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.
The diagram shows the structure of progesterone. Which statement about progesterone is correct?
A molecule of hexane can be cracked in a number of different ways. Three compounds are listed. 1 C3H8 2 C4H8 3 C5H12 Which compounds are found in t...
The diagrams show the structures of two isomeric dicarboxylic acids, X and Y. X can be reduced to compound P with empirical formula C2H5O. Y can be...
What is the total number of sp³ hybridised atomic orbitals used in the bonding of but-2-ene?
Compound L contains carbon atoms. It is analysed in a mass spectrometer. The table shows the relative abundance of the only two peaks recorded with...
Phosphorus and chlorine are elements in Period 3 of the Periodic Table.
The Group 2 elements show metallic bonding.
The halogens chlorine, bromine and iodine show trends in chemical and physical properties down the group. Table 3.1 shows some properties of chlori...
[Figure 4.1] shows compounds J to M, each of which contains four carbon atoms. J: [Figure 4.1 shows CH3CH2CH2CHO] K: [Figure 4.1 shows CH3CH2COCH3]...
2 Many oxidising agents are able to oxidise acidified potassium iodide to iodine in acidic conditions. The amount of iodine produced can be determi...
Silver, Ag, is a metal in the d-block of the Periodic Table.
Propanone, CH3COCH3, is a common organic solvent and reagent.
Fe2+ and Fe3+ ions are able to form a variety of complexes with different species.
State the difference in the basicities of ammonia, NH3, propanamide, CH3CH2CONH2, and propylamine, CH3CH2CH2NH2. Explain your answer. weakest base ...
Cumene is an aromatic hydrocarbon used in the synthesis of other useful chemicals.
Maleic anhydride is an unsaturated cyclic compound used in the formation of several polymers. Maleic anhydride can be used to form maleic acid and ...
Brass is an alloy of copper and zinc. An experiment is completed to find the percentage by mass of copper in a sample of brass. In the experiment, ...
Ester X has the formula CH3COOR. R is an alkyl group with the general formula CnH2n+1. Ester X undergoes alkaline hydrolysis with aqueous potassium...
Which gas closely approaches ideal behaviour at room temperature and pressure?
Use of the Data Booklet is relevant to this question. What could be the proton number of an element that has three unpaired electrons in each of it...
Use of the Data Booklet is relevant to this question. The elements radon (Rn), francium (Fr) and radium (Ra) have consecutive proton numbers in the...
Some bond energy values are listed below. bond bond energy/kJ mol⁻¹ C-H 410 C-Cl 340 Cl-Cl ...
Given the following enthalpy changes, I2(g) + 3Cl2(g) → 2ICl3(s) ΔΗ° = −214 kJ mol⁻¹ I2(s) → I2(g) ∆H = +38 kJ mol⁻¹ What is the standard enthalpy ...
Ammonium nitrate, NH4NO3, can decompose explosively when heated. ΝΗ4ΝΟ3 → N2O + 2H2O What are the changes in the oxidation numbers of the two nitro...
Which mass of gas would occupy a volume of 3 dm³ at 25 °C and 1 atmosphere pressure? [1 mol of gas occupies 24 dm³ at 25 °C and 1 atmosphere pressu...
Use of the Data Booklet is relevant to this question. 2.920 g of a Group II metal, X, reacts with an excess of chlorine to form 5.287 g of a compou...
The table gives the concentrations and pH values of the aqueous solutions of two compounds, X and Y. Either compound could be an acid or a base. X ...
The Haber process for the manufacture of ammonia is represented by the following equation. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔΗ = −92 kJ mol⁻¹ Which stateme...
The percentage of ammonia obtainable, if equilibrium were established during the Haber process, is plotted against the operating pressure for two t...
Swimming pool water can be kept free of harmful bacteria by adding aqueous sodium chlorate(I), NaOCl. This reacts with water to produce HOCl molecu...
Na2S2O3 reacts with dilute HCl to give a pale yellow precipitate. If 1 cm³ of 0.1 mol dm⁻³ HCl is added to 10 cm³ of 0.02 mol dm⁻³ Na2S2O3 the prec...
X is a salt of one of the halogens chlorine, bromine, iodine, or astatine (proton number 85). The reaction scheme shows a series of reactions using...
Which element of the third period requires the least number of moles of oxygen for the complete combustion of 1 mol of the element?
Two properties of non-metallic elements and their atoms are as follows. property 1 has an oxide that can form a strong acid in water property 2 has...
Consecutive elements X, Y, Z are in the third period of the Periodic Table. Element Y has the highest first ionisation energy and the lowest meltin...
Which property of Group II elements (beryllium to barium) decreases with increasing atomic number?
When gaseous chemicals are transported by road or by rail they are classified as follows. flammable non-flammable poisonous Which commonly transpor...
What will react differently with the two isomeric alcohols, (CH3)3CCH2OH and (CH3)2CHCH2CH2OH?
Which reagent will give similar results with both butanone and butanal?
What is formed when propanone is refluxed with a solution of NaBH4?
Which compound is a product of the hydrolysis of CH3CO2C3H7 by boiling aqueous sodium hydroxide?
When heated with chlorine, the hydrocarbon 2,2-dimethylbutane undergoes free radical substitution. In a propagation step the free radical X• is for...
When an isomer Y of molecular formula C4H9Br undergoes hydrolysis in aqueous alkali to form an alcohol C4H9OH, the rate of reaction is found to be ...
Which isomer of C4H10O forms three alkenes on dehydration?
Which compound exhibits both cis-trans and optical isomerism?
In many countries plastic waste is collected separately and sorted. Some of this is incinerated to provide heat for power stations. Why is pvc, pol...
Polymerisation of 1,1-dichloroethene produces a dense, high melting point substance that does not allow gases to pass through. It is used as cling ...
Sodium hydrogensulfide, NaSH, is used to remove hair from animal hides. Which statements about the SH⁻ ion are correct? 1 It contains 18 electrons....
Which diagrams represent part of a giant molecular structure? [Figure 32 - Three diagrams labeled 1, 2, 3]
Which reactions are redox reactions? 1 CaBr2 + 2H2SO4 → CaSO4 + Br2 + SO2 + 2H2O 2 CaBr2 + 2H3PO4 → Ca(H2PO4)2 + 2HBr 3 CaBr2 + 2AgNO3 → Ca(NO3)2 +...