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Worksheetschemistry igcse 2016 past year
Total questions: 40
Worksheet time: 28mins
A filtration is used to remove sand from a mixture of water, salt and sand. What will be in the filtrate?
a mixture of an element and a compound
a mixture of two compounds
one compound only
one element only
Which types of substance do the chemical symbols C, CO2 and O2 represent?
C: compound, CO2: compound, O2: element
C: compound, CO2: element, O2: compound
C: element, CO2: compound, O2: element
C: element, CO2: element, O2: compound
Which element forms an ionic compound with a sodium?
Magnesium
Chlorine
Helium
Potassium
Electrolysis is used separate lead(II) bromide. Lead is formed at cathode. Which statement about the electrolysis is correct?
A green gas is given off at anode
Anode is connected to negative end of the battery
Only a physical change takes place when a current is passed
The electrolyte is in the molten state
What happens during all endothermic changes?
A gas is produced
Solids melt
The temperature decreases
There is a colour change
Which statement describes a redox reaction?
An acid reacts with a base
Only oxidation takes place
Oxygen is transferred from one substance to another
Two substances are both reduced
Dilute hydrochloric acid is added to solid X.
Hydrogen gas is produced.
What is X?
zinc
zinc carbonate
zinc hydroxide
zinc oxide
Which test is used to identify ammonia?
A glowing splint relights
Damp blue litmus paper is bleached
Damp red litmus paper turns blue
Limewater turns milky
A soft metal reacts vigorously with cold water. What is the position of this metal in the Periodic Table?
A
B
C
D
Which statement describes a transition element?
a metal that forms white compounds
a metal with a high melting point
a metal with a low density
a non-metal that forms coloured compounds
P, Q, R and S are four metals.
P forms bubbles of gas with dilute acid but does not react with cold water.
Q reacts slowly with cold water.
R does not react with dilute acid.
S reacts rapidly with cold water.
What is the order of reactivity from most to least reactive?
R → P → Q → S
R → Q → P → S
S → P → Q → R
S → Q → P → R
A colourless liquid is tested with blue cobalt chloride paper.
The paper turns pink.
Which statement about the liquid must be correct?
it contains water
it is acidic
is is anhydrous
it is pure water
Which reaction involves combustion?
calcium carbonate → calcium oxide + carbon dioxide
methane + oxygen → carbon dioxide + water
sodium carbonate + hydrochloric acid → sodium chloride + water + carbon dioxide
sodium hydroxide + hydrochloric acid → sodium chloride + water
What is the name of the type of compound containing only carbon and hydrogen?
carbohydrate
carbonate
hydrocarbon
hydroxide
Question in the picture
A
B
C
D
A beaker contains vinegar is put in a bowl with water. Solid sodium carbonate is added to vinegar in the beaker and stirred. The water in the bowl freezes.
Which statement about the reaction explains why the water freezes?
it is a redox reaction
it is an endothermic reaction
it is catalysed by sodium carbonate
it is thermal decomposition
Carbon dioxide reacts with carbon.
carbon dioxide + carbon → carbon monoxide
Which describes what happens to the carbon dioxide and to the carbon during the reaction?
carbon dioxide: oxidised, carbon: oxidised
carbon dioxide: oxidised, carbon: reduced
carbon dioxide: reduced, carbon: oxidised
carbon dioxide: reduced, carbon: reduced
Which element reacts with dilute sulfuric acid to form a salt?
carbon
copper
sulfur
zinc
The results of two tests on substance Q are shown.
test 1: add dilute hydrochloric acid to solid Q
result: bubbles of colourless gas, R, which turns limewater milky
test 2: add aqueous sodium hydroxide to a solution of Q
result: green precipitate
Which cation is present in Q and what is gas R?
Q: iron (II), R: carbon dioxide
Q: iron (II), R: chlorine
Q: iron (III), R: carbon dioxide
Q: iron (III), R: chlorine
Which metal reacts with dilute hydrochloric acid but does not react with cold water?
potassium
calcium
sodium
zinc
What is a chemical test for water?
it boils at 100oC
it turns blue cobalt chloride paper pink
it turns blue copper sulfate crystals white
it turns pink litmus paper blue
Petroleum is a mixture of hydrocarbon molecules.
Which describes the method of separation of petroleum and the type of bond in hydrocarbon molecules?
distillation; covalent bond
distillation; ionic bond
fractional distillation; covalent bond
fractional distillation; ionic bond
Which describes an element and a compound?
element: contains more than one type of atom
compound: contains elements chemically combined
element: contains more than one type of atom
compound: contains elements mixed together
element: contains only one type of atom
compound: contains elements chemically combined
element: contains only one type of atom
compound: contains elements mixed together
Which temperature changes occur during exothermic and endothermic reactions?
exo: decrease, endo: increases
exo: decrease, endo: no change
exo: increases, endo: decreases
exo: increases, endo: no change
What is a catalyst?
a substance that decreases the rate of reaction and is chemically changed at the end of the reaction
a substance that decreases the rate of reaction and is chemically unchanged at the end of the reaction
a substance that increases the rate of reaction and is chemically changed at the end of the reaction
a substance that increases the rate of reaction and is chemically unchanged at the end of the reaction
Which word equation represents the reaction of an acid with a carbonate?
acid + carbonate → salt + carbon dioxide
acid + carbonate → salt + carbon dioxide + water
acid + carbonate → salt + hydrogen + water
acid + carbonate → salt + water
The results of two tests on substance R are shown.
test 1: add aqueous sodium hydroxide
result: red-brown precipitate formed, insoluble in excess
test 2: dilute nitric acid added followed by silver nitrate solution
result: white precipitate formed
What is R?
iron(II) carbonate
iron(III) carbonate
iron(II) chloride
iron(III) chloride
W, X, Y and Z are four metals.
W forms a compound that is used to speed up chemical reactions.
X forms coloured compounds.
Y has a high melting point.
Z has a low density.
Which metals are transition elements?
W, X and Y
W and X only
X, Y and Z
Y and Z only
Which element does not produce a gas when added to dilute hydrochloric acid?
copper
iron
magnesium
zinc
Which processes are used in the purification of the water supply?
fractional distillation and chlorination
fractional distillation and crystallisation
filtration and chlorination
filtration and crystallisation
Which fuel is not obtained from petroleum?
coal
gasoline
diesel
refinery gas
Question on the picture
A
B
C
D
Question on the picture
P is a single substance
Q contains two substances
R contains two substances
S is a single substance
Which particle has the smallest mass?
atom
electron
neutron
proton
Which statement about compounds is correct?
An ionic compound contains two metallic elements bonded together.
In an ionic compound, metal ions are negatively charged.
When metals combine with non-metals, electrons are shared between the atoms.
When two non-metals combine, molecules are formed.
Solid calcium oxide reacts with cold water forming calcium hydroxide.
As the cold water is added, steam is seen coming from the solid.
Which statement describes the reaction?
It is endothermic and the temperature decreases.
It is endothermic and the temperature increases.
It is exothermic and the temperature decreases.
It is exothermic and the temperature increases.
Hydrochloric acid reacts with aqueous sodium hydroxide to form a neutral solution of sodium chloride.
Which process must be used to obtain dry crystals of sodium chloride from this solution?
distillation
evaporation
filtration
neutralisation
Which statement describes a trend in the elements going down Group VII?
They are darker in colour.
They are displaced from their salts by elements lower down the group.
They are more reactive.
They have lower boiling points.
Many coins are made of an alloy.
Which property of an alloy makes it suitable for coins?
conducts electricity
expensive to buy
resistant to corrosion
soft and malleable
What is formed during the complete combustion of a hydrocarbon?
carbon dioxide and water
carbon dioxide only
carbon monoxide and carbon dioxide
carbon monoxide only
