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.
Which compound contains 45.2% nitrogen by mass? [Ar: C, 12; H, 1; N, 14]
What is a chemical product of a hydrogen–oxygen fuel cell?
Hydrogen can be produced by reacting methane with steam. CH4 + 2H2O → CO2 + 4H2 Using the bond energies in the table, what is the enthalpy change o...
What is the best way of slowing down the reaction between magnesium and sulfuric acid?
The volume of gas produced by the reaction of 100cm³ of hydrochloric acid with an excess of calcium carbonate is measured in two experiments. The v...
Hydrogen is made industrially by the reaction shown. CO(g) + H2O(g) ⇌ CO2(g) + H2(g) ΔH = –41 kJ/mol Statements about this industrial process are g...
The table refers to two important industrial gaseous reactions. Which catalysts are correctly stated?
Iron(II) ions react with chlorine. 2Fe²⁺(aq) + Cl2(g) → 2Fe³⁺(aq) + 2Cl⁻(aq) Which statement about this reaction is correct?
Which reagent and observation describes the test for a reducing agent?
Compound X is a gas at room temperature. X dissolves in water to give a solution with a pH of 4. Which statement about compound X is correct?
Which statement about hydrochloric acid is correct?
The addition of calcium hydroxide to soil reduces its acidity but also reduces the efficiency of fertilisers. Which two equations explain this? 1 C...
Which anions are contained in salts that are always soluble in water?
The element phosphorus, P, is immediately below nitrogen in the Periodic Table. It forms an oxide with the empirical formula P2O5. From the positio...
The table shows some properties of transition elements and the reasons why they have these properties. Which row shows a correct property and the r...
Which equation is correct?
Metal X reacts with cold water to form a gas. Zinc displaces metal Y from solutions of its salts. The carbonate of metal Z is insoluble. What could...
Which statement about alloys is correct?
Pieces of magnesium can be attached to the steel hull of a ship to prevent rusting. This is sacrificial protection. Which statements about sacrific...
Why is carbon used in water purification?
Which statement about air pollutants is correct?
What is the structural formula of propyl methanoate?
Which statement about ethane is correct?
Isoprene is an alkene which is commonly found in plants. Which properties does isoprene have? 1 It burns in air. 2 It can form polymers. 3 It decol...
The structure of an ester is shown. Which two compounds react to form this ester?
25.0 cm³ of 1.0mol/dm³ sodium hydroxide is titrated with dilute sulfuric acid, using a suitable indicator. 25.0 cm³ of the sulfuric acid is require...
The results of a paper chromatography experiment are shown. X is an aqueous solution of a salt of a Group I element. Y is an aqueous solution of a ...
Aqueous sodium hydroxide is used to identify the ions present in aqueous solutions of compounds Q and R. The results are shown. Which row is correct?
Choose from the following oxides to answer the questions. Al2O3 CO CO2 CaO Fe2O3 H₂O Na₂O SO2 SiO2 Each oxide may be used once, more than once or n...
Group I includes the elements lithium, sodium and potassium.
This question is about the preparation of salts.
This question is about compounds that contain phosphorus.
Ammonium chloride decomposes when heated to make hydrogen chloride and ammonia. This reaction is reversible. The forward reaction absorbs thermal e...
This question is about the energy changes that take place during chemical reactions.
Methanol, propan-1-ol and propan-2-ol are alcohols. The displayed formulae of methanol and propan-1-ol are shown in Fig. 7.1. [Figure 7.1 showing m...
This question is about electrolysis.
Oxides of nitrogen such as nitrogen monoxide, NO, are atmospheric pollutants. The exhaust gas from a car engine contains 0.00200% by volume of nitr...
PVC and poly(propene) are polymers made by a reaction called addition polymerisation.
Choose from the following oxides to answer the questions. CO CO2 CaO CuO Fe2O3 H₂O SO2 SiO2 ZnO Each oxide may be used once, more than once or not ...
Group VII includes the elements fluorine, chlorine, bromine and iodine.
This question is about compounds that contain magnesium and nitrogen.
Carbon reacts with steam to make carbon monoxide and hydrogen. This reaction is reversible. The forward reaction absorbs thermal energy. C(s) + H₂O...
This question is about the energy changes that take place during chemical reactions. (a) Nitrogen reacts with oxygen to make nitrogen monoxide. The...
Ethene, but-1-ene and but-2-ene are alkenes. The displayed formulae of ethene and but-1-ene are shown in Fig. 7.1. [Figure 7.1]
A sample of clean, dry air contains 0.0400% carbon dioxide by volume.
Proteins and PET are polymers made by a reaction called condensation polymerisation.
White vinegar is a colourless solution containing ethanoic acid. You are provided with two samples of white vinegar labelled A and B. You are going...
You are provided with solution W and solid X. Do the following tests recording all of your observations at each stage. Tests on solution W
You are not expected to do any experimental work for this question. Baking powder is used to make cakes rise. When water is added to baking powder,...
Aqueous ammonia is a solution of ammonia gas. You are provided with two samples of aqueous ammonia labelled A and B. You are going to investigate t...