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.
Rubidium and bromine form ions that are isoelectronic. Each ion has 36 electrons. Which row is correct?
In which set do all the molecules have all their atoms arranged in one plane?
Exactly 1.00 g of a metallic element reacts completely with 300 cm³ of oxygen at 298 K and 1 atm pressure to form an oxide which contains O²⁻ ions....
Ammonium metavanadate, NH4VO3, can be used to make a solution containing VO2Cl, which contains chloride ions. What is the change in the oxidation n...
In this question, all pressures are measured in atm. The equation represents the equilibrium between three gaseous substances X, Y and Z. X + 3Y ⇋ ...
In a chemical system the particles involved have a range of energies. This can be shown on a graph called the Boltzmann distribution. Which stateme...
Nitrogen and hydrogen can react together to form ammonia. The formation of ammonia is exothermic. The rate and yield of the reaction can be altered...
The melting points of the Period 3 elements phosphorus to argon are shown in the table. Which factor explains the changes in melting points from ph...
Which observations are made when a sample of silicon chloride, SiCl4, is added to a beaker of water?
A 4.00 g sample of an anhydrous Group 2 metal nitrate is heated strongly until there is no further change. A solid residue of mass 1.37 g is formed...
In which row are all statements comparing magnesium and barium correct?
Which statement about the halogens is correct?
Chlorine reacts with both hot and cold sodium hydroxide to form products containing chlorine. Cold sodium hydroxide forms sodium chlorate(X) and ho...
If ammonium cyanate is heated in the absence of air, the only product of the reaction is urea, CO(NH2)2. No other products are formed in the reacti...
There are three structural isomers with the formula C5H12. Which formulae correctly represent these three structural isomers?
The diagram shows a molecule that has σ bonds and π bonds. [Figure of CH2=CH-CH2—C—O—CH2—CH=CH2] How many σ bonds are present in this molecule?
Polyethene is made by the polymerisation of ethene. Which statement is correct?
Compound P reacts separately with KOH(aq) and HBr. CH2CHCH2CH2Cl compound P What are the mechanisms of these two reactions?
Which statement about compound Q is correct? CH3C=CHCH2CH3 CO2CH3 Q
A halogenoalkane has the molecular formula C5H11Br. The halogenoalkane does not form an alkene when treated with ethanolic sodium hydroxide. What c...
The reactions of four organic compounds are given in the table. Which compound could be propan-2-ol?
Compound X has the empirical formula C2H3O. Compound X reacts with 2,4-dinitrophenylhydrazine reagent to give an orange precipitate and also decolo...
Compound Y gives methanol and sodium ethanoate on treatment with aqueous sodium hydroxide. What is the structure of Y?
Which compound can be used to make propanoic acid by treatment with a single reagent?
The infra-red spectrum of compound L is shown. [Figure X.X] What could be the structure of L?
Zinc reacts with hydrochloric acid according to the following equation. Zn + 2HCl → ZnCl2 + H2 Which statements are correct? 1 A 3.27 g sample of z...
The melting point of chlorine is lower than the melting point of iodine. Which statements help to explain this difference? 1 Iodine has more electr...
Aqueous iron(II) sulfate can take part in redox reactions. 6FeSO4 + 7H2SO4 + Na2Cr2O7 → 3Fe2(SO4)3 + Cr2(SO4)3 + Na2SO4 + 7H2O Which redox changes ...
The equation represents an equilibrium. 4NH3(g) + 5O2(g) ⇋ 4NO(g) + 6H2O(g) ΔH = –900 kJ mol⁻¹ What would increase the concentration of NO at equil...
A sample containing x mol of Al2Cl6 is dissolved in water to give solution W. In order to precipitate all of the aluminium as its hydroxide, y mol ...
Which statements concerning calcium hydroxide are correct? 1 It is less soluble in water than strontium hydroxide. 2 When it is added to water an a...
Which bromopropenes would react with cold bromine in the dark to form a product containing a chiral carbon atom? 1 CHBr=CHCH3 2 CH2=CHCH2Br 3 CH2=C...
Halogenoalkanes can undergo reaction with hydroxide ions. RBr + OH⁻ → ROH + Br⁻ The reaction of some halogenoalkanes proceeds by the SN1 mechanism....
Which statements about 2-methylbutan-1-ol are correct? 1 It can give HCl(g) on reaction with PCl5. 2 It can be oxidised to give an aldehyde. 3 It d...
The compound cis-hex-3-enal is responsible for the characteristic smell of cut grass. [Figure of cis-hex-3-enal structure] cis-hex-3-enal Which rea...
Iron pyrite, FeS2, has a yellow colour that makes it look like gold metal. The compound contains the ions Fe2+ and S22-.
Nitrogen, N2, is an inert gas that makes up 78% of the Earth's atmosphere. Explain why nitrogen is inert.
Trihalomethanes are organic molecules in which three of the hydrogen atoms of methane are replaced by halogen atoms, for example CHCl3.
The structure of glycolic acid is shown. [Figure 4.0 - Structure of glycolic acid: H-C(H)(OH)-COOH] OH glycolic acid
The model of the nuclear atom was first proposed by Ernest Rutherford. He developed this model on the basis of results obtained from an experiment ...
The table gives some data for elements in the third period and some of their compounds. element Na Mg Al Si P ...
The diagram shows a reaction sequence starting from ethanal. [Figure showing reaction sequence from ethanal to P, Q, R, S, W, Z, T and 2-aminopropane]
The structure of glycolic acid is shown. [Figure showing the structure of glycolic acid, HO-CH2-COOH]. glycolic acid
In this experiment you will determine the percentage purity of a sample of impure anhydrous sodium carbonate. You will use two different methods to...
Qualitative Analysis Where reagents are selected for use in a test, the full name or correct formula of the element or compound must be given. At...
2 In this experiment you will determine the enthalpy change, ΔH, for the reaction between aqueous copper(II) sulfate and zinc. The zinc is in exces...
Qualitative Analysis Where reagents are selected for use in a test, the full name or correct formula of the element or compound must be given. At e...
An aldehyde, an alkane and a carboxylic acid, all of similar volatility, are mixed together. The mixture is then analysed in a gas chromatograph. T...
Ethanedioate ions, C2O4²⁻, are bidentate ligands. Cr³⁺(aq) and C2O4²⁻(aq) ions form the complex ion [Cr(C2O4)2(H2O)2]⁻. The solubility of calcium e...
The reaction scheme shows some reactions of [Cu(H2O)6]²⁺. [Figure showing reaction scheme: [Cu(H2O)6]²⁺ reacts with NaOH(aq) to form precipitate A ...