A Level Chemistry 9701 Paper 11, Oct/Nov 2025

What is the electronic configuration for the particle ${}_{13}^{27}{\text{Al}}^{+}$? A $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{1}3{\text{p}}^1$ B $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^2$ C $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{2}3{\text{p}}^2$ D $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{2}3{\text{p}}^{6}3{\text{d}}^{7}4{\text{s}}^1$

The data in the table gives the 5th to the 10th ionisation energies of three elements from Period 3 of the Periodic Table.

What are the correct identities of these three elements?

What contains $9.03\times {10}^{23}$ oxygen atoms? A $0.25\text{ mol}$ aluminium oxide B $0.75\text{ mol}$ sulfur dioxide C $1.5\text{ mol}$ sulfur trioxide D $3.0\text{ mol}$ water

Methane and steam react to produce hydrogen. $${\text{CH}}_4(\text{g})+2{\text{H}}_2\text{O}(\text{g})\to {\text{CO}}_2(\text{g})+4{\text{H}}_2(\text{g})$$ $0.80\text{ g}$ of methane and $1.35\text{ g}$ of steam react. One of the reactants is used up. Which volume of hydrogen, measured at room conditions, will be produced? A $1.80{\text{ dm}}^3$ B $3.60{\text{ dm}}^3$ C $4.80{\text{ dm}}^3$ D $7.20{\text{ dm}}^3$

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.

${\text{NH}}_3$ and $\text{HCN}$ react together to form ${\text{NH}}_4\text{CN}$, an ionic compound. Which row states the number of coordinate bonds and the number of $\pi$ bonds in one formula unit of ${\text{NH}}_4\text{CN}$?

When $1.0\text{ mol}$ of ethanoic acid, ${\text{CH}}_3\text{COOH}$, in aqueous solution is neutralised by an excess of aqueous sodium hydroxide, $55\text{ kJ}{\text{mol}}^{-1}$ 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.

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

Sulfite ions, ${\text{SO}}_3^{2-}$, react separately with zinc and with manganese dioxide. $a$, $b$, $c$, $d$, $w$, $x$, $y$ and $z$ are all whole numbers. $$a{\text{SO}}_3^{2-}(\text{aq})+b{\text{H}}_2\text{O}(\text{l})+\text{Zn}(\text{s})\to {\text{Zn}}^{2+}(\text{aq})+c{\text{OH}}^{-}(\text{aq})+d{\text{S}}_2{\text{O}}_4^{2-}(\text{aq})$$ $${\text{MnO}}_2(\text{s})+w{\text{SO}}_3^{2-}(\text{aq})+x{\text{H}}^{+}(\text{aq})\to {\text{Mn}}^{2+}(\text{aq})+y{\text{S}}_2{\text{O}}_6^{2-}(\text{aq})+z{\text{H}}_2\text{O}(\text{l})$$ Which numbers are correct for $a$, $b$, $w$ and $x$?

Which equation shows hydrogen acting as an oxidising agent? A ${\text{H}}_2+2\text{K}\to 2{\text{K}}^{+}{\text{H}}^{-}$ B ${\text{H}}_2+{\text{I}}_2\to 2\text{HI}$ C ${\text{H}}_2+{\text{Cu}}_2\text{S}+\text{ZnO}\to 2\text{Cu}+\text{ZnS}+{\text{H}}_2\text{O}$ D $3{\text{H}}_2+{\text{N}}_2\to 2{\text{NH}}_3$

$1.00\text{ g}$ of nitrogen gas is stored in a $2.00{\text{ dm}}^3$ vessel at $40.0{}^{\circ }\text{C}$. What is the pressure in the vessel? A $5940\text{ Pa}$ B $11900\text{ Pa}$ C $46400\text{ Pa}$ D $92900\text{ Pa}$

One molecule of haemoglobin, $\text{Hb}$, can bind with four molecules of oxygen according to the equation shown. $$\text{Hb}(\text{aq})+4{\text{O}}_2(\text{aq})\rightleftharpoons \text{Hb}({\text{O}}_2{)}_4(\text{aq})$$ When the equilibrium concentration of ${\text{O}}_2$ is $7.6\times {10}^{-6}\text{ mol}{\text{dm}}^{-3}$, the equilibrium concentrations of $\text{Hb}$ and $\text{Hb}({\text{O}}_2{)}_4$ are equal. What is the numerical value of $K_c$ for this equilibrium? A $3.0\times {10}^{20}$ B $1.3\times {10}^5$ C $7.6\times {10}^{-6}$ D $3.3\times {10}^{-21}$

Aqueous acid P and aqueous alkali Q have the same concentration. $20{\text{ cm}}^3$ 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. [pH titration curve showing initial pH around 1, equivalence point vertical region from pH 3 to pH 13 at volume of Q added = 10 cm³, final pH around 13–14] Which row gives the identity of P and Q?

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 ${\text{Ag}}^{+}+{\text{Cl}}^{-}\rightleftharpoons \text{Ag}+\text{Cl}$ reaction 2 ${\text{Cu}}^{+}+\text{Cl}\to {\text{Cu}}^{2+}+{\text{Cl}}^{-}$ reaction 3 ${\text{Cu}}^{2+}+\text{Ag}\to {\text{Cu}}^{+}+{\text{Ag}}^{+}$ Which statement about these reactions is correct? A ${\text{Cu}}^{+}$ and ${\text{Cu}}^{2+}$ ions act as catalysts. B ${\text{Cu}}^{+}$ 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.

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

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

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.

Three equations are listed. $x$, $y$ and $z$ are all whole numbers. 1 $x\text{Al}+y{\text{O}}_2\to z{\text{Al}}_2{\text{O}}_3$ 2 $x\text{Mg}+y{\text{O}}_2\to z\text{MgO}$ 3 $x\text{Na}+y{\text{O}}_2\to z{\text{Na}}_2\text{O}$ Which equations can be balanced if $x=4$ and $z=2$? A 1 and 3 B 1 only C 2 only D 3 only

Which oxide has a simple structure rather than a giant structure? A $\text{MgO}$ B ${\text{Al}}_2{\text{O}}_3$ C ${\text{SiO}}_2$ D ${\text{P}}_4{\text{O}}_{10}$

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.

Equal masses of ${\text{CaCO}}_3$, ${\text{Ca(NO}}_3{)}_2$, ${\text{BaCO}}_3$ and ${\text{Ba(NO}}_3{)}_2$ 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 ${\text{CaCO}}_3$ B ${\text{Ca(NO}}_3{)}_2$ C ${\text{BaCO}}_3$ D ${\text{Ba(NO}}_3{)}_2$

Equation 1 and equation 2 show two different reactions of halide ion ${\text{Q}}^{-}$ with concentrated sulfuric acid. equation 1 ${\text{H}}_2{\text{SO}}_4+{\text{Q}}^{-}\to {\text{HSO}}_4^{-}+\text{HQ}$ equation 2 ${\text{H}}_2{\text{SO}}_4+2{\text{Q}}^{-}+2{\text{H}}^{+}\to {\text{SO}}_2+{\text{Q}}_2+2{\text{H}}_2\text{O}$ What is Q? A ${\text{Cl}}^{-}$ or ${\text{Br}}^{-}$ B ${\text{Br}}^{-}$ or ${\text{I}}^{-}$ C ${\text{Cl}}^{-}$ only D ${\text{I}}^{-}$ only

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.

Which statement is correct? A Nitrogen is unreactive due to the absence of lone pairs in the molecule. B Aqueous ammonia contains both ${\text{NH}}_3(\text{aq})$ and ${\text{NH}}_4^{+}(\text{aq})$. The ${\text{NH}}_4^{+}(\text{aq})$ 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 ${\text{SO}}_2$ reacts with unburnt hydrocarbons to form a component of photochemical smog.

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

The diagrams show skeletal formulas of some isomers of ${\text{C}}_6{\text{H}}_{12}\text{O}$. 1: hexanal 2: 3-methylpentan-2-one 3: 2-ethylbutanal 4: hexan-3-one 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.

The skeletal formulas of two compounds are shown. progesterone and testosterone 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.

Which intermediate ion forms in the greatest amount during the addition of $\text{HBr}$ to propene? A ${\text{CH}}_3{\text{CH}}^{+}{\text{CH}}_3$ B ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2^{+}$ C ${\text{CH}}_3{\text{CH}}^{-}{\text{CH}}_2\text{Br}$ D ${\text{CH}}_3{\text{CHBrCH}}_2^{-}$

Two hydrocarbons, ${\text{R–CH}}_3$ and ${\text{R’–CH}}_3$, react separately with bromine in the presence of ultraviolet light. One of these hydrocarbons is unsaturated. In each case, free radical substitution reactions occur. $\text{R}$ is ${\text{CH}}_3{\text{CHC(CH}}_3)$. $\text{R’}$ is ${\text{CH}}_3{\text{CH(CH}}_3){\text{CH}}_2$. Which row is correct?

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

Compound X, ${\text{C}}_7{\text{H}}_{11}{\text{ICl}}_2$, is dissolved in ethanol and the solution mixed with warm aqueous silver nitrate. A precipitate is seen immediately. [Structure of compound X: cyclohexane ring with $-{\text{CH}}_2\text{Cl}$ at position 1, $-\text{Cl}$ at position 2, and $-\text{I}$ at position 4] What is the colour of this precipitate and what is the structural formula of the first organic product?

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

A small section of a polymer produced from two monomers is shown. $${\text{–CH}}_2{\text{–C(CH}}_3{)}_2{\text{–CH(CH}}_3){\text{–CH}}_2\text{–}$$ 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

The balanced equation for the reaction of X with an excess of acidified ${\text{K}}_2{\text{Cr}}_2{\text{O}}_7$ is shown. $$\text{X}+3[\text{O}]\to \text{Y}+{\text{H}}_2\text{O}$$ Compound Y is the only organic product of the reaction. Which compound is X? A $\text{O}=\text{C(OH)}-{\text{CH}}_2-\text{CH(OH)}-{\text{CH}}_3$ B $\text{HO}-{\text{CH}}_2-{\text{CH}}_2-{\text{C(CH}}_2\text{OH})(\text{OH})-\text{H}$ C $\text{HO}-{\text{CH}}_2-\text{CH(OH)}-{\text{CH}}_2\text{OH}$ D $\text{O}=\text{C(H)}-{\text{CH}}_2-\text{CH(CH=O)}-\text{CH=O}$

Three mixtures are heated under reflux. Which mixtures will produce sodium propanoate as one product? 1 ${\text{CH}}_3{\text{CH}}_2\text{CHO}+{\text{NaBH}}_4(\text{aq})$ 2 ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{OH}+\text{Na}(\text{s})$ 3 ${\text{CH}}_3{\text{CH}}_2\text{CN}+\text{NaOH}(\text{aq})$ A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only

Which compound is a product of the hydrolysis of ${\text{CH}}_3{\text{CO}}_2{\text{CH}}_2{\text{C}}_2{\text{H}}_5$ using aqueous sodium hydroxide? A ${\text{CH}}_3{\text{CO}}_2^{-}{\text{Na}}^{+}$ B ${\text{CH}}_3{\text{CO}}_2\text{H}$ C ${\text{C}}_2{\text{H}}_5{\text{CH}}_2{\text{O}}^{-}{\text{Na}}^{+}$ D ${\text{C}}_2{\text{H}}_5{\text{CH}}_2{\text{CO}}_2^{-}{\text{Na}}^{+}$

Compound Q reacts when heated with $\text{HCN}$ in the presence of a catalyst to produce compound R. Molecules of compound R each contain four carbon atoms. What is compound Q? A propanoic acid, ${\text{CH}}_3{\text{CH}}_2\text{COOH}$ B propan-2-one, ${\text{CH}}_3{\text{COCH}}_3$ C 1-chloropropane, ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{Cl}$ D propanal, ${\text{CH}}_3{\text{CH}}_2\text{CHO}$

The table shows the reagents and products of three reactions.

Which rows are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Seven aldehydes and ketones ● contain only one oxygen atom per molecule ● have four or fewer carbon atoms in their structures. Alkaline ${\text{I}}_2(\text{aq})$ is added to each of these carbonyl compounds separately. How many of these carbonyl compounds produce a yellow precipitate with alkaline ${\text{I}}_2(\text{aq})$? A 1 B 2 C 3 D 4

Some properties of compound X are listed. ● $1.0\text{ mol}$ X reacts with exactly $8.5\text{ mol}$ oxygen when completely combusted. ● X does not react when heated with acidified ${\text{KMnO}}_4$. What are the possible identities of X? 1: 3,3-dimethylbutan-1-ol 2: 1-methylcyclopentanol 3: 2,2-dimethylbutan-1-ol 4: hexan-3-one Which are the possible identities of X? A 1 and 3 B 2 and 4 C 3 only D 4 only

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