AS & A Level Chemistry - 9701 Paper 1 2017 Summer Zone 2

In which species are the numbers of protons, neutrons and electrons all different?

Which would contain $9.03 \times 10^{23}$ oxygen atoms?

In some fireworks there is a reaction between powdered aluminium and powdered barium nitrate. Heat is evolved, an unreactive gas is produced, and all nitrogen atoms are reduced.
What is the equation for this reaction?

Which organic compound has the highest boiling point?

At a temperature of 2500 K and a pressure of $1.00 \times 10^{-4}$ Pa a sample of 0.321 g of sulfur vapour has a volume of $2.08 \times 10^{6}$ m$^3$.
What is the molecular formula of sulfur under these conditions?

Which reaction involves a decrease in the bond angle at a carbon atom?

In the high temperatures of car engines, nitrogen reacts with oxygen to give nitrogen monoxide. $$\frac{1}{2} N_2(g) + \frac{1}{2} O_2(g) \rightarrow NO(g) \quad \Delta H^\circ = +90 \, \text{kJ} \, \text{mol}^{-1}$$
This reaction has activation energy $E_a$.
Which reaction pathway diagram could correctly represent this reaction?

A reaction sequence is shown.

In each stage of this sequence the sulfur is oxidised, reduced or neither oxidised nor reduced.
Which row is correct?

Hydrogen and carbon dioxide gases are mixed at 800K. A reversible reaction takes place.
$$ \text{H}_2(g) + \text{CO}_2(g) \rightleftharpoons \text{H}_2\text{O}(g) + \text{CO}(g) $$
At equilibrium, the partial pressures of $\text{H}_2$ and $\text{CO}_2$ are both 10.0 kPa. $K_p$ is 0.288 at 800K. What is the partial pressure of CO in the equilibrium mixture?

A reaction involved in the Contact process is shown.
$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g) \quad \Delta H^\circ = -197 \, \text{kJ mol}^{-1}$
The reaction is investigated at 200 kPa and 700 K and the value of the equilibrium constant, $K_p$, is found to be Y. The reaction is then investigated at 1000 kPa and 700 K and the value of $K_p$ is found to be Z.
Which statement comparing Y and Z is correct?

The Boltzmann distribution for the hydrogenation of an alkene at a particular temperature in the absence of a catalyst is shown. Which row correctly describes the effects of adding nickel to the reaction vessel?

The elements magnesium and sulfur each form doubly charged ions. How do the atomic radii and ionic radii of these elements compare? [Table_1]

Which graph correctly shows relative electronegativity plotted against relative atomic radius for the elements Na, Mg, Al and Si?

Trends are seen in the physical and chemical properties of the elements of Group 2 and their compounds.
Which property shows a decrease from magnesium to barium?

Calcium oxide is added to water and the resulting mixture is filtered. This filtrate is X.
When carbon dioxide is bubbled through filtrate X, a white precipitate is formed.
Which equation for this reaction of filtrate X with carbon dioxide is correct?

Element X reacts with cold, dilute, aqueous sodium hydroxide to form two different chlorine-containing products, Y and Z.
What are the oxidation states of chlorine in Y and Z? [Table_1]

A powder is known to be either a single sodium halide or a mixture of two sodium halides. A sample of the powder was dissolved in water.
Aqueous silver nitrate was added, and a pale yellow precipitate was formed. When concentrated aqueous ammonia was then added, this precipitate partly dissolved leaving a darker yellow precipitate.
What might the powder be?

The ammonium ion is formed by the following reaction.
$$\text{NH}_3 + \text{H}^+ \rightarrow \text{NH}_4^+$$
Which statement about the species involved in this reaction is correct?

A chemist took 2.00 dm$^3$ of nitrogen gas, measured under room conditions, and reacted it with a large volume of hydrogen gas to produce ammonia. Only 15.0% of the nitrogen gas reacted to produce ammonia.
Which mass of ammonia was formed?

A carbonyl compound X will react with HCN in the presence of NaCN to make a compound with $M_r$ 85. Compound X does not react with Fehling's reagent.
What is X?

Geraniol and linalool are compounds found in some flower fragrances.

Which statement is correct?

Which equation represents the initiation step of the substitution reaction between methane and chlorine?

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

A sample of 2.76g of ethanol was mixed with an excess of aqueous acidified potassium dichromate(VI). The reaction mixture was then boiled under reflux for one hour. The required organic product was then collected by distillation.
The yield of product was 75.0%.
Which mass of product was collected?

Compound X is a single, pure, optical isomer. X is heated with an excess of concentrated $\text{H}_2\text{SO}_4$. Only one organic product is formed. What could X be?

2-bromo-2-methylpropane undergoes nucleophilic substitution when heated under reflux with an aqueous solution of sodium hydroxide.
Which row is correct?
[Table_1]

H_2NNHC_6H_3(NO_2)_2 is the structural formula of 2,4-DNPH.
Many, but not all, organic reactions need to be heated before reaction occurs.
Which reaction occurs at a good rate at room temperature (20°C)?

A carboxylic acid, P, has no possible chain isomers. It reacts with an alcohol, Q, that has only one positional isomer. What could be the ester formed from a reaction between P and Q?

Which compound is chiral and reacts with Na$_2$CO$_3$ to give CO$_2$?

Which compound, when hydrolysed, gives propanoic acid and propan-2-ol?

An isolated gaseous atom of element X has paired electrons in at least one of its 3d orbitals and has a filled 4s subshell. What could be the identity of element X?
1 iron
2 gallium
3 copper

Which allotropes of carbon have a giant molecular structure?

Which statements about endothermic reactions are correct?
1. On the reaction pathway diagram the products of the reaction are lower than the reactants.
2. There is a net transfer of heat energy from the surroundings to the reacting system.
3. The total bond energies of the reactants > the total bond energies of the products.

The rate of chemical reactions can be increased by the addition of a suitable catalyst.
For which reactions can a heterogeneous catalyst be used?
1. $\text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3$
2. $2\text{SO}_2 + \text{O}_2 \rightleftharpoons 2\text{SO}_3$
3. $2\text{NO} + 2\text{CO} \rightleftharpoons \text{N}_2 + 2\text{CO}_2$

Which chlorides, when added to water, can produce a solution with a pH of less than 5?

Acid rain continues to be a problem.
Which statements about acid rain are correct?
1. Acid rain is formed when oxides of nitrogen or oxides of sulfur react with water in the atmosphere.
2. Acid rain causes an increase in the concentration of heavy metal ions in water courses.
3. Nitrogen dioxide will catalyse the formation of $\text{SO}_3$ from $\text{SO}_2$ in the atmosphere.

Which compounds contain a chiral centre?
1. 2-hydroxybutanoic acid
2. 3-hydroxybutanoic acid
3. 4-hydroxybutanoic acid

The diagram shows the monomer used to make polyvinyl chloride, PVC.

Assuming that one particular molecule of the polymer forms from $n$ molecules of the monomer (where $n$ is many thousands), which statements are correct?
1. The relative molecular mass of this polymer molecule is approximately $62.5n$.
2. There are $n$ chiral carbon atoms in this polymer molecule.
3. There are $5n$ σ bonds in one polymer molecule.

An organic compound, X, has the following skeletal formula:

Which statements about X are correct?
1. X is a primary alcohol.
2. X will dehydrate to give a single alkene.
3. X will undergo a substitution reaction with chloride ions.

2,2,4-trimethylpentanal is used in the manufacture of adhesives. Which reagents would 2,2,4-trimethylpentanal react with?
1. 2,4-dinitrophenylhydrazine reagent
2. Tollens' reagent
3. alkaline aqueous iodine