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.
In which substance is the average oxidation number of sulfur the highest?
An equilibrium can be represented by the equation shown. P(aq) + Q(aq) ⇌ 2R(aq) + S(aq) In a certain mixture, of volume 1.0 dm³, the equilibrium co...
In the Contact process, sulfur dioxide and oxygen react to form sulfur trioxide. In the Haber process, nitrogen and hydrogen react to form ammonia....
20.0 cm³ of hydrogen peroxide decomposes to water and oxygen in the presence of a suitable catalyst. 160 cm³ of oxygen, measured at room conditions...
Which reaction pathway diagram shows an endothermic reaction that occurs in two steps and in which the second step of the reaction is likely to be ...
Oxides of nitrogen, NOx, are involved in formation of photochemical smog and acid rain. Which oxides of nitrogen are involved in each of these proc...
Sodium and sulfur react together to form sodium sulfide, Na2S. How do the atomic radius and ionic radius of sodium compare with those of sulfur?
Compound X is an oxide of a Period 3 element. Compound X is a white solid at 25 °C. It reacts with water to form an acidic solution. What is compou...
R is the aqueous solution of an ionic compound. • A white precipitate is formed when R is added to Sr(NO3)2(aq). • No visible reaction is seen when...
In an experiment, 0.600 mol of chlorine gas, Cl2, is reacted with an excess of hot aqueous sodium hydroxide. One of the products is NaClO3. Which m...
X and Y are sodium salts of Group 17 elements. When X reacts with concentrated sulfuric acid, hydrogen sulfide, H2S, is produced. When Y reacts wit...
Element E is in Period 3. It forms a chloride which reacts with a small amount of water to produce a white precipitate and steamy fumes. This preci...
Four reaction mixtures are listed. 1 (NH4)2SO4(aq) and NaOH 2 NH4Cl(aq) and Ba(OH)2 3 NH4Cl(aq) and Na2O 4 (NH4)3PO4(aq) and HCl Which reaction mix...
Two statements about a molecule of methanal are given. 1 It is planar. 2 It contains three σ bonds. Which statements are correct?
The structure of disodium cromoglycate is shown. [Figure 26] How many chiral centres are there in this molecule?
What is the major product when 2-methylpent-2-ene reacts with hydrogen bromide?
Pent-2-ene is reacted with cold, dilute, acidified manganate(VII) ions. What is the major product?
Limonene is an oil formed in the peel of citrus fruits. [Figure 29: Limonene structure] Which product is formed when an excess of bromine, Br2(I), ...
Which reaction mixture produces a nitrile?
Which reaction is classified as SN1?
Which reaction mixture produces a primary alcohol as the major product?
HOCH2CHO is heated under reflux with an excess of acidified K2Cr2O7 until there is no further reaction. What is the final product of this reaction?
An organometallic lithium compound, RLi, contains the nucleophile R⁻. CH3CH2Li reacts with pentan-2-one. The mechanism is nucleophilic addition. Th...
The structure of a naturally occurring compound, Q, is shown. [Figure 35: Compound Q structure] Compound Q is heated under reflux with an excess of...
Which organic starting material could be used in a single reaction to produce propanoic acid?
In four separate reactions, W, X, Y and Z, 1 mol of an organic compound reacts with an excess of a reagent. [Figure 37: Table of organic compounds ...
Butylamine can be produced by the reaction of butanenitrile with hydrogen in the presence of a suitable catalyst. Which volume of hydrogen, measure...
A section of an addition polymer is shown. [Figure 39: Polymer structure] Which monomer is used to make this polymer?
The purity of a compound can be determined using infrared spectroscopy. The table gives the characteristic infrared absorption frequencies for some...
Chromium, Cr, and its compounds are widely used in many chemical reactions.
The Period 3 elements show trends in physical and chemical properties across the period. Fig. 2.1 shows the variation in atomic and ionic radii of ...
Cycloalkanes show similar chemical properties to alkanes but have the same empirical formula as alkenes.
Fig. 4.1 shows a possible synthesis of propene, C₃H₆. [Figure 4.1]
Manganese, Mn, and its compounds are widely used in many chemical reactions.
The Period 3 elements show trends in physical and chemical properties across the period.
The alkanes are a homologous series of organic molecules. Alkanes are generally unreactive and are commonly used as fuels.
Fig. 4.1 shows how propane, C₃H₈, can be converted to propanoic acid, CH₃CH₂COOH. [Figure 4.1]
The Period 3 elements show trends in physical and chemical properties across the period. (a) Fig. 2.1 shows the variation in atomic and ionic radii...
[Figure 4.1] shows a possible synthesis of propene, C₃H₆.
Hydrated ethanedioic acid is a diprotic acid with the formula (COOH)2•xH2O where x is an integer. Ethanedioic acid reacts with manganate(VII) ions ...
Hydrated zinc sulfate has the formula ZnSO4•yH2O where y is an integer. Hydrated zinc sulfate decomposes when heated, losing only its water of crys...
When hydrated sodium thiosulfate is dissolved in water the temperature of the liquid changes. You will carry out an experiment to determine the ent...
Solutions of Group 2 hydrogencarbonates, M(HCO3)2, decompose on heating to give the corresponding metal carbonate, carbon dioxide and water.
Iron can form stable ions in the +2 and +3 oxidation states.
Solid manganese(IV) oxide, MnO2, catalyses the decomposition of hydrogen peroxide. 2H2O2(aq) → 2H2O(l) + O2(g)
Define standard cell potential, E°cell. Include a description of standard conditions.
Copper shows typical properties of transition elements, including its behaviour as a catalyst.
Thin-layer and gas/liquid chromatography can be used to separate mixtures into their individual components. Define the following terms used in chro...
State the relative acidities of bromoethanoic acid, BrCH2COOH, chloroethanoic acid, ClCH2COOH, ethanoic acid, CH3COOH and ethanol, CH3CH2OH. Explai...
In the electrophilic substitution of arenes, different substituents can direct to different ring positions. Describe the directing effect of the –N...