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 statement about a 3p orbital is correct?
The eight species that follow all have covalent bonds. In which pair do the species have different shapes from each other?
Histidine is an amino acid. [Figure 5.1] What are the approximate bond angles 1, 2, and 3?
A sample of gas occupies 240 cm³ at 37 °C and 100 kPa. How many moles of gas are present in the sample?
P, Q and R represent three different structures of an element. [Figure 7.1] Which structures are giant molecular?
The standard enthalpy changes of combustion of carbon, hydrogen and methanol are shown. C(s) + O₂(g) → CO₂(g) ∆Hᶜ = −394 kJ mol⁻¹ H₂(g) + ½O₂(g) → ...
The equation for a chemical reaction is shown. All substances are in their standard states. XeF₆ + 3H₂O → XeO₃ + 6HF Which statement describes the ...
Acidified potassium manganate(VII) reacts with iron(II) ethanedioate, FeC₂O₄. The reactions taking place are shown. MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O...
When copper is added to a solution of silver ions, the following equilibrium is established. Cu(s) + 2Ag⁺(aq) ⇌ Cu²⁺(aq) + 2Ag(s) Kᶜ = 1.0 × 10⁵ Wh...
X, Y and Z are elements in Period 3 of the Periodic Table. The results of some experiments carried out with compounds of these elements are shown. ...
A solid Period 3 element, Q, is reacted with oxygen gas. Compound R is formed. When R is added to water the pH decreases. What could be the empiric...
Metal T reacts with water to produce a colourless solution. A white precipitate is produced when this colourless solution is mixed with aqueous sul...
When calcium nitrate thermally decomposes, oxygen is one of the products. Which volume of oxygen is produced under room conditions when 0.50 mol of...
L, M and N are Group 2 metals. L reacts more vigorously with dilute hydrochloric acid than N does. M(OH)₂ is more soluble than N(OH)₂. What could b...
The table shows some reactions of a white compound, G. [Figure 17.1] What could be the identity of G?
Under standard conditions, which statement is correct?
Ammonia, NH₃, and hydrazine, NH₂NH₂, are two compounds of nitrogen, N₂. Which statement is correct?
How many structural isomers are there of trichloropropane, C₃H₅Cl₃?
Compound L has the molecular formula C₁₀H₁₆. A sample of L reacted with an excess of hot, concentrated, acidified potassium manganate(VII). Compoun...
Many reactions take place in the engine and catalytic converter of a car. Which pair of substances is produced both by the reactions in a car engin...
Structural isomerism and stereoisomerism should be considered when answering this question. 2-bromopentane is heated with an excess of ethanolic so...
Bromopropane reacts with water as shown. CH₃CH₂CH₂Br + H₂O → CH₃CH₂CH₂OH + HBr Which statement is correct?
Which product is formed when 3-methylpentane-1,3,4-triol is heated under reflux with an excess of acidified potassium dichromate(VI)?
Menthol is a naturally occurring alcohol. [Figure 26.1] When menthol is heated with concentrated sulfuric acid it reacts. The products formed inclu...
Structural isomerism only should be considered when answering this question. All the isomeric alcohols with the molecular formula C₅H₁₂O are added ...
When compound X is heated with Cr₂O₇²⁻/H⁺, a colour change from orange to green is observed. Two tests are carried out on the organic product of th...
1 mole of each of the following four compounds is reacted separately with: • an excess of sodium • an excess of sodium carbonate. Which compound pr...
An infra-red spectrum shows a broad peak at 3000 cm⁻¹ and a strong peak at 1710 cm⁻¹. Which substance could have produced this spectrum?
In an experiment, 10 cm³ of an organic compound, J, in the gaseous state is reacted with an excess of oxygen. Steam, 20 cm³ of carbon dioxide and 5...
In which pairs do both species have the same number of unpaired electrons in p orbitals? 1 O and Cl⁺ 2 F⁺ and Ga 3 N and Kr³⁺
In which reactions is the underlined element or compound reduced? 1 NaClO + H₂O₂ → O₂ + NaCl + H₂O 2 2NH₃ + 2Li → 2LiNH₂ + H₂ 3 3CH₃CH₂OH + K₂Cr₂O₇...
Some polluting gases are removed from car exhaust fumes using a catalytic converter. Platinum or palladium can be used as the catalyst. The reactio...
Which statements about ceramics are correct? 1 Ceramics are good electrical conductors. 2 Ceramics are strong materials. 3 Ceramics have high melti...
Which types of bonding are present in ammonium carbonate, (NH₄)₂CO₃? 1 ionic 2 covalent 3 co-ordinate (dative covalent)
The diagram shows the structure of cholesterol. [Figure 37.1] Which statements about cholesterol are correct? 1 The molecule contains a secondary a...
The compounds listed are reacted with hydrogen cyanide. Which compounds produce a molecule containing a chiral centre? 1 butanal 2 butanone 3 penta...
Carboxylic acids can be prepared from alcohols, nitriles or esters. Which statements are correct? 1 Both primary and secondary alcohols can be oxid...
Nitrogen, N2, is the most abundant gas in the Earth's atmosphere and is very unreactive.
The elements in Group 17 of the Periodic Table are called the halogens. They form stable compounds with both metals and non-metals. The table gives...
Several ores of copper contain both copper(II) carbonate and copper(II) hydroxide. This combination is called basic copper(II) carbonate. You will ...
It is possible that ores containing basic copper(II) carbonate also contain water of crystallisation. The formula of these ores would be written as...
State one natural and one man-made occurrence of oxides of nitrogen.
The following table lists the solubilities of the hydroxides and carbonates of some of the Group 2 elements, M, at 25 °C. solubility/mol dm⁻³ eleme...
Use mathematical expressions to define the following terms. • pH = • Ka for a weak acid, HA =
Complete the electronic configuration of a copper atom. 1s²2s²2p⁶
Methyl 2-cyanoprop-2-enoate, W, is the major component of Super Glue, a rapid-setting adhesive. As the adhesive sets, the monomer W polymerises. [F...
The names of many drugs used in medicine often include parts of the names of the functional groups their molecules contain.
Ethanedioyl dichloride, ClCOCOCl, is a useful reagent in organic synthesis. It can be made from compound A in one step. [Figure 7.1] Ethanedioyl di...
The reaction between hydrogen peroxide, H2O2(aq), and iodide ions, I-(aq), takes place in acidic conditions. H2O2(aq) + 2I-(aq) + 2H+(aq) → I₂(aq) ...
A student was given a sample of an unknown Group 2 chloride. The student dissolved 3.172g of the unknown Group 2 chloride in distilled water in a b...