Cambridge & Pearson Edexcel Past Paper Questions

The formation of liquid water from hydrogen and oxygen may occur in three stages. 1 2H2(g) + O2(g) → 4H(g) + 2O(g) 2 4H(g) + 2O(g) → 2H2O(g) 3 2H2...

The equation shows the formation of sulfur trioxide in the contact process. 2SO2(g) + O2(g) ⇌ 2SO3(g) ΔH = –196 kJ/mol What would decrease the yi...

Magnesium carbonate reacts with dilute hydrochloric acid to form magnesium chloride, carbon dioxide and water. MgCO3(s) + 2HCl(aq) → MgCl2(aq) + C...

At the start of a reaction, a 1.00 dm³ solution contains 0.300 mol of ethanol. After 100 seconds the concentration of the ethanol has decreased to...

Which statement about sulfuric acid is correct? Sulfuric acid is used

Which row shows the order of increasing pH (lowest to highest) for strong acids, strong bases, weak acids and weak bases at the same concentration?...

The table shows the proton numbers of four elements. element Q R T Z proton number 9 11 17 19 Which statement is correct?

The diagram shows part of the Periodic Table. Which row about the elements W, X and Y is correct? combines with oxygen in the ratio 2:3 exists as...

Lead(II) sulfate can be made by reacting dilute sulfuric acid with which substance?

Which pair gives two uses of argon?

Which two substances are removed from the bottom of a blast furnace? 1 coke 2 iron 3 limestone 4 slag

Which row has the correct catalyst for the named process? process catalyst A contact process vanadium(V) oxide B Haber process manganese(IV) oxide...

Some metals and the compounds in their ores are shown. metal Al Ca Pb Na Fe Mg compound in their ore Al2O3 CaCO3 PbS NaCl Fe2O3 MgCO3 Which type ...

After the collapse of a river bridge, a new car was immersed in the river water for several months. When it was recovered, the parts of the car ma...

A farmer spread ammonium nitrate, a nitrogenous fertiliser, on a field. The next day he spread calcium hydroxide on the same field. This caused a l...

Which row correctly compares carbon dioxide and methane? both contain carbon both are described as a greenhouse gas both lower the pH of water whe...

Fossil fuels are used to power some internal combustion engines. Which pollutants are produced by an internal combustion engine burning fossil fue...

An ester is produced by reacting together the carboxylic acid HCO2H and the alcohol CH3CH2CH2OH. What is the name and structure of this ester? na...

The repeat unit of a polymer is shown. Which monomer would produce this polymer?

Each of compounds W, X, Y and Z is either an unbranched alkane or an unbranched alkene. W C9H18 X C9H20 Y C10H20 Z C10H22 Which two compounds und...

One mole of each alkane undergoes complete combustion. Which alkane will produce seven moles of products?

Which statement about macromolecules is correct?

An organic compound, X, has a molecular formula C4H8O2 and turns damp, blue litmus paper red. What is the structure of X?

Which polymer contains only three different elements?

The diagram shows four pieces of apparatus that are used to measure the volume of a gas or liquid. Which piece of apparatus should always be filled...

The diagrams show the structures of two forms of carbon. Which of X and Y conduct electricity?

An aqueous solution of zinc chloride is tested by adding reagents. Which observation is correct?

Which statement about the particles ₁₉F⁻, ²⁰Ne and ²³Na⁺ is correct?

The table shows some properties of four substances. Which substance is an ionic compound?

Four samples are spotted onto chromatography paper. It is known that one of these samples is pure compound Q. A separate sample of pure compound Q ...

How many of the molecules shown contain only one covalent bond? Cl₂ H₂ HCI N₂ O₂

Which statements about sulfur and its compounds are correct? 1 Sulfur is in Group VI of the Periodic Table and has six outer shell electrons. 2 In ...

50.0 cm³ of 0.10 mol/dm³ silver nitrate, AgNO₃, is added to 150.0 cm³ of 0.05 mol/dm³ sodium chloride, NaCl, in a beaker. As well as solid silver c...

Nitrogen monoxide and oxygen react to form nitrogen dioxide. 2NO(g) + O₂(g) → 2NO₂(g) What is the maximum volume of nitrogen dioxide that could be ...

Dilute sulfuric acid is electrolysed between inert electrodes. Which statements are correct? 1 Hydrogen is released at the negative electrode. 2 Ox...

Caesium, Cs, is in the same group of the Periodic Table as sodium. Which products are obtained from the electrolysis of concentrated aqueous caesiu...

The diagrams show the apparatus for the electrolysis of aqueous copper(II) sulfate. In experiment X both electrodes are inert. In experiment Y both...

The energy profile diagram for the forward direction of a reversible reaction is shown. For the reverse reaction, which row correctly shows the sig...

The formation of liquid water from hydrogen and oxygen may occur in three stages. 1 2H₂(g) + O₂(g) → 4H(g) + 2O(g) 2 4H(g) + 2O(g) → 2H₂O(g) 3 2H₂O...

In four separate experiments, 1, 2, 3 and 4, nitric acid was added to excess marble chips and the volume of carbon dioxide formed was measured. In ...

The equation shows the formation of sulfur trioxide in the contact process. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ΔH = –196 kJ/mol What would decrease the yiel...

Zinc reacts with dilute sulfuric acid. Zn + H₂SO₄ → ZnSO₄ + H₂ From this equation, what can be deduced about the reaction?

Consider the three reactions. 1 reaction between ammonium chloride and calcium hydroxide 2 ethane burning in air 3 reaction between ethanoic acid a...

Which statement about weak acids is correct?

Which gas dissolves in water to give a solution with a pH greater than 7?

Element X forms an oxide of formula X₂O₅. In which group of the Periodic Table is X likely to be found?

Element M is a typical transition metal. Which property will it not have?

An atom of element E forms a white oxide of formula EO. What is E?

The table shows the proton numbers of four elements. Which statement is correct?

The results of experiments involving four metals, W, X, Y and Z, and their ions are shown. Y(s) + Z⁺(aq) → Y⁺(aq) + Z(s) W(s) + X⁺(aq) → no reactio...