Cambridge A Level Chemistry 9701 — 2025 Oct/Nov Paper 1 · Variant 1

Question 1

2 The data in the table gives the 5th to the 10th ionisation energies of three elements from Period 3 of the Periodic Table. element ionisation energy/kJmol–1 5th 6th 7th 8th 9th 10th X 6274 21269 25398 29855 35868 40960 Y 7012 8496 27107 31671 36579 43140 Z 6542 9362 11018 33606 38601 43963 What are the correct identities of these three elements? element X element Y element Z A Na Mg Al B Mg Al Si C P S Cl D S Cl Ar

Accepted Answer

C

Question 2

3 What contains 9.03  1023 oxygen atoms? A 0.25mol aluminium oxide B 0.75mol sulfur dioxide C 1.5mol sulfur trioxide D 3.0mol water

Accepted Answer

B

Question 3

4 Methane and steam react to produce hydrogen. CH4(g)  +  2H2O(g)    CO2(g)  +  4H2(g) 0.80g of methane and 1.35g of steam react. One of the reactants is used up. Which volume of hydrogen, measured at room conditions, will be produced? A 1.80dm3 B 3.60dm3 C 4.80dm3 D 7.20dm3

Accepted Answer

B

Question 4

5 Which statement explains why sodium and potassium have different melting points? A The attraction between cations and delocalised electrons is stronger in sodium. B The attraction between cations and anions is stronger in sodium. C The attraction between atoms is stronger in sodium. D The attraction between nuclei and shared electron pairs is stronger in sodium.

Accepted Answer

A

Question 5

6 NH3 and HCN react together to form NH4CN, an ionic compound. Which row states the number of coordinate bonds and the number of  bonds in one formula unit of NH4CN? number of coordinate bonds number of  bonds A 0 2 B 1 2 C 0 3 D 1 3

Accepted Answer

B

Question 6

7 When 1.0mol of ethanoic acid, CH3COOH, in aqueous solution is neutralised by an excess of aqueous sodium hydroxide, 55kJmol–1 of energy is released. Which statement about this reaction is correct? A The reaction is exothermic because only bond breaking takes place. B The reaction is exothermic because only bond forming takes place. C The reaction is exothermic because more energy is given out in breaking bonds than is taken in to form bonds. D The reaction is exothermic because more energy is given out in forming bonds than is taken in to break bonds.

Accepted Answer

D

Question 7

8 In an experiment, 1.60g of a fuel is burnt. 45.0% of the energy released is absorbed by 200g of water. The temperature of the water rises from 18.0°C to 66.0°C. What is the total energy released per gram of fuel burnt? A 25100J B 55700J C 89200J D 143000J

Accepted Answer

B

Question 8

9 Sulfite ions, SO3 2–, react separately with zinc and with manganese dioxide. a, b, c, d, w, x, y and z are all whole numbers. aSO3 2–(aq)  +  bH2O(l)  +  Zn(s)    Zn2+(aq)  +  cOH–(aq)  +  dS2O4 2–(aq) MnO2(s)  +  wSO3 2–(aq)  +  xH+(aq)    Mn2+(aq)  +  yS2O6 2–(aq)  +  zH2O(l) Which numbers are correct for a, b, w and x? a b w x A 1 2 2 4 B 2 2 2 4 C 1 2 4 2 D 2 2 4 2

Accepted Answer

B

Question 9

10 Which equation shows hydrogen acting as an oxidising agent? A H2  +  2K    2K+H– B H2  +  I2  2HI C H2  +  Cu2S  +  ZnO    2Cu  +  ZnS  +  H2O D 3H2  +  N2  2NH3

Accepted Answer

A

Question 10

11 1.00g of nitrogen gas is stored in a 2.00dm3 vessel at 40.0°C. What is the pressure in the vessel? A 5940Pa B 11900Pa C 46400Pa D 92900Pa

Accepted Answer

C

Question 11

12 One molecule of haemoglobin, Hb, can bind with four molecules of oxygen according to the equation shown. Hb(aq)  +  4O2(aq) Hb(O2)4(aq) When the equilibrium concentration of O2 is 7.6  10–6 moldm–3, the equilibrium concentrations of Hb and Hb(O2)4 are equal. What is the numerical value of Kc  for this equilibrium? A 3.0  1020 B 1.3  105 C 7.6  10–6 D 3.3  10–21

Accepted Answer

A

Question 12

13 Aqueous acid P and aqueous alkali Q have the same concentration. 20cm3 of P is added to a conical flask. Q is slowly added to the flask and the volume of Q and the pH are recorded. The pH titration curve is shown. 0 14 12 10 8 6 4 2 0 2 4 6 8101214 volume of Q added/cm3 1618202224262830 pH Which row gives the identity of P and Q? P Q A HCl NaOH B H2SO4 NH3 C HCl Ba(OH)2 D CH3COOH Sr(OH)2

Accepted Answer

C

Question 13

14 Photochromic glass, used for sunglasses, darkens when exposed to bright light and becomes more transparent again when the light is less bright. The darkness of the glass is due to the presence of silver atoms. The following reactions are involved. reaction 1 Ag+  +  Cl– Ag  +  Cl reaction 2 Cu+  +  Cl  Cu2+  +  Cl– reaction 3 Cu2+  +  Ag    Cu+  +  Ag+ Which statement about these reactions is correct? A Cu+ and Cu2+ ions act as catalysts. B Cu+ ions act as an oxidising agent in reaction 2. C Reaction 3 increases the darkness of the glass. D Silver atoms are reduced in reaction 3.

Accepted Answer

A

Question 14

15 The reversible reaction between methanol and ethanoic acid liquids is catalysed by adding a small volume of concentrated sulfuric acid. Two statements about this reaction are listed. 1 The sulfuric acid is a homogeneous catalyst. 2 The sulfuric acid lowers the activation energy of the reverse reaction. Which statements are correct? A both 1 and 2 B 1 only C 2 only D neither 1 nor 2

Accepted Answer

A

Question 15

16 The atomic radii and ionic radii for three elements in Period 3 are shown. atomic radius/nm ionic radius/nm element X 0.118 0.053 element Y 0.099 0.180 element Z 0.160 0.072 Using this data, which statement is correct? A Element X has lower electrical conductivity than element Y. B Element Y has a higher melting point than element X. C Element Y and element Z react to form an ionic compound. D Element Z forms ionic compounds by gaining electrons.

Accepted Answer

C

Question 16

17 Three equations are listed. x, y and z are all whole numbers. 1 xAl  +  yO2zAl2O3 2 xMg  +  yO2zMgO 3 xNa  +  yO2zNa2O Which equations can be balanced if x = 4 and z = 2? A 1 and 3 B 1 only C 2 only D 3 only

Accepted Answer

A

Question 17

18 Which oxide has a simple structure rather than a giant structure? A MgO B Al2O3 C SiO2 D P4O10

Accepted Answer

D

Question 18

19 The trends seen in Group 2 can be used to predict the properties of radium and its compounds. Which statement is correct? A Radium has the highest second ionisation energy of the elements in Group 2. B Radium hydroxide is the least soluble of the hydroxides of the elements in Group 2. C Radium carbonate has the lowest thermal stability of the carbonates of the elements in Group 2. D Radium reacts faster with water than the other elements in Group 2.

Accepted Answer

D

Question 19

20 Equal masses of CaCO3, Ca(NO3)2, BaCO3 and Ba(NO3)2 are thermally decomposed. The volume of gas produced in each experiment is measured under the same conditions. Which compound will produce the greatest volume of gas? A CaCO3 B Ca(NO3)2 C BaCO3 D Ba(NO3)2

Accepted Answer

B

Question 20

21 Equation 1 and equation 2 show two different reactions of halide ion Q– with concentrated sulfuric acid. equation 1 H2SO4  +  Q–  HSO4 –  +  HQ equation 2 H2SO4  +  2Q–  +  2H+  SO2  +  Q2  +  2H2O What is Q? A Cl– or Br– B Br– or I– C Cl– only D I– only

Accepted Answer

B

Question 21

22 What happens when iodine solution is added to a solution of sodium bromide? A A reaction occurs without changes in oxidation state. B Bromide ions are oxidised; iodine atoms are reduced. C Bromide ions are reduced; iodine atoms are oxidised. D No reaction occurs.

Accepted Answer

D

Question 22

23 Which statement is correct? A Nitrogen is unreactive due to the absence of lone pairs in the molecule. B Aqueous ammonia contains both NH3(aq) and NH4 +(aq). The NH4 +(aq) ion is a Brønsted–Lowry acid. C High temperatures are needed to supply the energy to break the strong double bonds in nitrogen molecules when they react. D Atmospheric SO2 reacts with unburnt hydrocarbons to form a component of photochemical smog.

Accepted Answer

B

Question 23

24 When dry ammonia and hydrogen chloride gases are mixed, a solid white ionic compound is formed. Two statements are listed. 1 The formation of the ionic compound is a redox reaction. 2 During the formation of the ionic compound, the H–N–H bond angle increases. Which statements are correct? A both 1 and 2 B 1 only C 2 only D neither 1 nor 2

Accepted Answer

C

Question 24

25 The diagrams show skeletal formulas of some isomers of C6H12O. O 1 2 O O 3 4 O Which statement is correct? A 1 and 3 are chain isomers of each other and positional isomers of each other. B 2 and 3 are functional group isomers of each other and both have a chiral centre. C 1 and 4 are functional group isomers of each other and both have a chiral centre. D 2 and 4 are positional isomers of each other and functional group isomers of each other.

Accepted Answer

B

Question 25

26 The skeletal formulas of two compounds are shown. progesterone O O testosterone OH O Which statements about progesterone and testosterone are correct? A They both contain a ketone group, and they both have geometrical isomers due to the C=C bond. B They have the same molecular formula, and they both have geometrical isomers. C They have the same number of chiral carbons, and they have the same molecular formula. D They have the same number of chiral carbons, and they both contain a ketone group.

Accepted Answer

D

Question 26

27 Which intermediate ion forms in the greatest amount during the addition of HBr to propene? A CH3CH+CH3 B CH3CH2CH2 + C CH3CH–CH2Br D CH3CHBrCH2 –

Accepted Answer

A

Question 27

28 Two hydrocarbons, R–CH3 and R'–CH3, react separately with bromine in the presence of ultraviolet light. One of these hydrocarbons is unsaturated. In each case, free radical substitution reactions occur. R is CH3CHC(CH3). R' is CH3CH(CH3)CH2. Which row is correct? a propagation stage for the saturated hydrocarbon a termination stage for the unsaturated hydrocarbon A R–CH2•  +  Br•    R–CH2Br R'–CH2•  +  Br•    R'–CH2Br B R–CH2•  +  Br2  R–CH2Br  +  Br• R'–CH2•  +  Br2  R'–CH2Br  +  Br• C R'–CH3  +  Br•    R'–CH2•  +  HBr 2R–CH2•    R–CH2CH2–R D 2R'–CH2•    R'–CH2CH2–R' R–CH3  +  Br•    R–CH2•  +  HBr

Accepted Answer

C

Question 28

29 The fumes from the exhausts of petrol-burning cars contain the following pollutants. 1 unburnt hydrocarbons 2 nitrogen dioxide 3 carbon monoxide Which pollutants are removed by oxidation in a catalytic converter? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

C

Question 29

30 Compound X, C7H11ICl2, is dissolved in ethanol and the solution mixed with warm aqueous silver nitrate. A precipitate is seen immediately. CH2Cl Cl I compound X What is the colour of this precipitate and what is the structural formula of the first organic product? colour of the precipitate structural formula of the first organic product A cream CH2Cl HO OH B cream CH2OH HO OH C white CH2OH HO I D yellow CH2Cl Cl OH

Accepted Answer

D

Question 30

31 1,4-dibromobutane reacts with an excess of ethanolic sodium hydroxide until no further reaction takes place. What is the relative formula mass of the major organic product? A 54 B 56 C 74 D 90

Accepted Answer

A

Question 31

32 A small section of a polymer produced from two monomers is shown. –CH2–C(CH3)2–CH(CH3)–CH2– What are the two monomers? A but-1-ene and propene B but-2-ene and propene C ethene and pent-2-ene D methylpropene and propene

Accepted Answer

D

Question 32

33 The balanced equation for the reaction of X with an excess of acidified K2Cr2O7 is shown. X  +  3[O]    Y  +  H2O Compound Y is the only organic product of the reaction. Which compound is X? HO C H H C H A OH C OH H H HO C H H C H B H2C C OH OH H H O C H C H C CH CH3 C O H O O HO C H C H D C C O H H

Accepted Answer

A

Question 33

34 Three mixtures are heated under reflux. Which mixtures will produce sodium propanoate as one product? 1 CH3CH2CHO  +  NaBH4(aq) 2 CH3CH2CH2OH  +  Na(s) 3 CH3CH2CN  +  NaOH(aq) A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only

Accepted Answer

D

Question 34

35 Which compound is a product of the hydrolysis of CH3CO2CH2C2H5 using aqueous sodium hydroxide? A CH3CO2 –Na+ B CH3CO2H C C2H5CH2O–Na+ D C2H5CH2CO2 –Na+

Accepted Answer

A

Question 35

36 Compound Q reacts when heated with HCN in the presence of a catalyst to produce compound R. Molecules of compound R each contain four carbon atoms. What is compound Q? O B O OH A O H D Cl C

Accepted Answer

D

Question 36

37 The table shows the reagents and products of three reactions. reagents products 1 ethanoic acid + Na2CO3 CH3CO2Na  +  H2O  +  CO2 2 ethanoic acid + Mg (CH3CO2)2Mg  +  H2O 3 ethanoic acid + CH3OH CH3CO2CH3  +  H2O Which rows are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

C

Question 37

38 Seven aldehydes and ketones ● contain only one oxygen atom per molecule ● have four or fewer carbon atoms in their structures. Alkaline I2(aq) is added to each of these carbonyl compounds separately. How many of these carbonyl compounds produce a yellow precipitate with alkaline I2(aq)? A 1 B 2 C 3 D 4

Accepted Answer

C

Question 38

39 Some properties of compound X are listed. ● 1.0mol X reacts with exactly 8.5mol oxygen when completely combusted. ● X does not react when heated with acidified KMnO4. What are the possible identities of X? OH 1 2 HO 3 4 OH O A 1 and 3 B 2 and 4 C 3 only D 4 only

Accepted Answer

B

Question 39

40 A sample of magnesium contains the isotopes 24Mg, 25Mg and 26Mg only. The percentage abundance of 25Mg and 26Mg is the same. The relative atomic mass of magnesium in the sample is 24.3. What is the percentage abundance of 24Mg? A 10% B 20% C 60% D 80%

Accepted Answer

D

Question paper16 pages

Mark scheme3 pages

Questions as text

Q2 · The data in the table gives the 5th to the 10th ionisation energies of three elements…

Q3 · What contains 9.03  1023 oxygen atoms?

Q4 · Methane and steam react to produce hydrogen

Q5 · Which statement explains why sodium and potassium have different melting points?

Q6 · NH3 and HCN react together to form NH4CN, an ionic compound

Q7 · When 1.0mol of ethanoic acid, CH3COOH, in aqueous solution is neutralised by an excess of…

Q8 · In an experiment, 1.60g of a fuel is burnt

Q9 · Sulfite ions, SO3 2–, react separately with zinc and with manganese dioxide

Q10 · Which equation shows hydrogen acting as an oxidising agent?

Q11 · 1.00g of nitrogen gas is stored in a 2.00dm3 vessel at 40.0°C

Q12 · One molecule of haemoglobin, Hb, can bind with four molecules of oxygen according to the…

Q13 · Aqueous acid P and aqueous alkali Q have the same concentration

Q14 · Photochromic glass, used for sunglasses, darkens when exposed to bright light and becomes…

Q15 · The reversible reaction between methanol and ethanoic acid liquids is catalysed by adding…

Q16 · The atomic radii and ionic radii for three elements in Period 3 are shown

Q17 · Three equations are listed

Q18 · Which oxide has a simple structure rather than a giant structure?

Q19 · The trends seen in Group 2 can be used to predict the properties of radium and its…

Q20 · Equal masses of CaCO3, Ca(NO3)2, BaCO3 and Ba(NO3)2 are thermally decomposed

Q21 · Equation 1 and equation 2 show two different reactions of halide ion Q– with concentrated…

Q22 · What happens when iodine solution is added to a solution of sodium bromide?

Q23 · Which statement is correct?

Q24 · When dry ammonia and hydrogen chloride gases are mixed, a solid white ionic compound is…

Q25 · The diagrams show skeletal formulas of some isomers of C6H12O

Q26 · The skeletal formulas of two compounds are shown

Q27 · Which intermediate ion forms in the greatest amount during the addition of HBr to propene?

Q28 · Two hydrocarbons, R–CH3 and R'–CH3, react separately with bromine in the presence of…

Q29 · The fumes from the exhausts of petrol-burning cars contain the following pollutants

Q30 · Compound X, C7H11ICl2, is dissolved in ethanol and the solution mixed with warm aqueous…

Q31 · 1,4-dibromobutane reacts with an excess of ethanolic sodium hydroxide until no further…

Q32 · A small section of a polymer produced from two monomers is shown

Q33 · The balanced equation for the reaction of X with an excess of acidified K2Cr2O7 is shown

Q34 · Three mixtures are heated under reflux

Q35 · Which compound is a product of the hydrolysis of CH3CO2CH2C2H5 using aqueous sodium…

Q36 · Compound Q reacts when heated with HCN in the presence of a catalyst to produce compound R

Q37 · The table shows the reagents and products of three reactions

Q38 · Seven aldehydes and ketones ● contain only one oxygen atom per molecule ● have four or…

Q39 · Some properties of compound X are listed

Q40 · A sample of magnesium contains the isotopes 24Mg, 25Mg and 26Mg only

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