Chemistry Web Questions

8/6/2019 Chemistry Web Questions

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Section A:

Properties of matter1 In an atom the neutron is found:

A in orbit around the nucleus.

B in the nucleus.

C in the shells.

D only in heavy isotopes.

2 In terms of mass, compared to a proton, an electron:

A has the same mass.

B is slightly lighter.

C is much lighter.

D weighs more.

3 The Periodic Table is arranged in order of:

A atomic mass.

B ionic charge.

C proton number.

D type of element.

4 The electrical charges on a proton and an electron are:

A both negative.

B equal but opposite.

C completely unrelated in size.

D zero.

5 The number of electrons in a full electron shell is:

A always two.

B always eight.

C sometimes two and sometimes eight.

D from one to eight.


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6 When gas particles spread out we call it:

A diffusion.

B condensation.

C sublimation.

D boiling.

7 The only one of the following which is NOT a change of state is:

A melting.

B freezing.

C boiling.

D dissolving.

8 When solid carbon dioxide turns straight into a gas we call it:

A melting.

B sublimation.

C evaporation.

D drying.

9 Particles are furthest apart in:

A liquids.

B solutions.

C gases.

D solids.

10 Ammonia gas spreads out faster than hydrogen chloride, showing that it is:

A a lighter molecule.

B a bigger molecule.

C a simpler molecule.

D a heavier molecule.

11 The number of electrons shared in a single covalent bond is:

A 1

B 2

C 4

D 8


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12 The group of elements whose molecules and atoms are the same is called:

A halogens.

B transition elements.

C noble gases.

D alkaline earths.

13 The number of double bonds in a molecule of carbon dioxide is:

A 0

B 1

C 2

D 4

14 All of the following have a charge of 1 EXCEPT for:

A chloride.

B fluoride.

C bromide.

D iodine.

15 The type of bonding that involves loss or gain of electrons is called:

A ionic.

B covalent.

C molecular.

D metallic.

16 In metals, the particles forming the structure are all:

A atoms.

B ions.

C molecules.

D protons.

17 The alloy, brass, contains copper and:

A tin.

B aluminium.

C iron.

D zinc.


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18 The proportions of elements in a pure compound are always:

A the same.

B one-to-one.

C different.

D variable.

19 None of these solutions in water conducts electricity EXCEPT for:

A glucose.

B sugar.

C sodium chloride.

D ethanol.

20 All of these elements form allotropes EXCEPT for:

A argon.

B carbon.

C phosphorus.

D oxygen.

21 We can separate an insoluble solid from a liquid using:

A chromatography.

B filtration.

C magnets.

D a separating funnel.

22 Alcohol can be separated from beer using:

A filtration.

B distillation.

C decanting.

D dissolving.

23 All of these are fractions from crude oil EXCEPT for:

A petrol.

B kerosene.

C diesel.

D ethanol.


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24 In a water condenser the cooling water enters at:

A the lower end.

B the upper end.

C the middle.

D either end.

25 One example of an emulsifying agent is:

A salt.

B soap.

C sucrose.

D water.


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Section B:

Chemical calculations26 The charge on a sodium ion is always:

A 1

B +2

C +1

D 2

27 The number of atoms in a diatomic molecule is:

A 3

B 4

C 2

D 6

28 The state symbol for a solution in water is:

A L

B w

C s

D aq

29 The number of atoms in this formula, H2SO4, is:

A 3

B 7

C 4

D 5

30 When an element combines with oxygen we get an:

A oxalate.

B ozonide.

C oxide.

D dioxide.


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31 The number of particles in a mole of any gas is always:

A different.

B the same.

C one.

D variable.

32 The standard atom used for mass calculations is:

A carbon.

B hydrogen.

C carbon-12.

D carbon-14.

33 The simplest ratio of atoms in a compound is given by the:

A molecular formula.

B formula mass.

C structural formula.

D empirical formula.

34 The two common varieties of chlorine atoms are called:

A molecules.

B isomers.

C isotopes.

D formulas.

35 The empirical formula, C6H12O6, gives the simplest ratio as:

A 1 to 2.

B 6 to 12.

C 6 to 12 to 6.

D 1 to 2 to 1.

36 The number of litres in 2000 cm3 is:

A 2000.

B 20.

C 100.

D 2.


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37 The number of kilos in 1 metric tonne is:

A 1000.

B 1.

C 100.

D 10.

38 1 mole of gas occupies 24 litres at room temperature and pressure, so the number of moles in

72 litres is:

A 72.

B 2.4.

C 3.

D 7.2.

39 In the equation, carbon monoxide + oxygen carbon dioxide, a reactant is:

A carbon.

B carbon dioxide.

C heat.

D oxygen.

40 If the relative atomic mass (RAM) = 1 for hydrogen and 16 for oxygen, the formula mass forH2O2 is:

A 17.

B 18.

C 32.

D 34.


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Section C:

Salts, reactivity and titration41 The pH scale runs from 1 to:

A 7.

B 100.

C 14.

D 20.

42 Any solution with a pH below 7 must be:

A acid.

B neutral.

C alkali.

D water.

43 When metals react with acids they give a salt and:

A water.

B alkali.

C hydrogen.

D hydrogen oxide.

44 An insoluble metal oxide can be described as:

A base.

B acid.

C alkali.

D precipitate.

45 When an acid neutralises an alkali the pH is likely to be:

A low.

B 14.

C above 7.

D 7.


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46 The Haber Process is used to make:

A sulphuric acid.

B iron.

C ammonia.

D limestone.

47 The catalyst in the Haber Process is:

A manganese dioxide.

B vanadium oxide.

C iron.

D platinum.

48 A reaction that gives out heat is said to be:

A cold.

B endothermic.

C insulated.

D exothermic.

49 To make fertilisers and explosives we need:

A carbon dioxide.

B sulphur.

C ammonia.

D charcoal.

50 Raising the temperature of a reversible reaction always encourages the:

A forward reaction.

B endothermic reaction.

C reverse reaction.

D exothermic reaction.

51 Hydrochloric acid forms salts called:

A hydrides.

B hydrates.

C chlorides.

D chlorates.


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52 To complete the reaction: acid + carbonate salt + carbon dioxide + ?, we must add the word:

A hydrogen.

B water.

C product.

D reactant.

53 A salt that is anhydrous contains no:

A metal.

B crystals.

C water.

D ions.

54 When two solutions are mixed and give a solid product we call it:

A neutralisation.

B precipitation.

C hydration.

D combination.

55 Iron chloride can be prepared from the reaction of iron and:

A chloride.

B salt.

C chlorine.

D chlorate.

56 In the reactivity series of metals the order is: sodium, calcium, magnesium, aluminium, which

means that the most reactive metal is:

A aluminium.

B sodium.

C calcium.

D magnesium.

57 When black copper oxide is heated with carbon, brown copper metal is produced, which means

that compared to copper, carbon is the:

A stronger.

B more reactive.

C less reactive.

D metal.


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58 Reactive metals such as potassium react with water to give hydrogen and:

A an alkali.

B oxygen.

C a precipitate.

D an acid.

59 Oxidation can include all of these EXCEPT for:

A loss of electrons.

B reaction with oxygen.

C forming an oxide.

D gain of electrons.

60 When zinc metal is added to copper sulphate solution the products are copper and zinc

sulphate solution, so the material that has been displaced must be:

A zinc.

B copper sulphate.

C copper.

D zinc sulphate.

61 g/dm3

are units of:A molarity.

B concentration.

C pH.

D mass.

62 Dividing the mass in grams by the mass of 1 mole in grams gives:

A molarity.

B number of moles.

C concentration.

D dilution.

63 In a titration the long tube with a volume scale is a:

A pipette.

B beaker.

Cburette.

D flask.


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64 1 mole of sodium carbonate weighs 106 g, so the number of moles in 318 g will be:

A 2

B 31.8

C 3

D 10

65 A salt that contains water of crystallisation is:

A anhydrous.

B hydrated.

C wet.

D crystalline.


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Section D:

Rates, energy and electrolysis

66 The rate of reaction between marble and hydrochloric acid can be speeded up by using:

A larger pieces of marble.

B a lower concentration of acid.

C a higher temperature.

D no catalyst.

67 If a reaction takes 50 seconds at 25 C, then at 50 C the time for the reaction in seconds is

likely to be about:

A 60.

B 100.

C 50.

D 30.

68 More collisions between particles are likely to happen if a solution is made:

Amore concentrated.

B colder.

C less concentrated.

D more dilute.

69 Powders react faster than lumps because they have:

A less surface area.

B more surface area.

C more energy.

D more pressure.

70 If a flask containing marble and acid is placed on a balance, the mass decreases steadily with

time, which means that:

A the reaction is over.

B the reaction is speeding up.

C a gas is escaping from the flask.

D the reaction is in equilibrium.


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71 In an endothermic reaction:

A energy is released.

B the products have less energy than the reactants.

C energy is absorbed.

D the products have the same energy as the reactants.

72 We use expanded polystyrene cups for heat of reaction experiments because the cups are:

A cheap.

B good conductors.

C the right size.

D good insulators.

73 To work out the heat change in a reaction we need to know just three things, the mass, the

temperature change and the:

A specific heat of water.

B starting temperature.

C end temperature.

D room temperature.

74 The units we use for heat given out by a reaction are:A degrees Celsius.

B degrees Kelvin.

C joules.

D moles.

75 All of these reactions are exothermic EXCEPT for:

A combustion.

B neutralisation.

C burning.

D decomposing limestone.

76 In electrolysis the anode is the:

A positive electrode.

B battery terminal.

Cnegative electrode.

D electrolyte.


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77 The voltages from the electrochemical series are 2.92 for potassium and +0.34 for copper,

which shows that:

A copper is more reactive.

B potassium is less reactive.

C potassium does not react at all.

D potassium is more reactive.

78 To electrolyse solid lead bromide it must first be heated so that:

A there is more energy.

B the ions can move freely.

C the atoms can move freely.

D ions can form.

79 At the cathode all of these can happen EXCEPT for:

A positive ions gain electrons.

B cations gain electrons.

C anions lose electrons.

D reduction.

80 A liquid compound that conducts electricity is:A mercury.

B an electrolyte.

C an electrode.

D made of molecules.

81 For Mg++ to turn into an atom of magnesium metal it must:

A gain one electron.

B lose two electrons.

C gain two protons.

D gain two electrons.

82 When dilute sulphuric acid is electrolysed the two gases produced are hydrogen and:

A oxygen.

B sulphur dioxide.

Csulphur trioxide.

D hydrogen sulphide.


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83 One Faraday represents:

A a temperature.

B one mole of electrons.

C the charge on one electron.

D the unit of electric current.

84 Quantity of electricity in coulombs = current in amps multiplied by:

A voltage in volts.

B resistance.

C time in minutes.

D time in seconds.

85 In electrolysing a solution of copper sulphate using copper electrodes, the anode:

A is negative.

B loses mass.

C stays the same.

D gains mass.

86 All of these are compounds EXCEPT for:

A magnetite.

B haematite.

C native gold.

D pyrite.

87 When zinc sulphide is heated in air the gas produced is:

A zinc oxide.

B sulphur trioxide.

C steam.

D sulphur dioxide.

88 When aluminium is extracted by electrolysis, cryolite is added to:

A raise the temperature.

B purify the aluminium.

C lower the temperature.

D conduct electricity.


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89 All of these materials are used in a blast furnace EXCEPT for:

A limestone.

B oxygen.

C iron ore.

D air.

90 To make car bodies we use:

A manganese steel.

B stainless steel.

C mild steel.

D high carbon steel.


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Section E:

Chemical trends91 In the modern Periodic Table the elements are arranged:

A alphabetically.

B in order of atomic mass.

C in order of neutron number.

D in order of proton number.

92 The halogens are found in:

A Period 7.

B Group 2.

C Group 7.

D Group 0.

93 Transition metals have all of these properties EXCEPT for:

A high melting points.

B coloured compounds.

C soft to cut.

D malleable.

94 Potassium reacts quickly with water but we do not use it with acids because:

A it does not react.

B it is dangerous.

C it is too slow.

D it forms a solid base instead.

95 You never find native magnesium because:

A it is so rare.

B it always occurs as alloys.

C it is too reactive.

D it is too similar to other silvery metals.


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96 The halogen, bromine, at room temperature is a:

A black solid.

B brown gas.

C brown liquid.

D pale yellow gas.

97 At 20 C all of the halogens are:

A gases.

B oxidising agents.

C neutralising agents.

D reducing agents.

98 When potassium burns in chlorine, the material that is oxidised is called:

A chlorine.

B chloride.

C potassium.

D potassium chloride.

99 With iodine, starch changes colour to:

A blue-black.

B green.

C brown.

D red.

100The halogen used to make bleach is called:

A iodine.

B fluorine.

C bromine.

D chlorine.

101All of the following are non-metals EXCEPT for:

A hydrogen.

B iodine.

C calcium.

D carbon.


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102 The non-metal used to make margarine is:

A hydrogen.

B chlorine.

C oxygen.

D carbon.

103 When limestone is heated strongly it changes into:

A calcium hydroxide.

B quicklime.

C calcium carbonate.

D slaked lime.

104 The energy used in thermal decomposition is:

A electricity.

B light.

C heat.

D mechanical.

105 Common salt can be used to make all of these EXCEPT for:

A chlorine.

B hydrogen.

C sodium hydroxide.

D glass.

106 Which one of the following gases is considerably heavier than air?

A hydrogen

B carbon dioxide

C ammonia

D nitrogen

107 The gas that relights a glowing splint is:

A hydrogen.

B sulphur dioxide.

C oxygen.

D carbon dioxide.


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108 Adding mineral water to anhydrous copper sulphate turns it:

A red.

B pink.

C colourless.

D blue.

109 A flame test colour of red could indicate the presence of a compound of:

A barium.

B sodium.

C lithium.

D copper.

110 The only common gas that turns moist red litmus paper blue is:

A hydrogen chloride.

B ammonia.

C carbon monoxide.

D sulphur dioxide.


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Section F:

Organic chemistry111 Hydrocarbons contain carbon and:

A oxygen.

B water.

C hydrogen.

D hydrates.

112 The alkane compound with seven carbon atoms is:

A methane.

B hexane.

C nonane.

D heptane.

113 Different structures based on the same molecular formula are called:

A isobars.

B isotopes.

C isomers.

D branched chains.

114 All of these are alkenes EXCEPT for:

A ethene

B ethane

C hexene

D propene

115 When large molecules are broken down into smaller ones it is called:

A fractionation.

B cracking.

C polymerisation.

D distillation.


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116 The alcohol in beer and spirits is called:

A ethane.

B methanol.

C ethanol.

D glycol.

117 Biological catalysts in yeast are called:

A enzymes.

B carbohydrates.

C saturated.

D oxidising agents.

118 Alcohol can be made by fermentation of all these EXCEPT for:

A cane sugar.

B sugar beet.

C potatoes.

D petroleum.

119 The number of carbon atoms in the alcohol, pentanol, is:

A three.

B five.

C six.

D seven.

120 The sharp-tasting compound in vinegar is:

A methanoic acid.

B hydrochloric acid.

C ethanoic acid.

D phosphoric acid.

121 A molecule of ethene can be described as all of these EXCEPT for:

A unsaturated.

B monomer.

C polymer.

D gas.


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122 A plastic that softens every time it is heated is said to be:

A thermoplastic.

B reactive.

C thermoset.

D bakelite.

123 The monomer used to make poly(propene) is called:

A polythene.

B polyvinyl.

C propane.

D propene.

124 All of these are carbohydrates EXCEPT for:

A glucose.

B starch.

C ethanol.

D sucrose.

125 The type of polymerisation used to make polythene is called:

A condensation.

B addition.

C subtraction.

D hydrolysis.


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131 Food can be preserved in all of these ways EXCEPT for:

A drying.

B removing salt.

C removing oxygen.

D bottling.

132 All of these are used as food additives EXCEPT for:

A vinegar.

B sugar.

C salt.

D benzene.

133 The main metal in tin cans used to preserve food is:

A steel.

B tin.

C zinc.

D aluminium.

134 The metal used in food containers whose surface is protected by a strong oxide layer is:

A iron.

B aluminium.

C steel.

D zinc.

135 Candied fruits are preserved in a strong solution of:

A vinegar.

B citric acid.

C lemon juice.

D sugar.

136 The second most common gas in the atmosphere is:

A nitrogen.

B carbon dioxide.

C oxygen.

D argon.


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137 The Earths first atmosphere contained all of these gases EXCEPT for:

A ammonia.

B steam.

C oxygen.

D carbon dioxide.

138 All of these are properties of carbon monoxide EXCEPT for:

A colourless.

B odourless.

C toxic.

D turns lime water cloudy.

139 The active catalyst in a cars catalytic converter is:

A iron.

B aluminium oxide.

C ceramic.

D platinum.

140 Nitrogen fixation produces:

A nitrogen.

B compounds of nitrogen.

C nitric acid.

D water.

141 A ballpoint pen mark can be removed using:

A water.

B hydrogen peroxide.

C meths.

D soap.

142 To remove limescale from a tap you need:

A an alkali.

B salt water.

C ammonia solution.

D an acid.


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143 All of these are ordered crystalline structures EXCEPT for:

A salt.

B glass.

C lead sulphide (lead ore).

D zinc metal.

144 The common name for silicon dioxide is:

A clay.

B soda ash.

C sand.

D limestone.

145 The following are all natural materials EXCEPT for:

A cotton.

B jute.

C nylon.

D hemp.

146 The major plant nutrients written as NPK refer to phosphorus, nitrogen and:

A calcium.

B sodium.

C potassium.

D iron.

147 To make cell walls, plants must have:

A magnesium.

B calcium.

C trace elements.

D nitrogen.

148 Acid soils can be neutralised by adding:

A sand.

B clay.

C lime.

D humus.


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149 All of these are trace elements EXCEPT for:

A nitrogen.

B copper.

C zinc.

D boron.

150 Herbicides are used to destroy:

A pests.

B insects.

C weeds.

D herbivores.


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Chemistry answers1 B 2 C 3 C 4 B 5 C

6 A 7 D 8 B 9 C 10 A

11 B 12 C 13 C 14 D 15 A

16 B 17 D 18 A 19 C 20 A

21 B 22 B 23 D 24 A 25 B

26 C 27 C 28 D 29 B 30 C

31 B 32 C 33 D 34 C 35 D

36 D 37 A 38 C 39 D 40 D

41 C 42 A 43 C 44 A 45 D

46C

47C

48D

49C

50B

51 C 52 B 53 C 54 B 55 C

56 B 57 B 58 A 59 D 60 C

61 B 62 B 63 C 64 C 65 B

66 C 67 D 68 A 69 B 70 C

71 C 72 D 73 A 74 C 75 D

76 A 77 D 78 C 79 C 80 B

81 D 82 A 83 B 84 D 85 B

86 C 87 D 88 C 89 B 90 C

91 D 92 C 93 C 94 B 95 C

96 C 97 B 98 C 99 A 100 D

101 C 102 A 103 B 104 C 105 D

106 B 107 C 108 D 109 C 110 B

111 C 112 D 113 C 114 B 115 B

116 C 117 A 118 D 119 B 120 C

121 C 122 A 123 D 124 C 125 B

126 B 127 C 128 C 129 B 130 D

131 B 132 D 133 A 134 B 135 D

136 C 137 C 138 D 139 D 140 B

141 C 142 D 143 B 144 C 145 C

146 C 147 B 148 C 149 A 150 C

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