both have the same molecular formula but different structural

they both have different molecular but the same structural formula

The strongest acid is

From the energy profile diagram above, it can be said that the reactants

give energy to products

give out heat when they react

absorb energy to form products

cannot be converted into products

Which of the following substances conducts an electric current and remains chemically unchanged?

Aqueous sodium chloride

Aqueous copper (II) sulfate

Which metal reacts readily with water to produce a strongly alkaline solution?

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

Which metal appears between copper and aluminium in the reactivity series and is an important component in haemoglobin?

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

Which of the following elements would NOT form an acidic oxide when burnt in air?

Item 38 refers to the following information. It was found that magnesium metal displaces zinc ions in zinc sulfate, while zinc metal displaces lead ions in lead sulfate.

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

Which of the following statements is true of carbon monoxide?

It is an acidic gas.

It is very soluble in water.

It turns lime water milky.

It reduces iron(II) oxide.

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.

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

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

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

Ammonia may be produced in the laboratory by heating a mixture of ammonium chloride and

Item 42 refers to the following table which shows the reaction of four metals, W, X, Y and Z, with water or steam. The table also shows the products formed when the nitrates of each metal are heated.

In which of the following pairs of metals is the first metal MOST likely to displace the second metal from solution?

Item 44 refers to the following information. A compound when treated with concentrated hydrochloric acid gives off a greenish- yellow gas which bleaches moist red litmus paper.

The gas given off is

On adding aqueous hydrochloric acid to a solution in a test tube, a gas is given off which extinguishes a burning splint. This shows the presence of

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

Methane (CH₄) reacts with chlorine gas in the presence of sunlight by a substitution reaction. Which of the following sub-stances would be products of the reaction? I. H₂ II. CH₃Cl III. HCl

Item 48 refers to two organic compounds, I and II, of molecular formula C,H,O, with the following structures. HHH HH H H-C-C-C-1 HOHH H-C-C-C-OH HHH Compound I Compound II

Compounds I and II are known as the