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WorksheetsMCQ practise (exercise 4)
Total questions: 40
Worksheet time: 2hrs 0mins
When heated, magnesium reacts with oxygen in the air to form magnesium oxide, a white powder.
A student investigates the change in mass that occurs during this reaction. He is given a balance and the three sets of apparatus shown.
Which sets of apparatus are suitable for this investigation?
1, 2 and 3
1 and 3 only
2 and 3 only
2 only
Four substances are heated gently. The temperatures at which they start and finish melting are recorded.
Which statement about the substances is correct?
Substance 1 is the only pure substance.
Substance 3 and substance 4 are impure.
Substance 4 is water.
They are all solids at room temperature.
A substance dissolves in water to form a colourless solution. This solution reacts with aqueous silver nitrate in the presence of dilute nitric acid to give a yellow precipitate. What is the possible identity of the substance?
calcium iodide
copper(II) chloride
iron(II) iodide
sodium chloride
Which statements are correct?
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
Which particle contains the greatest number of electrons?
Mg2+
N3–
Ne
S2–
Which substance has a giant covalent structure at room temperature?
methane
sand
sodium chloride
water
One atom of element X and two atoms of element Y react to form an ionic compound. Element X forms a positive ion.Which elements could X and Y be?
A
B
C
D
An element with a high melting point forms an oxide that is gaseous at room temperature.Which type of structure or bonding is present in the element?
giant covalent
ionic
metallic
simple molecular
Which statement explains why aluminium is malleable?
Aluminium has layers of cations that can slide over one another.
Aluminium has layers of electrons that can slide over one another.
Aluminium has weak bonds between protons and a ‘sea of electrons’
Aluminium is covered with a layer of unreactive aluminium oxide.
The incomplete equation for the reaction between ethyne, C2H2, and oxygen is shown. When the equation is balanced, what is the correct value for O2(g)?
2
3
4
5
A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass.
The relative molecular mass of the compound is between 55 and 65.
What is the molecular formula of the compound?
CH2O
C2H4O
C2H4O2
C2H6O2
What is observed during the electrolysis of aqueous copper(II) sulfate using carbon electrodes?
A pink solid is deposited on the anode.
Bubbles form on the negative electrode.
The colour of the solution fades.
The negative electrode becomes smaller.
Four processes using electrolysis are listed.
Which processes produce oxygen at one of the electrodes?
1and 2
2 and 3
2 and 4
3 and 4
Which statements about endothermic reactions are correct?
1 and 3
1 and 4
2 and 3
2 and 4
A fuel is completely burned in air. Carbon dioxide, water and heat are produced. Which energy profile diagram is correct for burning a fuel?
The equation shows the reaction for the manufacture of ammonia.
Which change will decrease the activation energy of the reaction?
addition of a catalyst
decrease in temperature
increase in concentration
increase in pressure
Solid ammonium chloride is heated. The gases ammonia and hydrogen chloride are formed. This is reaction 1.
Ammonia gas is mixed with hydrogen chloride gas. Solid ammonium chloride is formed. This is reaction 2.
Which statement is correct?
Both reaction 1 and reaction 2 are exothermic.
Reaction 2 is reversible.
The equation for reaction 1 is NH5Cl → NH4 + HCl.
The three substances involved in each reaction all have a simple molecular structure.
In a closed flask, gases Q and R reach a dynamic equilibrium.
Which change will move the equilibrium to the right?
adding a catalyst
decreasing the temperature
increasing the pressure
increasing the volume of the flask
Which reaction is a redox reaction?
Mg+2HCl→MgCl2 +H2
MgCO3 +2HCl→MgCl2 +H2O+CO2
MgO+2HCl→MgCl2 +H2O
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
Three separate mixtures of a solution and a solid are made, as shown in the table. The mixtures are warmed.
In which mixtures does gas form?
A
B
C
D
The carbonate, chloride and sulfate of a metal are all soluble in water.What is the metal?
barium
calcium
potassium
silver
Which fertiliser contains the highest percentage of nitrogen by mass?
ammonium nitrate, NH4NO3; formula mass is 80
ammonium phosphate, (NH4)3PO4; formula mass is 149
ammonium sulfate, (NH4)2SO4; formula mass is 132
potassium nitrate, KNO3; formula mass is 101
Which set of conditions is used in the contact process?
A
B
C
D
The diagram shows part of the Periodic Table.
Which two letters represent elements that can react together to form covalent compounds?
W and X
W and Y
X and Y
Y and Z
The Group I metals lithium, sodium and potassium show trends in their melting points and in theirreactions with water.
Which statement is correct going down the group from lithium to potassium?
Their melting points decrease and their reaction with water becomes less vigorous.
Their melting points decrease and their reaction with water becomes more vigorous.
Their melting points increase and their reaction with water becomes less vigorous.
Their melting points increase and their reaction with water becomes more vigorous.
From their position in the Periodic Table, which properties would you expect the elements vanadium, chromium and cobalt to have?
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
The diagram shows the structure of an alloy.
Which statement about alloys is correct?
Alloys can only be formed by mixing copper or iron with other metals.
High carbon steel alloys are soft and easily shaped.
In an alloy there is attraction between positive ions and a ‘sea of electrons’.
The alloy brass has a chemical formula.
Which pair of reagents will undergo a displacement reaction?
Ag(s) and CuSO4(aq)
Cu(s) and MgSO4(aq)
Mg(s) and CaSO4(aq)
Zn(s) and CuSO4(aq)
The reactivity series for some metals, with two gaps labelled X and Y, is shown.
Which row correctly identifies metals X and Y and the method of extraction of Y from its ore?
Metal X: Al ; Metal Y: Fe ; Method of extraction of Y: electrolysis
Metal X: Al ; Metal Y: Fe ; Method of extraction of Y: reduction with carbon
Metal X: Fel ; Metal Y: Al ; Method of extraction of Y: electrolysis
Metal X: Fel ; Metal Y: Al ; Method of extraction of Y: reduction with carbon
Iron can be extracted from the ore haematite, Fe2O3.
What is the maximum mass of iron that could be produced from 500 kg of haematite?[Ar: O, 16; Fe, 56]
160kg
240kg
350kg
420kg
Aluminium is used to make saucepans because of its apparent lack of reactivity.
Which property of aluminium explains its unreactivity?
It has a layer of oxide on its surface.
It has a low density.
It is a good conductor of electricity.
It is in Group III of the Periodic Table.
Pollutant gases are released by the bacterial decay of vegetable matter. The bacterial decay of vegetable matter is the main source of which gas?
carbon monoxide
methane
nitrogen dioxide
sulfur dioxide
Several different treatments are used to purify the water supply.
Which impurities can be removed by which treatment?
A
B
C
D
Which statement about the homologous series of alkanes is correct?
Alkanes are unsaturated hydrocarbons.
Alkanes all have the general formula CnH2n.
The boiling points decrease as the number of carbon atoms per molecule increases.
The liquid alkanes become more viscous as the mass of the molecules increases.
Which compound has the empirical formula with the greatest relative formula mass?
C2H6
C4H10
C5H10
C6H6
Which statement about vegetable oil and the margarine made from it is correct?
Both are liquids at room temperature.
Both occur naturally.
Margarine has the higher melting point.
Vegetable oil has fewer carbon-carbon double bonds than margarine.
When ethene reacts with steam to form ethanol, which type of reaction takes place?
addition
fermentation
polymerisation
reduction
An ester is formed from a carboxylic acid and an alcohol.How does the number of carbon, hydrogen and oxygen atoms in an ester differ from the total number of these atoms in the carboxylic acid and alcohol from which the ester is formed?
A
B
C
D
Poly(lactic) acid is a polymer used to make biodegradable cups. The partial structure of poly(lactic) acid is shown.
Which statements apply to poly(lactic) acid?
1-It is made by addition polymerisation.
2-It is made by condensation polymerisation.
3-It is a polyester.
4-The monomer used to make it is ethene.
1 and 3
1 and 4
2 and 3
2 and 4
Two large molecules, P and Q, both contain the same linkage. P occurs naturally but Q does not.
Which row could be P and Q?
A
B
C
D
