AS & A Level Chemistry - 9701 Paper 1 2024 Summer Zone 2

Which pair of formulae is correct?

How many molecules are present in 62 g of solid white phosphorus, \( P_4 \)?

The first eight successive ionisation energies for two elements of Period 3 of the Periodic Table are shown in the graphs.

What is the formula of the ionic compound formed from these elements?

In which pairs are both species free radicals?
1. $\text{Cl}$ and $\text{O}$
2. $\text{Cl}^-$ and $\text{O}^{2-}$
3. $\text{Cl}$ and $\text{O}^-$
4. $\text{Cl}^+$ and $\text{O}^{2+}$

Which shape is correctly predicted by VSEPR theory?
[Table_1]

In which species does the underlined atom have an incomplete outer shell?

In this question it should be assumed that nitrogen behaves as an ideal gas under the conditions stated.
Which volume is occupied by 1.00 g of nitrogen at 50.0 °C and at a pressure of 120 kPa?

Consider the following four compounds.
1. \((CH_3)_3CH\)
2. \(CH_3CH_2CH_2OH\)
3. \(CH_3CH_2CH_2SH\)
4. \(CH_3CH_2CH_2CH_3\)
What is the order of increasing boiling point of the compounds (lowest first)?

Ethane can react with fluorine to produce 1,2-difluoroethane, $\text{C}_2\text{H}_4\text{F}_2$.
$$\text{C}_2\text{H}_6 + 2\text{F}_2 \rightarrow \text{C}_2\text{H}_4\text{F}_2 + 2\text{HF} \quad \Delta H = -960 \text{ kJ mol}^{-1}$$
[Table_1]
What is the bond energy of the C–F bond in 1,2-difluoroethane?

Which equation has an enthalpy change equal to the standard enthalpy of formation of sodium oxide?

Nitrogen dioxide reacts with water.
$$2\text{NO}_2 + \text{H}_2\text{O} \rightarrow \text{HNO}_2 + \text{HNO}_3$$
Which statement about this reaction is correct?

Phosphorus reacts with concentrated sulfuric acid to produce phosphoric acid, sulfur dioxide and water.
$$aH_2SO_4 + bP \rightarrow cH_3PO_4 + dSO_2 + eH_2O$$
$a$, $b$, $c$, $d$ and $e$ are all whole numbers.
The equation can be balanced by using oxidation numbers.
What is the value of the sum $a + b + c + d + e$?

The volume of ammonia produced against time is measured in two experiments. $$N_2(g) + 3H_2(g) ightleftharpoons 2NH_3(g) \quad \Delta H = -92\text{ kJ mol}^{-1}$$ In experiment 1, 3 mol of H$_2$(g) and 1 mol of N$_2$(g) react together at 45°C and a pressure of 200 atm. A graph showing the volume of ammonia produced against time is plotted. Experiment 2 is then performed. Experiment 2 differs from experiment 1 in one condition only. How does experiment 2 differ from experiment 1?

Which reaction has an equilibrium constant, $K_p$, that has no units?

Gas Q decomposes slowly at room temperature.
$$\text{Q(g)} \rightarrow \text{X(g)} + \text{Z(g)}$$
The Boltzmann distribution curve for gas Q at room temperature is shown.

Which change occurs when a catalyst is added to gas Q?

Which statement is correct?

A mixture of calcium carbonate, calcium nitrate, strontium carbonate and strontium nitrate is thermally decomposed. The decomposition reaction of each substance goes to completion. Each substance is anhydrous.
How many different products are formed?

W is a solid that reacts with water to produce an alkaline solution.
The addition of two drops of dilute $H_2SO_4$ to this alkaline solution produces a white precipitate.
What could be the identity of solid W?

Chlorine gas is reacted with cold aqueous sodium hydroxide.
Which statement is correct for this reaction?

Sodium is added to water to form solution Y. The pH of solution Y is measured. When powdered substance X is added to solution Y, the pH falls. Which two compounds could each be substance X?

The table shows statements about some of the properties of halogens and their compounds and explanations for these properties.
Which row shows a correct statement about the property and a correct explanation for the statement?
[Table_1]

Which statement describes a property of an ammonium ion?

Catalytic converters are fitted in the exhaust systems of many cars.

Gas X:
• causes acid rain if it is released into the air
• is removed from car exhaust fumes by a catalytic converter.

What is gas X?

In the general formula of which class of compound is the ratio of hydrogen atoms to carbon atoms the highest?

Which statement is correct?

Z is a gaseous hydrocarbon which has a density of $3.50 \times 10^{-3} \text{ g cm}^{-3}$ under room conditions.
Z reacts with an excess of hot concentrated acidified KMnO$_4$. Only one type of carboxylic acid is formed in this reaction.
What is Z?

Compound X can be oxidised to compound Y.
Compound Y gives a yellow precipitate with alkaline $I_2$(aq).
What is compound X?

Aqueous NaOH reacts with 1-bromopropane to give propan-1-ol.
What should be included in a diagram of the first step in the mechanism?

In which reaction is the organic compound oxidised?

1 mole of each of the following four compounds is reacted separately with:
• an excess of sodium
• an excess of sodium carbonate.
Which compound produces the same volume of gas with each of the two reagents?

Which reaction will distinguish between propan-1-ol and propan-2-ol?

Compound T has the skeletal formula shown.
Which structure is a structural isomer of compound T?

The diagram shows a simplified structure of coenzyme Q_{10}.
[Image_1: Diagram of coenzyme Q_{10}]
Which row describes the structure of coenzyme Q_{10} correctly?

The molecule of limonene, $C_{10}H_{16}$, contains a 6-membered ring. This is the only cyclic component in its structure. Which volume of hydrogen, at room conditions, is required to react completely with the C=C double bonds in one mole of limonene?

1-bromopropane reacts with hot ethanolic NaOH.
What is the molecular formula of the product in this reaction?

A sample of pent-2-en-4-ol, C$_5$H$_{10}$O, contains all the possible stereoisomers of this compound. How many stereoisomers are there in the sample?

Which pair of reagents reacts to form a product with a chiral carbon atom?

The diagrams show the structures of two esters, X and Y, that are formed in ripening apples.

Which carboxylic acids are formed when these esters are hydrolysed by $H_2SO_4(aq)$?
[Table_1]

An addition polymer is made from monomer Z.

monomer Z:

[Image_1 showing monomer structure]

$\begin{aligned} \text{CH}_2=\text{CH}-\text{C}-\text{OCH}_2\text{CH}_3 \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \,\, \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,~ \end{aligned}$

What is the structure of the polymer made from this monomer?

Compound X reacts with acidified $K_2Cr_2O_7$ to form compound Y.
The infrared spectrum of compound Y is shown.

What is the identity of compound X?