Cambridge & Pearson Edexcel Past Paper Questions

Compound X contains carbon, hydrogen and oxygen only. It has an Mr of 90. 100 g of compound X contains 40.0 g of carbon and 6.7 g of hydrogen. How ...

Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which row describes the changes that take place during the electrolysis?

Which row describes one advantage and one disadvantage of using a hydrogen-oxygen fuel cell to power a road vehicle?

Two gases react together to produce a single product. The rate of the reaction is affected by an increase in pressure. The reaction is catalysed by...

Calcium carbonate reacts with excess dilute hydrochloric acid to form carbon dioxide. The reaction is investigated in two experiments. The rate of ...

If calcium carbonate is heated in a closed container, it will decompose, forming calcium oxide and carbon dioxide. Calcium oxide and carbon dioxide...

Copper forms a red oxide, Cu2O, and a black oxide, CuO. In the presence of a catalyst, aqueous hydrogen peroxide, H2O2, decomposes to form water. T...

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

A student is provided with suitable apparatus, distilled water and the following reagents. solid magnesium hydroxide solid lead carbonate dilute ni...

When heated, copper(II) sulfate crystals, CuSO4•5H2O, react as shown. CuSO4.5H2O(s) → CuSO4(s) + 5H2O(g) When ......1...... copper(II) sulfate, whi...

Which formula represents the oxide of element Z in Group II of the Periodic Table?

Element X is in Group I. Some statements about element X are given. • X is not the least dense element in Group I. • X is more reactive than potass...

A student makes three statements about metals and non-metals. 1 All alloys contain at least one metal. 2 All metals are good thermal and electrical...

The equations for three reactions are given. 1 2O2- → O2 + 4e- 2 C + O2 → CO2 3 CaO + SiO2 → CaSiO3 These reactions take place in the extraction of...

The domestic water supply is treated to make it safe to drink. Which row identifies the treatment and its effect?

Sodium phosphate, Na3PO4, and ammonium nitrate, NH4NO3, are both used as fertilisers. Which row shows the correct percentage by mass of the element...

Three processes are shown. 1 the decomposition of vegetation 2 emissions from a car engine 3 photosynthesis Which row shows a gas produced in each ...

Which compound is not an alkane, alkene, alcohol or carboxylic acid?

Alkenes can be produced by the cracking of alkanes, such as decane, C10H22. Which equation shows the cracking of decane to produce two different al...

Alkenes undergo addition reactions with bromine to form dibromoalkanes. Which statement is correct?

How many moles of oxygen are required for the complete combustion of 2 moles of ethanol?

Two reactions are shown. reaction 1 CH2CH=CH2OH + H2 (Ni catalyst) → compound X reaction 2 compound X (acidified KMnO4(aq)) → compound Y Which row ...

A section of the structure of a protein is shown. [Displayed formula of protein section] How many amino acid monomer molecules have been used to ma...

Which piece of apparatus is used to measure exactly 27.3 cm³ of a liquid?

A student titrates aqueous sodium hydroxide with 0.1mol/dm³ hydrochloric acid. The titration results are used to calculate the concentration of the...

A mixture of four coloured dyes is analysed by chromatography. The result is shown. [Chromatogram showing four coloured dyes, solvent front, baseli...

An aqueous solution contains cations of metal X. A precipitate forms when a few drops of aqueous sodium hydroxide are added to the solution. The pr...

The pressure of a sample of air is reduced and its temperature remains constant. Which row describes the changes in the volume of the air and the d...

The main component of mineral X is calcium carbonate, CaCO3. X also contains tiny grains of silicon(IV) oxide, SiO2. There are no other substances ...

The structure of hydroxylamine, NH2OH, is shown. Which row about hydroxylamine is correct?

Metals lose electrons when they combine with a non-metal to form an ionic compound. Calcium combines with hydrogen to form the ionic compound calci...

What is a property of diamond?

Which statement about the bonding in copper is correct?

Aluminium ions, Al3+, react with sulfate ions, SO42-, to form aluminium sulfate. Which row shows the correct empirical formula and ionic formula of...

How many atoms are there in 27.0 g of water, H2O?

A mixture of sodium hydrogencarbonate and sodium chloride is heated. The equation for the reaction that takes place when sodium hydrogencarbonate i...

Which row is correct?

Some bond energy data are given in the table. Hydrazine, N2H4, reacts with oxygen, as shown. A value for the enthalpy change, ΔH, of this reaction ...

The rate of reaction between calcium carbonate and dilute hydrochloric acid is measured in three separate experiments. In experiment 1, the calcium...

The equation shows the reversible reaction between nitrogen and hydrogen to form ammonia. N2 + 3H2 ⇌ 2NH3 The forward reaction is exothermic. Which...

Some properties of a solid oxide are listed. • It reacts with dilute sulfuric acid giving a salt and water. • It is insoluble in water. • It reacts...

Two compounds are dissolved separately in water. When the two solutions are mixed, there is no observable change. What are the two compounds?

Part of the Periodic Table is shown. W, X, Y and Z are not the correct symbols of the elements. Which statement is correct?

Chlorine gas is bubbled into separate samples of aqueous potassium iodide and aqueous potassium bromide. In which solutions is there a colour change?

Which statement about the elements in Group VIII of the Periodic Table is correct?

Which elements are the major constituents of brass?

The diagrams show two methods in which metal X is used to prevent the rusting of iron. A student suggests that metal X must be less reactive than i...

Aluminium is extracted from molten aluminium oxide by electrolysis. Which material is used for the electrodes in the industrial extraction?

Which substance is used to remove odours in the treatment of the domestic water supply?

Carbon dioxide, methane and oxygen are gases involved in the carbon cycle. Which of these gases cause global warming?