Cambridge & Pearson Edexcel Past Paper Questions
Browse 35,704 questions from Cambridge O-Level & A-Level and Pearson Edexcel IGCSE & IAL exams. Click any question to practice.
The Group 2 elements Mg to Ba are all silvery-white reactive metals.
Alkenes undergo an addition reaction with a 1:1 mixture of CO and H₂ to form aldehydes. Fig. 3.1 shows the reaction of propene with a 1:1 mixture o...
Fig. 4.1 shows some reactions of compound D, 2-bromobutane. [Fig. 4.1]
In this experiment you will determine the relative formula mass, Mr, of basic zinc carbonate, ZnCO3•2Zn(OH)2•xH2O, by an alternative method. A know...
Qualitative Analysis For each test you should record all your observations in the spaces provided. Examples of observations include: • colour chang...
The most common zinc mineral contains zinc(II) sulfide, ZnS.
Hypophosphorous acid is an inorganic acid. The conjugate base of hypophosphorous acid is H2PO2⁻.
Vanadium is a transition element in Period 4 of the Periodic Table.
Ethylamine and phenylamine are primary amines. ethylamine CH3CH2NH2 phenylamine NH2 [Figure 4.1]
Tulobuterol is used in some medicines. tulobuterol Cl OH H N [Figure 5.1]
A student uses thin-layer chromatography (TLC) to analyse a mixture containing different metal cations. The student repeats the experiment using di...
Aqueous iron(II) ions, Fe2+(aq), are usually kept in acidic conditions to prevent them readily oxidising to aqueous iron(III) ions, Fe3+(aq). Fe2+...
The reaction between iodide ions, I⁻(aq), and aqueous hydrogen peroxide, H2O2(aq), takes place in acidic conditions. reaction 1 2I⁻(aq) + H2O2(aq)...
Which species contains the same number of neutrons as ¹⁴C and the same number of electrons as ²³Na⁺?
Which process has the largest enthalpy change per mole?
Which sodium compound contains 74.2% by mass of sodium?
What is the maximum volume of sulfur dioxide gas measured at room conditions produced from burning 100 dm³ of diesel fuel containing 0.8346 g of su...
Which row shows the correct number of covalent bonds in a molecule of methylpropene?
Aluminium chloride exists as Al₂Cl₆ molecules at room temperature. When heated to a high temperature, AlCl₃ molecules are formed. What are the arra...
The table shows the physical properties of four substances. Which substance has a giant covalent structure?
At room temperature and pressure, H₂O is a liquid and H₂S is a gas. What is the reason for this difference of state?
The enthalpy change for a reaction can be calculated from values of: • enthalpies of formation, ∆Hᶠ • enthalpies of combustion, ∆Hᶜ • bond energies...
Which reaction has an enthalpy change equal to the standard enthalpy change of formation of propane?
One of the reactions in the rechargeable lead/acid battery is shown. Pb(s) + PbO₂(s) + 4H⁺(aq) + 2SO₄²⁻(aq) → 2PbSO₄(s) + 2H₂O(l) Which statement a...
KMnO₄ is an oxidising agent. Its reaction with Fe²⁺ is shown in the following ionic equation. ...X...MnO₄⁻ + ......Fe²⁺ + H⁺ → ......Mn²⁺ + ..Y...F...
Nitrogen and hydrogen are mixed in a reaction vessel. The reaction reaches equilibrium giving a mixture of nitrogen, hydrogen and ammonia gases. N₂...
A mixture of hydrogen gas and iodine gas is placed in a reaction vessel of volume V at temperature T. The reaction H₂ + I₂ ⇌ 2HI is allowed to come...
Two experiments are carried out to study the reaction between zinc and sulfuric acid. experiment 1 Small lumps of zinc are added to excess dilute s...
The relative magnitude of the property X of five elements is shown. P, Q, R, S and T are all in Period 3 and have consecutive atomic numbers. The l...
Element X is in Period 3. Element X reacts with oxygen to produce a solid, Y. When solid Y is added to water, a solution with a pH of less than 7 i...
This question refers to isolated gaseous species. The species F⁻, Ne and Na⁺ are isoelectronic. This means they have the same number of electrons. ...
Separate samples of magnesium and calcium are added to an excess of dilute sulfuric acid. The observations are summarised in the table. metal: magn...
Dolomite is a double carbonate, CaMg(CO₃)₂, and can be used instead of calcium carbonate for treating acidic soils. The three statements all refer ...
This question is about two salts, NaI and NaCl. The two solid salts are separately added to warm concentrated H₂SO₄ and the results noted. Aqueous ...
The diagram shows the process of adding calcium nitrate and strontium nitrate to separate boiling tubes and heating them. Identical conditions are ...
The equations for three reactions involving chlorine or its compounds are listed. 1 2KClO₃ → 2KCl + 3O₂ 2 4KClO₃ → 3KClO₄ + KCl 3 6KOH + 3Cl₂ → 3H₂...
Nitrogen monoxide, NO, is a primary pollutant produced by petrol engines and is found in their exhaust gases. Which reaction occurs in a catalytic ...
The diagram shows the structure of the naturally occurring molecule cholesterol. [Figure showing the skeletal structure of cholesterol] Student X s...
The drug cortisone has the formula shown. [Figure showing the skeletal structure of cortisone with three chiral centers marked by asterisks] In add...
But-2-ene reacts with cold dilute acidified KMnO₄ to give product X. But-2-ene reacts with hot concentrated acidified KMnO₄ to give product Y. Whic...
A sequence of reactions takes place. The major product is compound Z. [Figure showing reaction scheme: propanoic acid --(LiAlH₄)--> compound X --(c...
Which statement is correct?
In the hydrolysis of bromoethane by aqueous NaOH, what is the nature of the attacking group and of the leaving group?
X is an organic compound containing the elements carbon, hydrogen and oxygen only. The table shows the observations made from three chemical tests ...
How many moles of oxygen gas are needed for the complete combustion of 1 mol of (CH₃)₃COH?
In which pair will each compound give a different visible result with alkaline I₂(aq)?
Which reagent gives a positive result with propanone?
Esters can be hydrolysed with an aqueous alkali or an aqueous acid to form two products. The table compares the two methods. Which row is correct?
Structural isomerism only should be considered when answering this question. How many compounds with molecular formula C₅H₁₁Br are primary halogeno...
Compound Z is formed by the reaction scheme shown. [Figure showing reaction scheme: CH₃CH₂Br --(warm with KCN in ethanol)--> compound X --(reflux w...