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.
Which reactions produce pentanoic acid? 1 CH₃CH₂CH₂CH(OH)CH₃ + H⁺/MnO₄⁻(aq) 2 CH₃OCO(CH₂)₃CH₃ + HCl(aq) 3 CH₃(CH₂)₃CN + H₂SO₄(aq)
The graph shows the first ionisation energies of some of the elements in Group 2. [Figure 1.1]
Phosphorus, sulfur and chlorine can all react with oxygen to form oxides.
The reducing agent LiAlH4 can be synthesised by reacting aluminium chloride with lithium hydride, LiH.
Iodine is used in many inorganic and organic reactions.
Atoms contain the subatomic particles electrons, protons and neutrons. Protons and electrons were discovered by observations of their behaviours in...
The Period 3 elements, Na to S, all react with oxygen to form oxides.
PCl5, PCl3 and NCl3 are halides of Group 15 elements.
Some reactions of compound G are shown. [Figure 4_G_scheme]
In this experiment you will determine the value of x in the formula of hydrated sodium thiosulfate, Na2S2O3•xH2O, where x is an integer. You will f...
When a solution containing thiosulfate ions, S2O32-, is acidified the following reaction occurs. S2O32-(aq) + 2H+(aq) → S(s) + SO2(g) + H₂O(l) Th...
Nitrogen monoxide, NO, reacts with oxygen to form nitrogen dioxide, NO2. 2NO(g) + O2(g) ⇋ 2NO2(g) The rate equation for the forward reaction is sho...
(a) The lattice energies of three ionic compounds are given. compound lattice energy/kJ mol-¹ LiF(s) -1022 CaO(s) -3513 SrO(s) -3310
Identify the substances liberated at the anode and at the cathode during the electrolysis of aqueous sodium sulfate, Na2SO4(aq). anode ..............
Give the mathematical expression for each of the terms pH and Kw.
A solution is made by dissolving CuSO4•5H2O in an excess of aqueous ammonia. This solution contains the copper complex [Cu(NH3)4]2+. The solution ...
(a) When 1.0 mol dm⁻³ Na2S2O3(aq) is added to a solution containing Ag+(aq) ions, a linear complex, P, is formed. S2O32- ions are present in P as m...
Phenol, C6H5OH, is a weak acid.
Benzene, C6H6, can be obtained from crude oil.
The proton NMR spectrum of compound E in the solvent CDCl3 is shown. The molecular formula of compound E is C9H10O2. [Figure of proton NMR spectrum...
(a) The table shows three pairs of monomers that are capable of polymerisation. Complete the table by identifying each type of polymerisation. [T...
The rate of the reaction H2(g) + I2(g) ⇌ 2HI(g) is studied.
Write an expression for the Ka of the weak acid HA in terms of the concentrations of the species involved. Ka =
(a) The energy cycle shown can be used, along with suitable data, to calculate the enthalpy change of hydration of Ca²⁺(g). Each arrow indicates a ...
Identify the substances liberated at the anode and at the cathode during the electrolysis of saturated KCl(aq). at the anode at the cathode
(a) Ethanoic acid, CH3CO₂H and trichloroethanoic acid, CCl3CO₂H, are both carboxylic acids. Ethanoic acid can be used to make ethanamide, CH3CONH2.
Describe the structure of a benzene molecule, C6H6. Your answer should include: • the shape of the molecule • the relative lengths of the C-C bonds...
The lattice energies of three ionic compounds are given. compound lattice energy/kJ mol¯¹ LiF(s) -1022 CaO(s) -3513 SrO(s) -3310 Define the term la...
The equation representing the standard electrode potential, E°, for the reduction of MnO₄⁻(aq) to Mn²⁺(aq) in acid solution is given. MnO₄⁻(aq) + 8...
Water and octan-1-ol form two layers when mixed. Ethanamide is more soluble in water than it is in octan-1-ol. When 1.00g of ethanamide is added to...
A solution is made by dissolving CuSO₄•5H₂O in an excess of aqueous ammonia. This solution contains the copper complex [Cu(NH₃)₄]²⁺.
When 1.0 mol dm³ Na₂S₂O₃(aq) is added to a solution containing Ag⁺(aq) ions, a linear complex, P, is formed. S₂O₃²⁻ ions are present in P as monode...
Phenol, C₆H₅OH, is a weak acid.
Benzene, C₆H₆, can be obtained from crude oil.
The proton NMR spectrum of compound E in the solvent CDCl₃ is shown. The molecular formula of compound E is C₉H₁₀O₂. [Figure X.X]
The table shows three pairs of monomers that are capable of polymerisation. Complete the table by identifying each type of polymerisation.
Aqueous potassium manganate(VII) can be used to determine the amount of iron present in a sample of iron wire by redox titration. Before potassium ...
A student uses the apparatus shown to calculate the relative molecular mass, Mr, of a gaseous alkane. The experiment took place at 298K and 101kPa....
Calcium hydroxide, Ca(OH)₂, is slightly soluble in water. Aqueous calcium hydroxide is also known as limewater. A student measures the concentratio...
Sodium thiosulfate reacts with excess dilute hydrochloric acid according to the following equation. Na₂S₂O₃(aq) + 2HCl(aq) → 2NaCl(aq) + S(s) + SO₂...
A student investigates the reaction between magnesium and hydrochloric acid to determine the order of reaction with respect to hydrochloric acid. T...
Compound X consists of 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass. What is the empirical formula of compound X?
Technetium (Tc) is a second row transition element that does not occur naturally on Earth. One of its isotopes has 56 neutrons. What is the nucleon...
Which atom has more unpaired electrons than paired electrons in orbitals of principal quantum number 2?
Atom X is the central atom in a molecule. In this molecule, atom X has four pairs of valence electrons in its outer shell. The four pairs of valenc...
The strength of hydrogen bonding increases as the electronegativity of the element bonded to hydrogen increases. Some information for a range of hy...
The general gas equation can be used to calculate the value of the Mr of a gas. For a sample of a gas of mass m grams, which expression will give t...
The equation for the formation of ammonium chloride is shown. NH3(g) + HCl(g) ⇌ NH4Cl(s) ΔH = −314 kJ mol⁻¹ Which diagram shows the correctly label...
In a catalytic converter in the exhaust system of a car, carbon monoxide is oxidised to carbon dioxide, and nitrogen monoxide is reduced to nitroge...
NO and NO2 are both present in the lower atmosphere as pollutants. The reaction sequence shows the production of ozone from oxygen in the lower atm...