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.
When hydrated copper hydroxycarbonate, CuCO3.Cu(OH)2.yH2O is heated, it decomposes as shown. CuCO3.Cu(OH)2.yH2O(s) → 2CuO(s) + CO2(g) + (1 + y)H2O(...
FB 5 contains one cation and one anion from those listed in the Qualitative Analysis Notes.
2 In this experiment you will determine the enthalpy change of solution for hydrated sodium thiosulfate. FA 3 is hydrated sodium thiosulfate, Na2S2...
Aqueous solutions of copper(II) salts contain the blue-coloured [Cu(H2O)6]²+ complex ion. Separate portions of this blue solution react with aqueou...
Group 2 nitrates decompose when heated. Write an equation for the decomposition of strontium nitrate.
Chlorate(V) ions are powerful oxidising agents.
Sketches of the shapes of some atomic orbitals are shown. Identify the type of orbital, s, p, or d. [Figure 4.a]
Chlorate(I) ions undergo the following reaction under aqueous conditions. 2NH3 + ClO⁻ → N₂H₄ + Cl⁻ + H₂O A series of experiments was carried out at...
Complete the table by placing one tick (✔) in each row to indicate the sign of each type of energy change under standard conditions. [Table 6.a: en...
Benzene can be converted into cyclohexane. [Figure 7.a]
The mass spectrum of compound X, C5H10O2, is recorded. The peak heights of the M and M+1 peaks are 22.65 and 1.25 respectively.
Organochlorine compounds can undergo hydrolysis. R-Cl + H₂O → R−OH + HCl
Complete the electronic configuration of the copper(II) ion. 1s²2s²2p⁶
Group 2 carbonates decompose when heated. Write an equation for the decomposition of the carbonate ion.
Sketch the shape of a d orbital.
The initial rate of reaction for propanone and iodine in acid solution is measured in a series of experiments at a constant temperature. H⁺ catalys...
Complete the table by placing one tick (✓) in each row to indicate the sign of each type of energy change under standard conditions. [Table with en...
By reference to the formation of σ and π bonds, describe and explain the shape of a benzene molecule, C₆H₆.
Amino acids can be separated by thin-layer chromatography. A mixture of amino acids is analysed using this technique. The chromatogram obtained is ...
Compound R is shown. [Figure X.X]
Group 2 nitrates decompose when heated.
Sketches of the shapes of some atomic orbitals are shown.
Chlorate(I) ions undergo the following reaction under aqueous conditions. 2NH3 + ClO- → N2H4 + Cl- + H2O A series of experiments was carried out ...
Benzene can be converted into cyclohexane.
The mass spectrum of compound X, C5H10O2, is recorded.
Organochlorine compounds can undergo hydrolysis. R-Cl + H2O → R−OH + HCl
A student investigates the charge (z+) carried by aqueous manganese ions, Mn²+(aq). The electrochemical cell shown is set up for this investigation...
A student plans to prepare propanone from propan-2-ol and test the product. Reagents provided to the student and some of their hazards are shown in...
A student is provided with samples of six metal carbonate ores, known to be ores of the metals barium, calcium, copper, iron, lead and zinc. All th...
An investigation is done to find the percentage of copper in a brass nail. The brass nail is dissolved in concentrated nitric acid and the resultin...
In which carbon allotrope are all electrons localised?
A copper ore contains 3.00% of copper carbonate, CuCO3, by mass. Which mass of copper would be obtained from 1 tonne of the ore?
The catalysed formation of ammonia by the Haber process can be represented by the equation shown. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔH = −92 kJ mol⁻¹ Which ...
Solid sulfur consists of S8 molecules. Which equation represents the standard enthalpy of atomisation of sulfur?
In this question you should use changes in oxidation numbers to balance a chemical equation. The following reaction occurs when MnO2 is warmed with...
In this question you should assume air contains 21% oxygen. What is the minimum volume of air required to ensure complete combustion of 10 cm³ of b...
When aqueous bromine is shaken with cyclohexane and allowed to stand, two layers form. The top cyclohexane layer is coloured and the bottom aqueous...
In which change are only temporary dipole-induced dipole forces overcome?
The complete combustion of 2 moles of an alkane produces 400 dm³ of carbon dioxide measured at 301 K and 1 × 10⁵ Pa. Carbon dioxide can be assumed ...
In which reaction does an element undergo the largest change in oxidation number?
PCl5 decomposes as shown. PCl5(g) ⇌ PCl3(g) + Cl2(g) 1.0 mol of PCl5(g), 1.0 mol of PCl3(g) and 1.0 mol of Cl2(g) are placed in a container of volu...
The fifth to eighth ionisation energies of four elements in Period 3 of the Periodic Table are shown. Which row refers to chlorine? ionisation ener...
Magnesium nitrate, Mg(NO3)2, decomposes when heated to give a white solid and a mixture of gases. One of the gases released is an oxide of nitrogen...
Which statement explains why iodine is less volatile than chlorine?
Ammonium carbonate is a crystalline solid. On gentle warming a reaction occurs, forming ammonia as one product. How are the carbonate ions behaving...
One molecule of an oxide of element Z reacts with six molecules of water to produce an acidic compound. What is element Z?
Which property shows an increase from magnesium to barium?
A test-tube of HBr(g) and a separate test-tube of HI(g) are heated to the same temperature. Which combination of observations is possible? test-tu...
Most modern cars are fitted with catalytic converters in the exhaust system. Which three gases are removed by a catalytic converter?
Compound X is shown. [Diagram of Compound X: a benzene ring with -COOH and -OH attached to adjacent carbons.] X is treated separately with NaOH(aq)...