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 ester C2H5CO2CH2CH2CH3 can be made in a school or college laboratory by a sequence of four reactions or fewer using compound Z as the only orga...
Sulfuric acid is manufactured by the Contact process. One stage in this process is the conversion of sulfur dioxide into sulfur trioxide in the pre...
Crude oil is a complex mixture of hydrocarbon molecules. The hydrocarbon molecules in crude oil are separated by fractional distillation. Fractiona...
The elements in the third period exhibit periodicity in both their chemical and physical properties.
X is CH3CH(OH)CH2CH3. The reaction between X and alkaline aqueous iodine produces a yellow precipitate. Give the name of the compound formed as a y...
Sodium and magnesium are the first two elements in the third period.
Ammonium iron(II) sulfate, (NH4)2Fe(SO4)2, has a relative formula mass, M₁, of 284.
Most vehicle fuels contain hydrocarbons obtained from crude oil.
W is CH3COCH2CH3. The reaction between W and alkaline aqueous iodine produces a yellow precipitate.
The elements sodium to chlorine, in the third period, all form oxides.
One reason for the wide variety of organic compounds is isomerism, either structural isomerism or stereoisomerism.
The elements in Group 17, the halogens, show trends in both their chemical and physical properties. The elements and their compounds have a wide va...
A is CH3CHBrCH2CH3. Some reactions of A are shown. [Figure showing reaction scheme] Name A.
In this question you will determine the identity of the halogen in compound W. Compound W is the halogenoethanoic acid CH2XCO₂H, where X is a halog...
2 In this experiment you will determine the enthalpy change, ∆H, for the decomposition of calcium hydroxide to calcium oxide. Ca(OH)2(s) → CaO(s) +...
2 When an acid reacts with an alkali the neutralisation reaction is always exothermic. H⁺(aq) + OH⁻(aq) → H₂O(l) You will determine the enthalpy ch...
Sodium oxide, Na2O, is a white crystalline solid with a high melting point.
Nitrogen monoxide, NO(g), reacts with hydrogen, H2(g), under certain conditions. 2NO(g) + 2H2(g) → N2(g) + 2H2O(g)
Complete the table, identifying the substance liberated at each electrode during electrolysis with inert electrodes.
Describe what you would see when calcium and barium are heated separately with oxygen. calcium barium
Copper is a transition element with atomic number 29.
(a) Benzene reacts with D in the presence of a suitable catalyst to give cumene and non-organic product E. This is an electrophilic substitution re...
The three substances shown all have some acidic properties. [Figures of propanoic acid, propan-1-ol, phenol]
Abscisic acid, C15H20O4, is a plant hormone. [Figure of abscisic acid structure]
Noradrenaline is a hormone found in humans. [Figure of noradrenaline structure]
Silicon tetrachloride, SiCl4, is formed when silicon reacts with chlorine under suitable conditions. It is a colourless liquid with a low boiling p...
Iodine monochloride, ICl, is a yellow-brown gas. It reacts with hydrogen gas under certain conditions as shown. 2ICl(g) + H2(g) → 2HCl(g) + I2(g) E...
Complete the table by predicting the identity of the substance liberated at each electrode during electrolysis with inert electrodes. electrolyte |...
Write an equation, including state symbols, for the reaction that takes place when a sample of anhydrous calcium nitrate, Ca(NO3)2, is heated stron...
Cobalt is a transition element with atomic number 27. Cobalt forms ions with charges of +2 and +3. Both these ions form complexes.
Phenol is an important industrial chemical used in the manufacture of dyestuff and other substances.
Asparagine and valine are two naturally occurring amino acids. [Figure showing structures of asparagine and valine]
Calcitriol is a steroid hormone found in human blood. [Figure showing structure of calcitriol]
Benzene reacts with D in the presence of a suitable catalyst to give cumene and non-organic product E. This is an electrophilic substitution reacti...
The three substances shown all have some acidic properties. [Figure showing structures of propanoic acid, propan-1-ol, phenol]
Abscisic acid, C15H20O4, is a plant hormone. [Figure showing structure of abscisic acid]
Noradrenaline is a hormone found in humans. [Figure showing structure of noradrenaline]
The Faraday constant is the charge in coulombs, C, carried by 1 mole of electrons.
At temperatures above 5°C, the benzenediazonium ion, C₆H₅N₂⁺, reacts with water as shown. C₆H₅N₂⁺(aq) + H₂O(l) → C₆H₅OH(aq) + N₂(g) + H⁺(aq) A st...
When concentrated iron(III) chloride is added to water at just below boiling point, a reaction occurs and produces Fe2O3, seen as a red colour in t...
Water boils when the pressure of its vapour above the liquid surface is equal to the atmospheric pressure. When substances are dissolved in water, ...
At temperatures above 5°C, the benzenediazonium ion, C₆H₅N₂⁺, reacts with water as shown. C₆H₅N₂⁺(aq) + H₂O(l) → C₆H₅OH(aq) + N₂(g) + H⁺(aq) A stud...
The Boltzmann distribution of molecular energies in a sample of aqueous hydrogen peroxide at room temperature is shown. [Figure 1.1] Which diagram ...
Oxygen has three stable isotopes, 16O, 17O and 18O. All three isotopes are present in a sample of oxygen gas, O2, which was analysed using a mass s...
The first eight successive ionisation energies for two elements of Period 3 of the Periodic Table are shown in the graphs. [Figure 3.1] What is the...
A σ bond is made between two carbon atoms in a molecule of ethene. Which diagram shows the orbital overlap that occurs to form this bond?
The table shows some properties of four substances. Which substance could be potassium iodide? melting point of solid/°C electrical conductivity wh...
X, Y and Z are all gases that behave ideally and react according to the equation shown. X(g) + 2Y(g) → 2Z(g) When 3.0 mol of X and 3.0 mol of Y are...
Which pair of substances are both simple molecular?
A reaction pathway diagram is shown. [Figure 8.1] Which row is correct? enthalpy change of the forward reaction activation energy of the reverse ...