Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
1,1-dichloropropane reacts with aqueous sodium hydroxide in a series of steps to give propanal. CH3CH2CHCl2 --NaOH(aq)--> CH3CH2CHO Which term desc...
The ester CH3CH2CH2CO2CH3 is responsible for the aroma of apples. When this ester is hydrolysed by acid in the stomach, what is the empirical formu...
This question should be answered by considering the reactions of KMnO4 with different functional groups under the stated conditions. The diagram sh...
Which reaction would not give ethanoic acid as a product?
Solid calcium carbonate is added to 100 cm³ of dilute hydrochloric acid and the rate of the reaction is measured. 100 cm³ of distilled water is the...
Which equations apply to an ideal gas? [p = pressure, V = volume, M = molar mass, ρ = density, c = concentration, R = gas constant, T = temperature...
What is involved when a hydrogen bond is formed between two molecules? 1 a hydrogen atom bonded to an atom less electronegative than itself 2 a lon...
When the yellow liquid NCl3 is stirred into aqueous sodium hydroxide, the reaction that occurs can be represented by the following equation. 2NCl3(...
In a car engine pollutant oxide Y, which contains non-metallic element X, is formed. Further oxidation of Y to Z occurs in the atmosphere. In this ...
Which compounds can be obtained from ethene in a single reaction? 1 CH3CH3 2 CH2CH2 3 HOCH2CH2OH
Which compounds when heated under reflux with an excess of hot acidified potassium dichromate(VI), give a product with a chiral centre? 1 CH3CH2CCH...
In the reaction between an aldehyde and HCN, catalysed by NaCN, which statements about the reaction mechanism are correct? 1 A new carbon-carbon bo...
An organic compound, X, will react with an excess of calcium metal to produce a salt with the empirical formula CaC4H6O4. What could be the identit...
The molecular energy distribution curve represents the variation in energy of the molecules of a gas at room temperature. [Figure 1.1] Which curve ...
In which species are the numbers of protons, neutrons and electrons all different?
What is the most likely shape of a molecule of hydrazine, N2H4?
In which species does the underlined atom have an incomplete outer shell?
Which solid contains more than one kind of bonding?
Use of the Data Booklet is relevant to this question. The gas laws can be summarised in the ideal gas equation. pV = nRT 0.96 g of oxygen gas is co...
Two moles of compound P were placed in a vessel. The vessel was heated and compound P was partly decomposed to produce Q and R. A dynamic equilibri...
The value of the third ionisation energy of aluminium is 2740 kJ mol⁻¹. Which correctly represents this statement?
Methanol is manufactured by reacting carbon dioxide and hydrogen. CO2(g) + 3H2(g) ⇌ CH3OH(g) + H2O(g) ∆H = −49 kJ mol⁻¹ What would increase the equ...
Which molecule has the largest overall dipole?
In which substance does nitrogen exhibit the highest oxidation state?
Red lead oxide, Pb3O4, is used in metal priming paints. It can be made by heating PbO in air. 6PbO(s) + O2(g) → 2Pb3O4(s) Which two values are need...
Which gas is present in the exhaust fumes of a car engine in a much greater amount than any other gas?
Slaked lime, Ca(OH)2, may be made from limestone, CaCO3. On heating in a lime kiln at 1000°C, limestone decomposes as follows. reaction 1 CaCO3(s) ...
The period 4 elements gallium (Ga), germanium (Ge), arsenic (As) and selenium (Se) are the elements below aluminium, silicon, phosphorus and sulfur...
Chlorine shows oxidation states ranging from −1 to +7 in its compounds. What are the reagent(s) and conditions necessary for the oxidation of eleme...
What can be seen when a piece of magnesium ribbon is placed in cold water?
Use of the Data Booklet is relevant to this question. Sodium and sulfur react together to form sodium sulfide, Na2S. How do the atomic radius and i...
Which substance does not produce a poisonous gas, when burnt in a limited amount of air?
Use of the Data Booklet is relevant to this question. A sample of propyl ethanoate is hydrolysed by heating under reflux with aqueous sodium hydrox...
Which diagram gives the skeletal formula of 2-chloropentan-3-ol?
When 1-bromopropane is treated in succession with two reagents, X and Y, it produces propanoic acid. What are reagents X and Y?
Isomers X and Y both react with HBr. [Figure 23.1] A mixture of X and Y is reacted with HBr. Which three structures represent three different possi...
Oct-1-ene, CH3(CH2)5CH=CH2, is subjected to thermal cracking. Which combination of compounds W, X, Y and Z can be obtained? CH2=CH2 W CH3CH=CH2 X C...
When phenacyl chloride, C6H5COCH2Cl, is reacted with aqueous NaOH, the substitution reaction follows an SN2 mechanism. Which structure represents a...
Complete combustion of compound X gives carbon dioxide and water only. A sample of X is mixed with aqueous potassium(V) dichromate and boiled under...
A compound Y has the following properties. • It is a liquid at room temperature and atmospheric pressure. • It does not mix completely with water. ...
Coniine is the major constituent of the poison 'oil of hemlock'. [Figure 28.1] Coniine can be synthesised by reacting ammonia with a dibromo compou...
A common industrial solvent is a mixture of propanone, CH3COCH3, and pentyl ethanoate CH3CO2(CH2)4CH3. Which reagent would have no reaction with th...
An organic compound will decolorise dilute acidified aqueous potassium manganate(VII) on warming, but will not decolorise bromine water. What could...
Which of the following molecules and ions have a regular trigonal planar shape?
Ammonia and chlorine react in the gas phase. 8NH3 + 3Cl2 → N2 + 6NH4Cl Which statements are correct?
Concentrated sulfuric acid behaves as a strong acid when it reacts with water. H2SO4(l) + aq → H+(aq) + HSO4⁻(aq) The HSO4⁻ ion formed behaves as a...
Silver chloride dissolves in aqueous ammonia. What happens in this process?
Compared with the HCl molecule, the bond .....X..... of the HBr molecule is .....Y...... Which pairs of words correctly complete the above sentence?
Which statements are true about the Haber process for the manufacture of ammonia?
Which compounds can be obtained from propene in a single reaction?