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.
X is either chlorine or an oxide of chlorine. X reacts with water, under suitable conditions, to form the two acids HCl and HClO3 in the mole ratio...
Ethyl ethanoate undergoes the following reaction. CH3CO2C2H5 + H2O ⇌ C2H5OH + CH3CO2H Kс = 0.27 Equal amounts of ethanoic acid and ethanol were mix...
Which row is an example of heterogeneous catalysis? reaction catalyst A esterification sulfuric acid B the Contact process divanadium pentoxide C d...
Element Q readily oxidises in air. The oxide produced reacts with water to form a solution of very low pH. Where could element Q be found in the Pe...
The eight elements sodium to argon are in the same period of the Periodic Table. The equation corresponding to the first ionisation energy is shown...
Elements D and E are both in Period 3. Element D has the smallest atomic radius in Period 3. There are only two elements in Period 3 which have a l...
How many of the solutions shown, when added to separate portions of magnesium sulfate solution, produce a white precipitate? HCl(aq) NH3(aq) (NH4)2...
A white solid, Z, is soluble in water. A sample of Z is heated with a Bunsen burner until there is no further change. When the residue is shaken wi...
Ammonium sulfate, (NH4)2SO4, and ammonium nitrate, NH4NO3, are used as fertilisers. These salts have different percentages by mass of nitrogen. The...
Which reaction gives a product that is an atmospheric pollutant causing acid rain?
3-methylbut-1-ene can undergo different types of reaction. [Figure 20.1] Which row correctly identifies the reaction types? reaction 1 reaction 2 A...
Compound X does not show cis-trans isomerism. What could be the identity of compound X?
The diagram shows the repeat unit of an addition polymer. [Figure 22.1] What is the correct name for the monomer that would form this polymer?
A molecule of geraniol is shown. [Figure 23.1] What is formed when geraniol is reacted with an excess of cold, dilute, acidified manganate(VII) ions?
Alcohol W cannot be made by reducing a carboxylic acid with LiAlH4. Alcohol W gives only one product when dehydrated with concentrated sulfuric aci...
Which product can be made from bromoethane by an elimination reaction?
Propene, bromine and hydrogen bromide are mixed in the dark. A number of products are formed, some in very small quantities. Which substance will n...
Which reagent could be used to distinguish between ethanal and propanal?
The diagram shows that a carboxylic acid P may be formed from X, Y or Z. [Figure 28.1] Which row is correct? alcohol X is the change in Mᵣ is great...
One molecule of compound R is shown. [Figure 29.1] What is the name of compound R and how does its boiling point compare with that of butanoic acid?
The diagram shows the infra-red spectrum of Q. [Figure 30.1] What could be Q?
When O2 reacts with H2S the products are SO2 and H2O. Mixture Y contains an equal number of the two molecules shown, and no other molecules. [Figur...
Which statements about an atom of ⁹⁹Tc are correct?
In which reactions are nitrogen atoms reduced?
The manufacture of ammonia from nitrogen and hydrogen is an important industrial process. Which of the following would leave the equilibrium consta...
Which reactions involving calcium and its compounds produce two gaseous products?
A small quantity of hot, concentrated sulfuric acid is added separately to solid samples of potassium halides, KX. Which potassium halides react an...
The diagram shows a compound used as a flame retardant. [Figure 37.1] Which statements about this structure are correct?
Halogenoalkanes can be hydrolysed using aqueous sodium hydroxide. Which compounds tend to be hydrolysed by an Sɴ1 mechanism?
In an organic synthesis, a 62% yield of product is achieved. Which conversions are consistent with this information?
An oxidising agent that can oxidise ethanal to ethanoic acid or ethanoate ions will also oxidise methanoic acid, HCO2H, to carbon dioxide and water...
Group 2 elements share common chemical properties.
Magnesium silicide, Mg₂Si, is a compound made by heating magnesium with sand.
Construct an equation for the second ionisation energy of argon.
The structure of compound Y is shown. [Figure Y.Y]
Ethanal reacts with a mixture of HCN and NaCN to make 2-hydroxypropanenitrile, CH3CH(OH)CN. The reaction mechanism is nucleophilic addition.
Methylpropane, (CH3)2CHCH3, is an isomer of butane, CH3(CH2)2CH3.
Group 17 elements are commonly referred to as the halogens.
Period 3 elements react with chlorine gas, Cl₂(g), to form chlorides. (a) The table shows the differences in observations which occur when two Peri...
There are many different types of aliphatic and aromatic hydrocarbons.
Many naturally occurring esters are used as flavourings in food. (a) The structure of ester V is shown. [Figure of ester V: CH₃COOCH₂CH₂CH₃]
(a) A sample contains three different types of atom: 48Ar, 49K and Ca. (i) State fully, in terms of the numbers of subatomic particles, what these ...
Iodine is an element in Group 17 of the Periodic Table. (a) (i) At room temperature, iodine solid has a lattice structure. Describe the arrangement...
(a) Magnesium reacts with oxygen to form magnesium oxide. State two observations that would be made when magnesium is heated strongly and placed in...
Release of sulfur dioxide, SO2, into the atmosphere causes acid rain. (a) Explain why high levels of SO₂ may be found in the atmosphere near power ...
Halogenoalkanes react with a number of different reagents in nucleophilic substitution reactions. (a) A sample of potassium cyanide dissolved in et...
(a) Three alkenes, X, Y and Z, have the same molecular formula. (i) Describe what is seen when aqueous bromine is added to X. [1] X, Y and Z are ...
Metal carbonates react with acid to produce carbon dioxide. You will determine the identity of a Group 2 metal M in a carbonate of formula MCO3 by ...
In Question 1 you measured the volume of carbon dioxide produced by a metal carbonate, MCO3, in order to identify M. In Question 2 you will identif...
Amidosulfonic acid is a monoprotic acid with the formula HSOxNH2. In this experiment you will determine the value of x in the formula by titration ...