A Level Chemistry 9701 Paper 13, May/June 2024

X is an impure sample of a Group 2 metal carbonate, $\mathrm{M}\mathrm{C}{\mathrm{O}}_3$. X contains 57% by mass of $\mathrm{M}\mathrm{C}{\mathrm{O}}_3$. The impurities in X do not react with hydrochloric acid. $7.4\text{ g}$ of X is reacted with an excess of dilute hydrochloric acid. $0.050\text{ mol}$ of the Group 2 metal chloride is produced. What is the identity of the Group 2 metal? A Mg B Ca C Sr D Ba

Which of these samples of gas contains the same number of atoms as $1\text{ g}$ of hydrogen gas? A $22\text{ g}$ of carbon dioxide ($M_{\text{r}}$: $\mathrm{C}{\mathrm{O}}_2$, 44) B $8\text{ g}$ of methane ($M_{\text{r}}$: $\mathrm{C}{\mathrm{H}}_4$, 16) C $20\text{ g}$ of neon ($M_{\text{r}}$: $\mathrm{N}\mathrm{e}$, 20) D $8\text{ g}$ of ozone ($M_{\text{r}}$: ${\mathrm{O}}_3$, 48)

What is the total number of protons, neutrons and electrons present in an ammonium ion with a relative formula mass of 21?

This question is about the first ionisation energies of magnesium and neon. Which row is correct?

Arsenic forms a compound with fluorine. In this compound, the arsenic atom has no lone pair of electrons and there are no dative bonds. Selenium also forms a compound with fluorine. In this compound, the selenium atom has no lone pair of electrons and there are no dative bonds. In which compounds are there two different bond angles? (In this question, ${180}^{\circ }$ bond angles should be ignored.) A both arsenic fluoride and selenium fluoride B arsenic fluoride only C selenium fluoride only D neither arsenic fluoride nor selenium fluoride

A structure for borazole, ${\mathrm{N}}_3{\mathrm{B}}_3{\mathrm{H}}_6$, is shown. Which shape is borazole and how many $\pi$ electrons are there in the structure?

The diagram shows the apparatus used to find the relative molecular mass of a volatile liquid. When $0.10\text{ g}$ of a volatile liquid is injected into the syringe, all of the volatile liquid evaporates and the volume increases by $85{\text{ cm}}^3$. The heater maintains a temperature of $400\text{ K}$ and the experiment is carried out at a pressure of $101300\text{ Pa}$. If the vapour of the volatile liquid behaves as an ideal gas, which expression can be used to calculate the relative molecular mass of the liquid? A $M_{\text{r}}=(85\times 101300)÷(0.10\times 8.31\times 400)$ B $M_{\text{r}}=(85\times 101.3)÷(0.10\times 8.31\times 400)$ C $M_{\text{r}}=(0.10\times 8.31\times 400)÷(85\times {10}^{-6}\times 101300)$ D $M_{\text{r}}=(0.10\times 8.31\times 400)÷(85\times {10}^{-6}\times 101.3)$

The table shows physical properties of four substances, W, X, Y and Z.

What are the identities of W, X, Y and Z?

The apparatus used to determine a value for the enthalpy of combustion of butan-1-ol is shown. The mass of $1.00{\text{ cm}}^3$ of water is $1.00\text{ g}$.

butan-1-ol $M_{\text{r}}=74$ Which value, to three significant figures, for the enthalpy of combustion of butan-1-ol can be calculated from these data? A $-114{\text{ J mol}}^{-1}$ B $-17.2{\text{ kJ mol}}^{-1}$ C $-2600{\text{ kJ mol}}^{-1}$ D $-4540{\text{ kJ mol}}^{-1}$

In the high temperatures of car engines, nitrogen reacts with oxygen to produce nitrogen monoxide. $$\frac{1}{2}{\mathrm{N}}_2(\mathrm{g})+\frac{1}{2}{\mathrm{O}}_2(\mathrm{g})\to \mathrm{N}\mathrm{O}(\mathrm{g})\mathrm{\Delta }{H}^{\ominus }=+90{\text{ kJ mol}}^{-1}$$ This reaction has activation energy $E_{\text{a}}$. Which reaction pathway diagram correctly represents this reaction?

In which reaction does the oxidation number of chlorine change by the largest amount? A $2\mathrm{K}\mathrm{C}\mathrm{l}{\mathrm{O}}_3\to 2\mathrm{K}\mathrm{C}\mathrm{l}+3{\mathrm{O}}_2$ B $2\mathrm{C}\mathrm{l}{\mathrm{O}}^{-}\to \mathrm{C}{\mathrm{l}}^{-}+\mathrm{C}\mathrm{l}{\mathrm{O}}_2^{-}$ C $\mathrm{C}{\mathrm{l}}_2+{\mathrm{H}}_2\mathrm{O}\to \mathrm{H}\mathrm{C}\mathrm{l}+\mathrm{H}\mathrm{C}\mathrm{l}\mathrm{O}$ D $2\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}{\mathrm{O}}_2+\mathrm{C}{\mathrm{l}}_2\to 2\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}+2\mathrm{C}\mathrm{l}{\mathrm{O}}_2$

Hydrogen is produced industrially from methane as shown in the equation. $$\mathrm{C}{\mathrm{H}}_4(\mathrm{g})+{\mathrm{H}}_2\mathrm{O}(\mathrm{g})\rightleftharpoons \mathrm{C}\mathrm{O}(\mathrm{g})+3{\mathrm{H}}_2(\mathrm{g})\mathrm{\Delta }{H}^{\ominus }=+205{\text{ kJ mol}}^{-1}$$ Which conditions give the highest yield of hydrogen at equilibrium?

W moles of $\mathrm{H}\mathrm{N}{\mathrm{O}}_2$ undergoes a disproportionation reaction to produce U moles of $\mathrm{H}\mathrm{N}{\mathrm{O}}_3$ and V moles of $\mathrm{N}\mathrm{O}$. ● No other nitrogen containing product is produced. ● Nitrogen is the only element oxidised or reduced. What are the values of W, U and V?

Gas X dissociates on heating to set up the following equilibrium. $$\mathrm{X}(\mathrm{g})\rightleftharpoons \mathrm{Y}(\mathrm{g})+\mathrm{Z}(\mathrm{g})$$ A quantity of gas X is heated at constant pressure, $p$, at a certain temperature. The equilibrium partial pressure of gas X is found to be $\frac{1}{7}p$. What is the equilibrium constant, $K_p$, at this temperature? A $\frac{6}{7}p$ B $\frac{9}{7}p$ C $\frac{36}{7}p$ D $9p$

In the diagram, X is the Boltzmann distribution for the energies of the particles in a reaction and $E_{\text{A}1}$ is the activation energy for that reaction. Which statement is correct? A $E_{\text{A}2}$ is the activation energy at a higher temperature. B $E_{\text{A}2}$ is the activation energy at a lower temperature. C Y is the Boltzmann distribution at a lower temperature. D Z is the Boltzmann distribution at a higher temperature.

Magnesium, aluminium and silicon are elements in the Periodic Table. Each element forms an oxide. Which row is correct?

Which statement correctly describes what happens when silicon tetrachloride is added to water? A The $\mathrm{S}\mathrm{i}\mathrm{C}{\mathrm{l}}_4$ dissolves to give a neutral solution only. B The $\mathrm{S}\mathrm{i}\mathrm{C}{\mathrm{l}}_4$ reacts to give an acidic solution only. C The $\mathrm{S}\mathrm{i}\mathrm{C}{\mathrm{l}}_4$ reacts to give a precipitate and an acidic solution. D The $\mathrm{S}\mathrm{i}\mathrm{C}{\mathrm{l}}_4$ reacts to give a precipitate and a neutral solution.

X and Y are two elements from Period 3 of the Periodic Table. Element X has a higher electrical conductivity than element Y. Element Y has a higher melting point than element X. Which formula is a compound formed from element X and element Y? A $\mathrm{M}\mathrm{g}\mathrm{S}$ B $\mathrm{M}{\mathrm{g}}_2\mathrm{S}\mathrm{i}$ C $\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}$ D $\mathrm{S}\mathrm{i}\mathrm{C}{\mathrm{l}}_4$

A sample consisting of $1.0\text{ mol}$ of anhydrous calcium nitrate is completely decomposed by strong heating. What is the total amount of gas produced in this reaction? A $1.0\text{ mol}$ B $2.0\text{ mol}$ C $2.5\text{ mol}$ D $3.0\text{ mol}$

Steam is passed over heated magnesium to give compound J and hydrogen. What is not a property of compound J? A It has an $M_{\text{r}}$ of 40.3. B It is basic. C It is a white solid. D It is very soluble in water.

Which statement is correct? A Hydrogen bromide reduces concentrated sulfuric acid to form sulfur dioxide gas. B Hydrogen bromide decomposes at a higher temperature than hydrogen chloride. C When hydrogen bromide gas is shaken with aqueous silver nitrate a yellow precipitate is formed. D When hydrogen bromide gas is bubbled through aqueous iodine the solution becomes colourless.

$\mathrm{I}\mathrm{C}\mathrm{l}$ is made when $\mathrm{C}{\mathrm{l}}_2$ and ${\mathrm{I}}_2$ react together. $$\mathrm{C}{\mathrm{l}}_2+{\mathrm{I}}_2\rightleftharpoons 2\mathrm{I}\mathrm{C}\mathrm{l}$$ $\mathrm{I}\mathrm{C}\mathrm{l}$ reacts with water. $$5\mathrm{I}\mathrm{C}\mathrm{l}+3{\mathrm{H}}_2\mathrm{O}\to 5\mathrm{H}\mathrm{C}\mathrm{l}+\mathrm{H}\mathrm{I}{\mathrm{O}}_3+2{\mathrm{I}}_2$$ Which row is correct?

$\mathrm{N}{\mathrm{H}}_4\mathrm{C}\mathrm{l}$ reacts with $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ in an aqueous solution. Which statement is correct? A The reaction gives rise to two different polar product molecules. B The bond angle in the nitrogen-containing species remains unchanged. C The ammonium ion acts as a base. D The oxidation state of nitrogen increases in the reaction.

What is produced when $60\text{ g}$ of nitrogen monoxide reacts with an excess of carbon monoxide in a catalytic converter? A $12\text{ g}$ of carbon and $92\text{ g}$ of nitrogen dioxide B $24\text{ g}$ of carbon and $92\text{ g}$ of nitrogen dioxide C $88\text{ g}$ of carbon dioxide and $28\text{ g}$ of nitrogen D $88\text{ g}$ of carbon dioxide and $56\text{ g}$ of nitrogen

Which alkene shows geometric isomerism? A $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{H}=\mathrm{C}{\mathrm{H}}_2$ B $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{C}{\mathrm{H}}_3$ C $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}(\mathrm{C}{\mathrm{H}}_3)=\mathrm{C}{\mathrm{H}}_2$ D $\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{H}=\mathrm{C}(\mathrm{C}{\mathrm{H}}_3{)}_2$

What is the correct name of the major product of the reaction of $\mathrm{H}\mathrm{B}\mathrm{r}$ with 3-ethylhex-3-ene? A 3-bromo-3-ethylhexane B 3-bromo-4-ethylhexane C 4-bromo-3-ethylhexane D 4-bromo-4-ethylhexane

The alkane $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{H}(\mathrm{C}{\mathrm{H}}_3{)}_2$ undergoes free radical substitution with chlorine. No C–C bonds are broken in this reaction. How many isomeric products, including positional and optical isomers, of molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{11}\mathrm{C}\mathrm{l}$ can be formed? A 4 B 5 C 6 D 7

What is involved in the mechanism of the reaction between aqueous $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ and 1-bromobutane? A attack by a nucleophile on a carbon atom with a partial positive charge B heterolytic bond fission and attack by a nucleophile on a carbocation C homolytic bond fission and attack by an electrophile on a carbanion D homolytic bond fission and attack by a nucleophile on a carbocation

But-2-ene reacts with cold dilute acidified $\mathrm{K}\mathrm{M}\mathrm{n}{\mathrm{O}}_4$ to give product X. But-2-ene reacts with an excess of hot concentrated acidified $\mathrm{K}\mathrm{M}\mathrm{n}{\mathrm{O}}_4$ to give product Y. Which statement about X and Y is correct? A Only one of X and Y reacts with 2,4-dinitrophenylhydrazine. B X and Y both react with sodium hydroxide. C X and Y both react with sodium metal. D Y reacts with $\mathrm{L}\mathrm{i}\mathrm{A}\mathrm{l}{\mathrm{H}}_4$ to give X.

When heated with $\mathrm{K}\mathrm{O}\mathrm{H}$ dissolved in ethanol, halogenoalkanes can undergo an elimination reaction to form alkenes. What are the possible elimination products when 2-bromobutane is heated with $\mathrm{K}\mathrm{O}\mathrm{H}$ dissolved in ethanol? A $\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{C}{\mathrm{H}}_3$ only B $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{H}=\mathrm{C}{\mathrm{H}}_2$ only C $\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{C}{\mathrm{H}}_3$ and $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{H}=\mathrm{C}{\mathrm{H}}_2$ D $\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{C}{\mathrm{H}}_3$ and $\mathrm{C}{\mathrm{H}}_2=\mathrm{C}\mathrm{H}\mathrm{C}\mathrm{H}=\mathrm{C}{\mathrm{H}}_2$

Chloroethane can be used to make sodium propanoate. $$\text{chloroethane}\to \text{intermediate Q}\to \text{sodium propanoate}$$ Intermediate Q is hydrolysed with boiling aqueous $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ to give sodium propanoate. Which reagent would produce intermediate Q from chloroethane? A concentrated ammonia solution B dilute sulfuric acid C hydrogen cyanide in water D potassium cyanide in ethanol

Four different alcohols are treated with alkaline ${\mathrm{I}}_2(\mathrm{a}\mathrm{q})$. Which row is correct?

The $M_{\text{r}}$ of compound X is 88. Compound X is heated under reflux with an excess of acidified potassium dichromate(VI) to produce compound Y. Compound Y reacts with compound X under suitable conditions to produce compound Z. The $M_{\text{r}}$ of compound Z is 172. What is compound X? A $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{H}\mathrm{O}\mathrm{H}\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$ B $(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{C}\mathrm{O}\mathrm{H}\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$ C $(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{C}\mathrm{H}\mathrm{C}\mathrm{H}\mathrm{O}\mathrm{H}\mathrm{C}{\mathrm{H}}_3$ D $(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{C}\mathrm{C}{\mathrm{H}}_2\mathrm{O}\mathrm{H}$

Butanedione, $\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{O}\mathrm{C}\mathrm{O}\mathrm{C}{\mathrm{H}}_3$, is a yellow liquid. How does butanedione react with 2,4-dinitrophenylhydrazine reagent and Fehling’s reagent?

Which substance reacts with ethanoic acid to give the organic product with the highest $M_{\text{r}}$? A lithium aluminium hydride B magnesium C potassium carbonate D propan-2-ol

A sample of propyl ethanoate is hydrolysed by heating under reflux with aqueous $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$. The two organic products of the hydrolysis are separated, purified and weighed. Out of the total mass of products obtained, what is the percentage by mass of each product? A 32.4% and 67.6% B 38.3% and 61.7% C 42.3% and 57.7% D 50.0% and 50.0%

Which statement about PVC is correct? A Combustion products of PVC are very alkaline and harmful to breathe in. B The empirical formula of PVC is the same as the empirical formula of the monomer. C Molecules of PVC are unsaturated. D The repeat unit of PVC is $(\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{C}{\mathrm{l}}_2)$.

Compound Q reacts separately with $\mathrm{H}\mathrm{C}\mathrm{N}$ and $\mathrm{N}\mathrm{a}\mathrm{B}{\mathrm{H}}_4$ under suitable conditions. Both reactions produce an organic product with a chiral centre. What is compound Q? A butanone B ethanal C propanal D propanone

Compound X has the following properties. ● When $0.20\text{ mol}$ of X undergoes complete combustion, $14.4{\text{ dm}}^3$ of carbon dioxide is produced, measured under room conditions. ● X reacts with 2,4-dinitrophenylhydrazine reagent to give an orange crystalline product. ● X does not give a yellow precipitate with alkaline ${\mathrm{I}}_2(\mathrm{a}\mathrm{q})$. What could be X? A hexan-3-one B propanal C propan-1-ol D propanone

A sample of but-2-enoic acid, $\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}$, is analysed using infrared spectroscopy. The infrared spectrum shows a broad peak in the range $2500\text{–}3000{\text{ cm}}^{-1}$.

Which bond is responsible for this peak? A $\mathrm{C}=\mathrm{C}$ B $\mathrm{C}=\mathrm{O}$ C $\mathrm{C}-\mathrm{O}$ D $\mathrm{O}-\mathrm{H}$