Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
Which reaction will distinguish between propan-1-ol and propan-2-ol?
Compound T has the skeletal formula shown. [Figure 32.1: compound T] Which structure is a structural isomer of compound T? [Figure 32.2: options A,...
The diagram shows a simplified structure of coenzyme Q10. [Figure 33.1: coenzyme Q10 structure] Which row describes the structure of coenzyme Q10 c...
The molecule of limonene, C10H16, contains a 6-membered ring. This is the only cyclic component in its structure. Which volume of hydrogen, at room...
1-bromopropane reacts with hot ethanolic NaOH. What is the molecular formula of the product in this reaction?
A sample of pent-2-en-4-ol, C5H10O, contains all the possible stereoisomers of this compound. How many stereoisomers are there in the sample?
Which pair of reagents reacts to form a product with a chiral carbon atom?
The diagrams show the structures of two esters, X and Y, that are formed in ripening apples. [Figure 38.1: ester X and ester Y structures] Which ca...
An addition polymer is made from monomer Z. [Figure 39.1: monomer Z structure] What is the structure of the polymer made from this monomer? [Figure...
Compound X reacts with acidified K2Cr2O7 to form compound Y. The infrared spectrum of compound Y is shown. [Figure 40.1: infrared spectrum] [Table ...
The elements of Group 17 are called halogens.
Hydrocarbon molecules contain covalent bonds.
Fig. 1.1 shows the variation in melting point of some Period 3 elements in their standard states at room temperature and pressure.
Separate samples of Na2CO3 and NaHCO3 react with HCl(aq) to produce the same products, as shown in Table 2.1. Table 2.1 reaction equation ∆H/kJ mol...
CH3(CH2)5CHBrCH3 exists as a pair of stereoisomers.
Compound W has molecular formula C4H10O. It contains only one functional group.
N2(g) reacts with H2(g) in the Haber process, as shown in reaction 1. reaction 1 N2(g) + 3H2(g) ⇌ 2NH3(g) ∆H = -x kJ mol-1 Table 2.1 shows the diff...
NH3(g) reacts with HCl(g) to produce NH4Cl(s), as shown. NH3(g) + HCl(g) → NH4Cl(s)
Sodium sulfite is oxidised when it reacts with excess iodine. Na2SO3(aq) + I2(aq) + H2O(l) → Na2SO4(aq) + 2HI(aq) The remaining iodine is then titr...
2 Iodate ions contain iodine and oxygen. They have the formula IOx⁻ where x is an integer. In this experiment you will determine the value of x in ...
3 FB 7 is an aqueous solution of a salt containing one cation and one anion, both of which are listed in the Qualitative analysis notes.
2 A sample of ammonium bromide has been accidentally mixed with another salt. A student suggests that the percentage purity of the ammonium bromide...
In aqueous solution, persulfate ions, S₂O₈²⁻, react with iodide ions, as shown in reaction 1. reaction 1 S₂O₈²⁻ + 2I⁻ → 2SO₄²⁻ + I₂ The rate of rea...
Four esters, A, B, C and D, with the molecular formula C₆H₁₂O₂ are shown in Fig. 7.1. [Figure 7.1]
Neotame is an artificial sweetener added to some foods. [Figure 8.1]
Samples of phenol, C₆H₅OH, are reacted separately with sodium and with dilute nitric acid. [Figure 9.1]
Methyl red can be synthesised as shown in Fig. 7.1. [Figure 7.1 showing the reaction scheme starting from compound P (2-nitrobenzoic acid), going t...
In aqueous solution, persulfate ions, S2O82-, react with iodide ions, as shown in reaction 1. reaction 1 S2O82- + 2I-→2SO42- + I2 The rate of react...