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WorksheetsG9 IGCSE Chemistry Workout #1
Total questions: 40
Worksheet time: 20mins
The dyes in a sweet are separated using chromatography.
Which dyes are present in the sweet?
1 and 2
1 and 3
2 and 4
3 and 4
Which covalent molecule contains the most shared pairs of electrons?
CH4
CO2
C2H4
NH3
How many atoms of metals and of non-metals are shown in the formula Na2SO4?
atoms of metals = 1; atoms of non-metals = 1
atoms of metals = 1; atoms of non-metals = 2
atoms of metals = 2; atoms of non-metals = 4
atoms of metals = 2; atoms of non-metals = 5
Which diagram represents molecules of a compound?
A
B
C
D
A beaker containing solid carbon dioxide is placed in a fume cupboard at room temperature. The carbon dioxide becomes gaseous.
Which process describes this change of state?
boiling
condensation
evaporation
sublimation
Which statement about paper chromatography is correct?
A solvent is needed to dissolve the paper.
Paper chromatography separates mixtures of solvents.
The solvent should cover the baseline.
The baseline should be drawn in pencil.
The diagrams show four pieces of laboratory equipment.
Which equipment is essential to find out if dissolving a salt in water is an exothermic process?
Thermometer only.
Balance and thermometer
Pipette and thermometer
Balance and stop-clock
Iodine, I, has a lower relative atomic mass than tellurium, Te, but is placed after it in the Periodic Table.
Which statement explains why iodine is placed after tellurium in the Periodic Table?
Iodine has fewer neutrons than tellurium
Iodine has fewer protons than tellurium.
Iodine has more neutrons than tellurium.
Iodine has more protons than tellurium.
Substance Q has a high melting point and conducts electricity both when molten and when dissolved in water.
What is Q?
What is Q?
calcium chloride
diamond
iron
silver chloride
Elements X and Y form an ionic compound, XY.
In which group of the Periodic Table is X found and how is the bond between X and Y formed?
A
B
C
D
Elements X and Y form an ionic compound, XY.
In which group of the Periodic Table is X found and how is the bond between X and Y formed?
A
B
C
D
Which statement about gases is correct?
Gases are difficult to compress when pressure is applied.
The particles in gases are close together.
The particles in gases have a random arrangement.
The particles in gases move slowly past each other.
Which statement describes isotopes?
Isotopes of the same element have different electron arrangements.
Isotopes of the same element have different nuclear charges.
Isotopes of the same element have nuclei with masses that are the same.
Isotopes of the same element have the same number of protons.
Substance X conducts electricity.
What is X?
a typical covalent compound in the liquid state
a typical covalent compound in the solid state
a typical ionic compound in the liquid state
a typical ionic compound in the solid state
Which statement describes the elements in Group I?
They all form ions by gaining electrons.
They all form ions with the same charge.
They have different numbers of electrons in their outer shells.
They all have the same number of electron shells.
Which statement about the isotopes of an element is correct?
Their physical properties are different because they have different proton numbers.
Their atomic masses are different because they have different numbers of electron shells.
They have the same chemical properties because they have the same number of electrons in their outer shells.
They have the same physical properties because they have the same number of neutrons in their nuclei.
Which two molecules contain the same number of electrons?
Cl2 and SO2
CH4 and H2O
CO and NH3
CO2 and HCl
Which statement describes the lattice structure of a metal?
The lattice consists of alternating positive ions and negative ions.
The lattice consists of neutral atoms arranged in layers.
The lattice consists of positive ions in a ‘sea of electrons’.
The lattice consists of neutral atoms in a ‘sea of electrons’.
Argon is a noble gas used to fill light bulbs.
What is the approximate percentage of argon in air?
1%
20%
79%
99%
The diagrams show experiments involving the rusting of iron.
A student predicted the following results.
1 In tube P, the iron nails rust.
2 In tube Q, the iron nails do not rust.
3 In tube R, the iron nails do not rust.
Which predictions are correct?
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
Four physical changes are listed.
1 condensation
2 evaporation
3 freezing
4 sublimation
In which changes do the particles move further apart?
1 and 2
1 and 3
2 and 4
3 and 4
The diagram shows liquid in a burette and in a measuring cylinder.
Which shows the readings for the burette and the measuring cylinder?
burette = 27.8; measuring cylinder = 42
burette = 27.8; measuring cylinder = 44
burette = 28.2; measuring cylinder = 42
burette = 28.2; measuring cylinder = 44
Substance L melts at –7 °C and is a brown liquid at room temperature.
Which temperature is the boiling point of pure L?
–77 °C
–7 °C to +7 °C
59 °C
107 °C to 117 °C
What is the nucleon number of an atom?
the number of electrons, neutrons and protons in the nucleus
the number of neutrons and protons in the nucleus
the number of neutrons in the nucleus
the number of protons in the nucleus
Caesium, Cs, is an element in Group I of the Periodic Table.
When caesium reacts it forms a positive ion, Cs+.
How is a caesium ion formed?
A caesium atom gains a proton.
A caesium atom gains an electron.
A caesium atom loses an electron.
A caesium atom shares an electron.
Which statement about graphite and diamond is correct?
Diamond has a high melting point but graphite does not.
Graphite and diamond both conduct electricity.
Graphite and diamond both have giant structures.
Graphite is ionic and diamond is covalent.
The Periodic Table lists all the known elements.
Elements are arranged in order of ....... 1 ....... number.
The melting points of Group I elements ....... 2 ....... down the group.
The melting points of Group VII elements ....... 3 ....... down the group.
Which words correctly complete gaps 1, 2 and 3?
A
B
C
D
Which statements about Group I and Group VII elements are correct?
1 In Group I, lithium is more reactive than potassium.
2 In Group VII, chlorine is more reactive than fluorine.
statement 1 = correct; statement 2 = correct
statement 1 = correct; statement 2 = incorrect
statement 1 = incorrect; statement 2 = correct
statement 1 = incorrect; statement 2 = incorrect
Which statement describes transition elements?
They have high densities and high melting points.
They have high densities and low melting points.
They have low densities and high melting points.
They have low densities and low melting points.
Which trend occurs across the period from sodium to argon?
a change from metal to non-metal
an increase in melting point
a more violent reaction with water
an increase in electrical conductivity
Why is argon used in lamps?
Argon forms molecules when electricity is passed through it.
Argon is inert and so does not react with the hot filament.
Argon is less dense than air.
Argon produces light when it burns.
Which two properties are physical properties of all pure metals?
property 1 = brittle
property 2 = poor conductor of heat
property 1 = good conductor of electricity
property 2 = malleable
property 1 = malleable
property 2 = low density
property 1 = brittle; property 2 = poor conductor of heat
Which statement about the uses of aluminium, copper and iron is correct?
Aluminium is used for aircraft manufacture because it has a high density.
Aluminium is used for food containers because it is a good conductor of electricity.
Copper is used for cooking utensils because it is a good conductor of heat.
Stainless steel is used for car bodies because it corrodes easily.
The diagram shows the result of dropping a purple crystal into water.
Which processes take place in this experiment?
chemical reaction = yes; diffusing = yes; dissolving = yes
chemical reaction = yes; diffusing = no; dissolving = yes
chemical reaction = no; diffusing = no; dissolving = yes
chemical reaction = no; diffusing = yes; dissolving = yes
The four pieces of apparatus shown below are used in chemical experiments.
Which statement about the apparatus is correct?
The burette measures the volume of liquid added in a titration.
The measuring cylinder measures the mass of a substance used in an experiment
The pipette measures the volume of gas given off in a reaction.
The thermometer measures the density of a solution.
The diagram shows the structure of an atom of element X.
What is X?
boron
carbon
sodium
sulfur
The diagrams show four particles.
Which two diagrams show atoms that are isotopes of each other?
1 and 2
1 and 3
2 and 3
2 and 4
The ‘lead’ in a pencil is made of a mixture of graphite and clay.
When the percentage of graphite is increased, the pencil slides across the paper more easily.
Which statement explains this observation?
Graphite has a high melting point.
Graphite is a form of carbon.
Graphite is a lubricant.
Graphite is a non-metal
Element X is in Group I of the Periodic Table. X reacts with element Y to form an ionic compound.
Which equation shows the process that takes place when X forms ions?
X + e– → X
X – e– → X–
X + e– → X
X – e– → X+
Solid F is an element.
Solid G is a compound.
Neither solid conducts electricity but G conducts electricity when dissolved in water.
These properties suggest that F is ……1…… and that G is ……2…… with ……3…… bonds.
Which words correctly complete gaps 1, 2 and 3?
A
B
C
D
