3.
Which of the following sets of properties refers to a proton?
- (A)
+1 / 1
- (B)
0 / 1
- (C)
-1 / 0
- (D)
0 / 2
Free CXC Chemistry Paper 1 January 2024 past paper from 2024. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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CSEC Chemistry Paper 1 January 2024 - Free CXC Past Paper with Answers
Free CXC Chemistry Paper 1 January 2024 past paper from 2024. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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When a hydrocarbon molecule is cracked, which of the following smaller molecules are produced? I. An alkane II. An alkene III. An alcohol
I and II only
I and III only
II and III only
I, II and III
Which of the following processes does NOT provide evidence in support of the particulate nature of matter?
Osmosis
Diffusion
Filtration
Brownian motion
Which of the following sets of properties refers to a proton?
+1 / 1
0 / 1
-1 / 0
0 / 2
Which reaction involves the boiling of a fat or oil with aqueous sodium hydroxide (caustic soda)?
Hydrolysis
Dehydration
Saponification
Esterification
How many isomers of butane, C₄H₁₀, are there?
1
2
3
4
Which of the following reactions occurs between propene and bromine?
Addition
Substitution
Precipitation
Condensation
Which of the following terms describes starch?
Giant ionic structure
Giant covalent structure
Simple molecular crystal
Macromolecular structure
What mass of oxygen atoms contains the same number of moles as 112 g of sulfur atoms?
[RAM: O = 16; S = 32]
0.56 g
5.60 g
56.00 g
560.00 g
The atomic number of an element is defined as the number of
protons
electrons
protons and neutrons
electrons and neutrons
Benzene is insoluble in water. A method that can be readily used to separate the benzene and water is
simple filtration
recrystallization
chromatography
use of a separating funnel
Which of the following statements BEST describes a catalyst?
It alters the quantity of the products formed.
It is unchanged physically at the end of a reaction.
It is unchanged chemically at the end of a reaction.
It increase the activation energy of a chemical reaction.
Sublimation is a process in which
a salt is formed
no gas is produced
the solid forms a liquid on heating and then changes back into a solid on cooling
the solid changes to a gas on heating and then changes back into a solid on cooling
Which of the following elements is an anion?
Q
R
S
T
Which of the following salts is prepared by precipitation?
Barium sulfate
Calcium chloride
Magnesium nitrate
Potassium carbonate
A certain base reacted with a salt and produced a gas which turned damp red litmus paper blue. Which of the following ions does the salt contain?
Nitrate(V)
Carbonate
Sulfate(VI)
Ammonium
Isotopes of an element contain
different number of electrons
the same number of neutrons
the same number of protons and different number of neutrons
the same number of protons and different number of electrons
In the electrolysis of aqueous copper(II) sulfate solution using copper electrodes, the anode
increases in mass
decreases in mass
undergoes no change in mass
is the site where reduction occurs
Two solutions are to be mixed in order to demonstrate endothermic change. Which of the following techniques would be MOST appropriate to use?
Taking mass readings
Taking temperature readings
Monitoring the pH of the solutions
Carefully observing colour changes
Which of the following mixtures can be referred to as a standard solution?
Iodine in 50 cm³ of ethanol
30 g of sodium chloride in water
Sodium chloride in 50 cm³ of water
30 g of iodine in 50 cm³ of ethanol
Which of the following substances reacts with an acid, liberating a gas which turns lime water milky?
Methyl orange
Barium chloride
Calcium carbonate
Magnesium metal
Which of the following pairs of elements exhibit allotropy?
Sulfur and carbon
Sulfur and nitrogen
Carbon and chlorine
Nitrogen and phosphorus
Which of the following substances can be described as the oxide of a metal?
Alkali
Base
Salt
Acid
Which of the following pairs of substances can represent Solutions X and Y?
X: KOH(aq) Y: HCl(aq)
X: KOH(aq) Y: H₂O
X: HCl(aq) Y: H₂O
X: HCl(aq) Y: KOH(aq)
Item 24 refers to the following apparatus which is used to measure the relative conductivity of various substances. 6 V DC supply Bulb Graphite rod Graphite rod Substance under investigation
If substances containing one mole of solute per dm³ are investigated, which substance should cause the bulb to glow BRIGHTEST?
Water
Ammonia
Sulfuric acid
Ethanoic acid
Which of the following will NOT conduct electricity?
Solid calcium
Solid calcium chloride
Molten calcium chloride
A solution of calcium chloride in water
Which of the following diagrams illustrates bonding in oxygen?
A new element, R, shows chemical properties similar to the element sodium. What is the correct formula of a compound formed with R and sulfur?
RS
R₂S
RS₂
R₂S₂
Graphite can be used as a lubricant because of the
loose electrons which can move throughout the lattice
weak attraction among the hexagonal layers of carbon atoms
strong attraction among the hexagonal layers of carbon atoms
strong attraction within the hexagonal layers of carbon atoms
When solid lead nitrate is heated, it decomposes giving off nitrogen(IV) oxide and oxygen. The balanced equation for this reaction is
How many moles of ethanoic acid are required to produce 0.5 mol of the ester?
0.05
0.5
1
2
When a piece of magnesium ribbon is burnt in air, magnesium oxide is formed. The magnesium oxide is then placed in water and tested with litmus solution, which turns blue.
The experiment above shows that magnesium oxide is
insoluble
neutral
acidic
basic
Copper and aluminium are both good conductors of electricity, but for overhead electrical cables aluminium is preferred because
aluminium is obtained in a very high degree of purity
aluminium is lighter and resistant to corrosion
copper, a transition metal, forms a coloured coating
copper rapidly reacts with the grease present in air
Which of the following is a list of ALL the raw materials used in the extraction of iron?
Air, iron ore and limestone
Air, coke, cryolite and limestone
Air, coke, iron ore and limestone
Coke, iron ore, bauxite and limestone
Which metal does NOT react with an acid to produce hydrogen gas?
Na
Cu
Al
Fe
Potassium is a metal. From this information ONLY, it may be deduced that potassium
is soft
is very reactive
has a low melting point
is a good conductor of electricity
Which of the following reactions is LEAST likely to occur?
Which of the following elements would NOT form an acidic oxide when burnt in air?
Sulfur
Carbon
Nitrogen
Magnesium
Which of the following procedures can be used to identify ammonia gas?
Placing moist red and blue litmus paper in a jar of the gas
Placing a burning splint in a jar of the gas
Placing a glowing splint in a jar of the gas
Passing the gas through lime water
Ammonia may be produced in the laboratory by heating a mixture of ammonium chloride and
ammonium sulfate
calcium hydroxide
calcium chloride
copper
Item 40 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?
Mg, Zn, Pb
Pb, Zn, Mg
Zn, Mg, Pb
Zn, Pb, Mg
Which of the following gases would be collected by the downward displacement of air?
Oxygen
Chlorine
Ammonia
Carbon dioxide
Which of the following aqueous solutions will produce a yellow precipitate with aqueous potassium iodide?
Lead nitrate
Zinc sulfate
Calcium chloride
Sodium carbonate
The main substances responsible for the production of 'acid rain' are
chlorofluorocarbons
lead compounds in exhaust fumes
sulfur dioxide and sulfur trioxide
carbon dioxide and carbon monoxide
Hexane is an alkane with six carbon atoms per molecule. Which of the following is the formula for hexane?
With which of the following substances would an alkane react?
Steam
Ethanol
Chlorine
Hydrogen
Item 47 refers to the following equation. H H H H | | | | H-C-C=C-C-H + Br2 → X | | H H
Which of the following is the correct structural formula for X?
Item 48 refers to the following equation. Organic acid + Alcohol <=> Ester + Water
The forward reaction is known as
synthesis
hydrolysis
esterification
polymerization
Which of the following types of polymers may be derived from monomers of the type shown below?
Polyester
Polyamide
Polyalkene
Polysaccharide
Which of the following is the fully displayed structural formula of 2-bromobutane?
Item 52 refers to the following compounds.
Which of the following MOST likely identifies P and Q?
Acid / Alcohol
Ester / Acid
Alcohol / Acid
Alcohol / Ester
Item 53 refers to the following structures of two organic compounds, I and II, whose molecular formula is C₃H₈O.
Compounds I and II are known as the
isomers of C₃H₈O
isotopes of C₃H₈O
condensed formulae of C₃H₈O
molecular formulae of C₃H₈O
Item 58 refers to the following compound. CH₃ | H₃C - C - CH₂OH | CH₂ | CH₃ The compound shown above represents an
alcohol
alcohol
alkane
alkene
ester
The disadvantage of using a soapless detergent is that it
is not affected by hard water
causes scum with hard water
is used widely in industries
is non-biodegradable
A chemistry student wishes to determine the presence of ethanol. Which of the following reagents will he need from the laboratory to accomplish this task?
Bromine
Organic acid
A strong reducing agent
Potassium dichromate(VII)