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.
What number of protons, neutrons and electrons are present in the ion 54Fe3+?
For which hydrocarbon are the molecular and empirical formulae the same?
Which molecule does not have any 90° or 180° bond angles?
The following data are needed for this question. NaHCO3(s) + HCl(aq) → NaCl(aq) + H2O(l) + CO2(g) ΔH = -38.97 kJ mol-1 Na2CO3(s) + 2HCl(aq) → 2N...
In the redox reaction shown, how do the oxidation states of vanadium and sulfur change? VO2+ + SO2 → V3+ + SO42-
The equation for the reaction between silver chloride and aqueous ammonia is shown. AgCl(s) + 2NH3(aq) ⇋ [Ag(NH3)2]+(aq) + Cl-(aq) What are the uni...
Sodium azide, NaN3, decomposes as shown. 2NaN3 → 2Na + 3N2 Which volume of nitrogen, measured at room temperature and pressure, will be produced by...
A stable ion N5+ has been produced by research chemists. Which structure is most likely to show the electron arrangement of this ion?
1.8 g of water, heated to 227 °C in a sealed container, turns to steam with a pressure of 200 kPa. What is the approximate volume of the container?
When the equation is correctly balanced, what is the value of c? aC2H4 + bH2O + cH+ + 2MnO4- → dC2H6O2 + eMn2+
The main stage in the Contact process is an equilibrium reaction. 2SO2 + O2 ⇌ 2SO3 Which row describes the effect of the named condition on the equ...
X and Y are oxides of different Period 3 elements. If one mole of X is added to water, the solution formed is neutralised by exactly one mole of Y....
Compound Z is insoluble in water but soluble at low pH. What could be compound Z?
Hot aqueous sodium hydroxide reacts with chlorine. 6NaOH(aq) + 3Cl2(g) → 5NaCl(aq) + NaClO3(aq) + 3H2O(l) Which statement is correct?
Solid ammonium nitrate is put into a test-tube and solution X is added to it. The resulting mixture is warmed and the gas given off is tested with ...
Sodium, magnesium and aluminium are three elements in Period 3 of the Periodic Table. Each element forms an oxide. Which row is correct?
A student investigates calcium nitrate crystals by heating them in the apparatus shown. A colourless gas leaves the apparatus at Y. A flame is held...
How does concentrated sulfuric acid behave when it reacts with sodium chloride?
Which statement about nitrogen or its compounds is correct?
Which pair of compounds are functional group isomers of each other?
Which row identifies a suitable starting material and reagent that can be used to produce butanenitrile?
The diagram shows the structure of ethanedioic acid. [Figure 22.1] Ethanedioic acid reacts with ethanol in the presence of a few drops of concentra...
The infrared spectrum shown was obtained from a compound J. [Figure 23.1] Which statement about J is correct?
A section of a polymer chain is shown. [Figure 24.1] What is the correct monomer?
An excess of dry HBr is warmed with compound Y. [Figure 26.1] What is the major product of the reaction?
Which reaction would produce propanoic acid as one of its products?
Compound X is treated with an excess of lithium aluminium hydride. The reaction is allowed to go to completion. [Figure 28.1] What is the structure...
What is the skeletal formula of the compound formed when CH3CH=CHCH2OH is heated, under reflux, with K2Cr2O7/H+?
The diagram shows the structure of compound Q. [Figure 30.1] Two of the rings, X and Y, contain a C=C bond. Which row is correct?
Carbon and nitrogen are adjacent in the Periodic Table. Which properties do they both have? 1 There is an empty 2p orbital in each atom of the elem...
The strong hydrogen bonding present in liquid water causes an increase in which properties? 1 viscosity 2 boiling point 3 surface tension
A reaction between carbon and oxygen is shown. C(s) + ½O2(g) → CO(g) How can the standard enthalpy change of this reaction be described correctly? ...
Hydrochloric acid reacts with zinc. 2HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g) What will increase the rate of this reaction but will not change the Boltz...
The element astatine, At, is below iodine in Group 17 of the Periodic Table. Which statements concerning At are likely to be correct? 1 It is a dar...
Which statements are correct? 1 Aluminium chloride dissolves in water to give an acidic solution. 2 Magnesium chloride dissolves in water to give a...
Ethanal and hydrogen cyanide react together. The reaction mechanism involves cyanide ions. [Figure 37.1] Which statements about this mechanism are ...
Which compounds will produce a yellow precipitate with alkaline aqueous iodine? [Figure 38.1]
Which statements apply to tetrafluoromethane? 1 It is rapidly decomposed by ultraviolet radiation. 2 It is less harmful to the ozone layer than dic...
Which statements comparing ethene and ethane are correct? 1 The bond angles in ethene are larger than the bond angles in ethane. 2 Ethene reacts mu...
Group 2 metals form alkaline solutions in water.
The Group 17 elements, chlorine, bromine and iodine, are non-metals that show trends in their physical and chemical properties.
Glycerol, CH2(OH)CH(OH)CH2OH, is widely used in the food industry and in pharmaceuticals.
In this experiment you will determine the enthalpy change, AH, for the catalytic decomposition of hydrogen peroxide into water and oxygen. H2O2(aq)...
Iron is a transition element in the fourth period. Iron forms compounds containing the ions Fe²⁺ and Fe³⁺.
Group 2 metals form stable carbonates and sulfates.
Gold is an unreactive metal that can only be oxidised under specific conditions. Some relevant half-equations and their standard electrode potentia...
Compound F has been found in small quantities in some cereals and dried fruit. [Figure 4.1]
Gallic acid, C₇H₆O₅, is a naturally occurring aromatic molecule. [Figure 5.1]
Valinol can be synthesised by the following reactions. Reaction 1 uses valine as the starting material. [Figure 6.1]
Brass is an alloy of copper and zinc. Typical copper concentrations vary from 50% to 85%, depending upon the properties needed in the alloy. There ...