Chemistry 0620/22 February/March 2022: question paper and mark scheme

Question

Which gas has the fastest rate of diffusion? A H2 B CH4 C CO2 D SO2

Question

In which state does 1 dm3 of methane contain the most particles? A gas at 100 °C B gas at room temperature C liquid D solid

Question

Which statement explains why isotopes of the same element have the same chemical properties? A They have the same electronic structure. B They have the same relative mass. C They have the same nucleon number. D They have the same proton number.

Question

The electronic structures of atoms P and Q are shown. P Q P and Q form an ionic compound. What is the formula of the compound? A PQ B P2Q C P2Q3 D PQ2

Question

Fermentation of sugar produces a mixture of ethanol solution and solid yeast. How is the solid yeast removed from the mixture? A crystallisation B distillation C filtration D fractional distillation

Question

Which row explains why copper is a good conductor of electricity at room temperature? copper ions electrons move freely move freely A no no B no yes C yes no D yes yes

Question

Which pair of statements about diamond and graphite is correct? diamond graphite A Diamond and graphite are both pure carbon. They are both macromolecules. B Diamond and graphite can both be used as electrodes. Graphite is also used as a lubricant. C Diamond has covalent bonds. Graphite has ionic bonds. D Diamond is hard with a high melting point. Graphite is soft with a low melting point.

Question

Sodium nitride contains the nitride ion, N3–. Sodium nitride is unstable and decomposes into its elements. What is the equation for the decomposition of sodium nitride? A 2NaN3 → 2Na + 3N2 B 2Na3N → 6Na + N2 C 2NaN3 → Na2 + 3N2 D 2Na3N → 6Na + 2N

Question

Compound X contains carbon, hydrogen and oxygen only. By mass, it contains 26.7% carbon and 2.2% hydrogen. What is the empirical formula of X? A CHO B C2HO C CH2O D CHO2

Question

Caesium fluoride is an ionic compound. Which statements about caesium fluoride are correct? 1 It conducts electricity when solid. 2 It has a high melting point. 3 It is soluble in water. 4 It is highly volatile. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Which diagram shows the direction of movement of ions and electrons during the electrolysis of molten sodium chloride? A B power power supply supply cathode anode cathode anode e– e– – Na+ e Na+ e– Cl – Cl – C D power power supply supply anode cathode anode cathode – – e e – Na+ e Na+ e– Cl – Cl –

Question

Calcium carbonate, CaCO3, reacts with dilute hydrochloric acid to produce carbon dioxide. The equation for the reaction is shown. The relative formula mass of calcium carbonate is 100. CaCO3 + 2HCl → CaCl 2 + H2O + CO2 10 g of calcium carbonate is reacted with an excess of dilute hydrochloric acid. Which mass of carbon dioxide is produced? A 2.2 g B 2.8 g C 4.4 g D 44 g

Question

Molten sodium chloride and concentrated aqueous sodium chloride are electrolysed using platinum electrodes. What are the products at the negative electrode (cathode) in each electrolysis? molten concentrated aqueous sodium chloride sodium chloride A hydrogen hydrogen B hydrogen sodium C sodium hydrogen D sodium sodium

Question

An object is electroplated with silver using an aqueous silver salt as the electrolyte. Which row is correct? the object to be the other electrode electroplated is the is made from A anode carbon B anode silver C cathode carbon D cathode silver

Question

Which row describes the changes that occur in an endothermic reaction? energy change temperature A energy given out to decreases the surroundings B energy given out to increases the surroundings C energy taken in from decreases the surroundings D energy taken in from increases the surroundings

Question

Which statement about fuels is correct? A Heat energy is only produced by burning fuels. B Hydrogen is used as a fuel although it is difficult to store. C Methane is a good fuel because it produces only water when burned. D Uranium is burned in air to produce energy.

Question

Which statement about endothermic and exothermic reactions is correct? A In an endothermic reaction, less energy is absorbed in bond breaking than is released in bond forming. B In an endothermic reaction, the activation energy is always higher than in an exothermic reaction. C In an exothermic reaction, more energy is absorbed in bond breaking than is released in bond forming. D In an exothermic reaction, the reactants are higher on an energy level diagram than the products.

Question

The reaction used to manufacture ammonia from nitrogen and hydrogen is reversible. An equilibrium is established between ammonia, nitrogen and hydrogen. Which statement describes the equilibrium? A Both the forward reaction and the backward reaction have the same rate. B The rate of the backward reaction is greater than the rate of the forward reaction. C The rate of the forward reaction is greater than the rate of the backward reaction. D The forward and backward reactions have both stopped.

Question

How does increasing the concentration affect the reacting particles in a chemical reaction? increases the proportion increases the of particles with the collision rate activation energy A B C D

Question

Methyl orange is added to dilute hydrochloric acid and to aqueous sodium hydroxide. What is the colour of the methyl orange in each solution? colour in dilute colour in aqueous hydrochloric acid sodium hydroxide A orange red B red yellow C red orange D yellow red

Question

Zinc oxide is an amphoteric oxide. Which types of substances will react with zinc oxide? A acids and bases B acids only C bases only D neither acids nor bases

Question

Information about some silver compounds is shown. compound formula solubility in water silver carbonate Ag2CO3 insoluble silver chloride AgCl insoluble silver nitrate AgNO3 soluble silver oxide Ag2O insoluble Which equation shows a reaction which cannot be used to make a silver salt? A AgNO3(aq) + HCl (aq) → AgCl (s) + HNO3(aq) B Ag2O(s) + 2HNO3(aq) → 2AgNO3(aq) + H2O(l) C Ag2CO3(s) + 2HNO3(aq) → 2AgNO3(aq) + H2O(l) + CO2(g) D 2Ag(s) + 2HCl (aq) → 2AgCl (s) + H2(g)

Question

Aqueous ethanoic acid is a weak acid. Aqueous sodium hydroxide is a strong base. Aqueous ethanoic acid is neutralised by aqueous sodium hydroxide. Which statements are correct? 1 Aqueous ethanoic acid accepts protons from hydroxide ions. 2 The aqueous ethanoic acid used is fully dissociated into ions. 3 The aqueous sodium hydroxide used is fully dissociated into ions. 4 The reaction produces a salt and water. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Three properties of element X are listed. ● It contains atoms with a full outer shell of electrons. ● It is monoatomic. ● It is unreactive. In which part of the Periodic Table is the element placed? A Group I B Group VII C Group VIII D transition elements

Question

Which word equation represents a reaction that occurs? A sodium oxide + carbon → sodium + carbon dioxide B sodium oxide + iron → sodium + iron(II) oxide C iron(II) oxide + copper → iron + copper(II) oxide D iron(III) oxide + carbon → iron + carbon dioxide

Question

Which statement about the extraction of aluminium is correct? A Aluminium is formed at the cathode during the electrolysis of aluminium oxide. B Hematite is mainly aluminium oxide. C Molten cryolite is used to raise the melting point of the aluminium oxide. D Oxygen gains electrons at the anode during the electrolysis of aluminium oxide.

Question

Metal M is mixed with copper to produce brass. What is M? A chromium B nickel C vanadium D zinc

Question

The table gives some properties of an element. melting point in °C 3422 appearance of the element grey appearance of the chloride of the element dark blue density in g / cm3 19.2 electrical conductivity when solid good Which other property does this element have? A acts as a catalyst B brittle C forms an acidic oxide D highly reactive with water

Question

Ammonia is produced using the Haber process. Which row shows the source of the raw materials and the reaction conditions? source of source of temperature pressure nitrogen hydrogen / °C / atm A air hydrocarbons 200 200 B hydrocarbons air 450 2 C air hydrocarbons 450 200 D air hydrocarbons 450 2

Question

How many species are acting as bases in this reversible reaction? HNO3 + H2O H3O+ + NO3– A 3 B 2 C 1 D 0

Question

The equation for a reaction occurring in the Contact process is shown. 2SO2 + O2 → 2SO3 What is the catalyst used in this reaction? A iron B phosphoric(V) acid C sulfuric acid D vanadium(V) oxide

Question

Which information about carbon dioxide and methane is correct? carbon dioxide methane A formed when vegetation decomposes key B greenhouse gas = correct C present in unpolluted air = not correct D produced during respiration

Question

The structure of an ester is shown. H O H C C H H H H O C C C H H H H What are the names of the carboxylic acid and the alcohol that react together to form this ester? carboxylic acid alcohol A ethanoic acid ethanol B ethanoic acid propan-1-ol C propanoic acid ethanol D propanoic acid propan-1-ol

Question

Which statements about lime are correct? 1 Lime is made by heating calcium carbonate (limestone). 2 Lime is used to desulfurise flue gases. 3 Lime is used to treat alkaline soil. 4 The chemical name for lime is calcium oxide. A 1 and 3 B 1, 2 and 4 C 1 and 4 only D 2, 3 and 4

Question

Which structure is correctly named? A B C D H H H H H H H H H C C C O H H C C H H C C O H C C C H H H O H H H H H H H ethanoic acid ethene ethanol propane

Question

The structure of part of a polymer is shown. Cl H Cl H Cl C C C C C H CH3 H CH3 H Which monomers can be used to make this polymer? 1 2 3 4 Cl CH3 Cl H CH3 H Cl CH3 C C C C C C C C H H H CH3 Cl H H Cl A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Carboxylic acids are made by the oxidation of alcohols. Which carboxylic acid is produced from CH3CH2OH? A butanoic acid B ethanoic acid C methanoic acid D propanoic acid

Question

Propene, C3H6, reacts with bromine, Br2, in an addition reaction. Which structure represents the product of this reaction? A B C D H H H H Br H H H H H H H H C C C H H C C C H H C C C H Br C C C Br Br H H H Br H Br Br H H H H

Question

Which statements about ethanol are correct? 1 Ethanol is used as a solvent. 2 Ethanol can be made directly from ethane. 3 Ethanol is a covalent compound. A 1 only B 1 and 2 C 1 and 3 D 2 and 3

Question

Which diagram represents the structure of nylon? O O A C O O C O O B C N C H O O C C N N C H H O O D C O N C H The Periodic Table of Elements Group I II III IV V VI VII VIII 1 2 H He hydrogen helium Key 1 4 3 4 atomic number 5 6 7 8 9 10 Li Be atomic symbol B C N O F Ne lithium beryllium name boron carbon nitrogen oxygen fluorine neon 7 9 relative atomic mass 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar sodium magnesium aluminium silicon phosphorus sulfur chlorine argon 23 24 27 28 31 32 35.5 40 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr potassium calcium scandium titanium vanadium chromium manganese iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine krypton 39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe rubidium strontium yttrium zirconium niobium molybdenum technetium ruthenium rhodium palladium silver cadmium indium tin antimony tellurium iodine xenon 85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131 16 55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 lanthanoids Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn caesium barium hafnium tantalum tungsten rhenium osmium iridium platinum gold mercury thallium lead bismuth polonium astatine radon 133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – – 87 88 89–103 104 105 106 107 108 109 110 111 112 114 116 actinoids Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Fl Lv francium radium rutherfordium dubnium seaborgium bohrium hassium meitnerium darmstadtium roentgenium copernicium flerovium livermorium – – – – – – – – – – – – – 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 lanthanoids La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu lanthanum cerium praseodymium neodymium promethium samarium europium gadolinium terbium dysprosium holmium erbium thulium ytterbium lutetium 139 140 141 144 – 150 152 157 159 163 165 167 169 173 175 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 actinoids Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr actinium thorium protactinium uranium neptunium plutonium americium curium berkelium californium einsteinium fermium mendelevium nobelium lawrencium – 232 231 238 – – – – – – – – – – – The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.).