Cambridge & Pearson Edexcel Past Paper Questions

Which equation shows the reaction of ethane with chlorine in the presence of ultraviolet light?

Hexan-3-ol is an alcohol. [Structural formula for hexan-3-ol (CH3-CH2-CH(OH)-CH2-CH2-CH3)]. How many molecules of oxygen are needed for the complet...

An organic compound, P, is dissolved in water. The concentration of the solution is 0.1 mol/dm³ and the pH is 3. A solid is added to the solution a...

A paper chromatography experiment is used to find an Rf value for Fe³⁺(aq). The chromatogram is shown. [Chromatogram showing solvent front, Fe³⁺ sp...

A laboratory has a powdered mixture of solid iodine and solid carbon. Iodine is very soluble in hexane and slightly soluble in water. Carbon is ins...

A sample of iodine is at room temperature and pressure. Which statement about the particles in the sample is correct?

Element Z, nucleon number 31, forms an ion Z³⁻. Where is Z found in the Periodic Table?

Naturally occurring bromine has a relative atomic mass of 80 and consists entirely of two isotopes of relative atomic masses 79 and 81. What can be...

Element X and element Y react together to form a compound. The electronic configurations of X and Y are X = 2,8,3 and Y = 2,6. Which row shows the ...

X is the arrangement of bonds around a carbon atom in graphite. Y is the arrangement of bonds around a carbon atom in diamond. Z is the arrangement...

What is the equation for the reaction between sodium carbonate and dilute nitric acid?

Which statements about relative atomic mass and relative molecular mass are correct? 1 The mass of the different isotopes does not affect relative ...

Aqueous hydrogen peroxide, H2O2, decomposes slowly at 25 °C. 2H2O2(aq) → 2H2O(l) + O2(g) The decomposition reaction takes place faster when a catal...

The diagram shows the structures of the atoms of two elements, X and Z. X and Z are not the atomic symbols for these elements. The elements combine...

Which compound contains 45.2% nitrogen by mass? [Ar: C, 12; H, 1; N, 14]

What is a chemical product of a hydrogen–oxygen fuel cell?

Hydrogen can be produced by reacting methane with steam. CH4 + 2H2O → CO2 + 4H2 Using the bond energies in the table, what is the enthalpy change o...

What is the best way of slowing down the reaction between magnesium and sulfuric acid?

The volume of gas produced by the reaction of 100cm³ of hydrochloric acid with an excess of calcium carbonate is measured in two experiments. The v...

Hydrogen is made industrially by the reaction shown. CO(g) + H2O(g) ⇌ CO2(g) + H2(g) ΔH = –41 kJ/mol Statements about this industrial process are g...

The table refers to two important industrial gaseous reactions. Which catalysts are correctly stated?

Iron(II) ions react with chlorine. 2Fe²⁺(aq) + Cl2(g) → 2Fe³⁺(aq) + 2Cl⁻(aq) Which statement about this reaction is correct?

Which reagent and observation describes the test for a reducing agent?

Compound X is a gas at room temperature. X dissolves in water to give a solution with a pH of 4. Which statement about compound X is correct?

Which statement about hydrochloric acid is correct?

The addition of calcium hydroxide to soil reduces its acidity but also reduces the efficiency of fertilisers. Which two equations explain this? 1 C...

Which anions are contained in salts that are always soluble in water?

The element phosphorus, P, is immediately below nitrogen in the Periodic Table. It forms an oxide with the empirical formula P2O5. From the positio...

The table shows some properties of transition elements and the reasons why they have these properties. Which row shows a correct property and the r...

Which equation is correct?

Metal X reacts with cold water to form a gas. Zinc displaces metal Y from solutions of its salts. The carbonate of metal Z is insoluble. What could...

Which statement about alloys is correct?

Pieces of magnesium can be attached to the steel hull of a ship to prevent rusting. This is sacrificial protection. Which statements about sacrific...

Why is carbon used in water purification?

Which statement about air pollutants is correct?

What is the structural formula of propyl methanoate?

Which statement about ethane is correct?

Isoprene is an alkene which is commonly found in plants. Which properties does isoprene have? 1 It burns in air. 2 It can form polymers. 3 It decol...

The structure of an ester is shown. Which two compounds react to form this ester?

25.0 cm³ of 1.0mol/dm³ sodium hydroxide is titrated with dilute sulfuric acid, using a suitable indicator. 25.0 cm³ of the sulfuric acid is require...

The results of a paper chromatography experiment are shown. X is an aqueous solution of a salt of a Group I element. Y is an aqueous solution of a ...

Aqueous sodium hydroxide is used to identify the ions present in aqueous solutions of compounds Q and R. The results are shown. Which row is correct?

Choose from the following oxides to answer the questions. Al2O3 CO CO2 CaO Fe2O3 H₂O Na₂O SO2 SiO2 Each oxide may be used once, more than once or n...

Group I includes the elements lithium, sodium and potassium.

This question is about the preparation of salts.

This question is about compounds that contain phosphorus.

Ammonium chloride decomposes when heated to make hydrogen chloride and ammonia. This reaction is reversible. The forward reaction absorbs thermal e...

This question is about the energy changes that take place during chemical reactions.

Methanol, propan-1-ol and propan-2-ol are alcohols. The displayed formulae of methanol and propan-1-ol are shown in Fig. 7.1. [Figure 7.1 showing m...

This question is about electrolysis.