2019 A-Level H2 Chemistry Paper 1 — All Solutions

Use of the Data Booklet is relevant to this question. W, X and Y are isotopes of three different elements. An isotope o…

Electrons and protons (subatomic particles) were fired with equal velocity into an electric field.…

Use of the Data Booklet is relevant to this question. The second, third and fourth ionisation energies, IE, of four dif…

The peroxide ion contains two oxygen atoms joined by a single covalent bond. In this question × represents an electron f…

Which species contains two \(\pi\) bonds? 1 \(\text{Al}_2\text{Cl}_6\) 2 \(\text{CO}_2\) 3 \(\text{CH}_3\text{CHO}\) 4 …

Use of the Data Booklet is relevant to this question. At 400 K, the following compounds all behave as ideal gases. \(\…

Use of the Data Booklet is relevant to this question. Some airbags in cars become inflated when nitrogen gas is produce…

The s- and p-block elements in Period 4 show a similar pattern of properties to the elements in Period 3. On this basis…

X is a compound made from two Period 3 elements. It reacts with \(\text{HCl(aq)}\) to give a solution and a gas as shown…

The metals of Group 2, magnesium to barium, show increasing chemical reactivity down the group. Which change helps to e…

Use of the Data Booklet is relevant to this question. 'Solder glass' is composed of 16% boron oxide, \(\text{B}_2\text{…

The following reactions at 298K, form an energy cycle. Which description of one of the enthalpy changes is correct?…

Hydrogen peroxide decomposes to give water and oxygen gas. \(2\text{H}_2\text{O}_2\text{(l)} \rightarrow 2\text{H}_2\te…

The graph shows how the initial rate of reaction varies for an enzyme catalysed reaction as the substrate concentration …

The rates of chemical reactions can often be increased by increasing the concentration of reactants or raising the tempe…

Which molecule contains a total of two sp hybridised atoms?…

Ethers have the general structure \(\text{R}_1-\text{O}-\text{R}_2\) where \(\text{R}_1\) and \(\text{R}_2\) are hydroca…

Propane undergoes free-radical substitution when mixed with chlorine and exposed to ultra-violet light. Which compounds…

The reaction between methylbenzene and ethanoyl chloride is similar to the reaction between methylbenzene and chloroetha…

Compound X is a chloroalkane of molecular formula \(\text{C}_7\text{H}_{15}\text{Cl}\). It undergoes a hydrolysis react…

Thyroxine is produced in the thyroid gland. Which parts of the thyroxine molecule will react with NaOH(aq)?…

Compound Q is heated under reflux with an excess of acidified potassium dichromate (VI).…

The carboxylic acid W, \(\text{C}_5\text{H}_{10}\text{O}_2\), is produced by lactobacillus bacteria during fermen…

A liquid P is sparingly soluble in water. It dissolves readily in cold hydrochloric acid. Evaporation of this solution y…

The compounds responsible for the umami flavour of soy sauce are salts of glutamic acid. \(\text{HO}_2\text{CCH}_2\text…

Use of the Data Booklet is relevant to this question. Assume that the electronic configurations of the second row of th…

When an excess of aqueous sodium hydroxide is added to a solution of chromium(III) chloride, the initial precipitate dis…

Chymotrypsin is an enzyme that hydrolyses proteins into smaller peptides and amino acids. It specifically hydrolyses the…

The following apparatus is assembled to measure the \(E^\circ\) of a half-cell.…

The cathode of a cell is a square piece of copper with dimensions 0.1 m \(\times\) 0.1 m. The electrolyte is copper(II) …