Cambridge & Pearson Edexcel Past Paper Questions

Which is an anion that is present in the solution formed when an excess of dilute hydrochloric acid is added to calcium carbonate?

What correctly describes the molecules in very dilute sugar solution at room temperature?

The diagram shows a simple laboratory apparatus for the preparation and collection of a dry gas. What is the gas?

A mixture containing equal volumes of two liquids that mix completely but do not react together is placed in the apparatus shown and heated until t...

Which graph shows the number of electrons in the outer shell of an atom, plotted against the proton (atomic) number for the first ten elements in t...

Which pair of elements, when combined together, do not form a covalent compound?

The diagram shows the structure of a covalent compound containing the element hydrogen, H, and the unknown elements X, Y and Z. To which groups of ...

A metal consists of a lattice of positive ions in a 'sea of electrons'. What changes, if any, take place to the electrons and positive ions in a me...

What is the mass of one mole of carbon-12?

Two different hydrocarbons each contain the same percentage by mass of hydrogen. It follows that they have the same

The diagram shows the electrolysis of a concentrated aqueous solution containing both copper(II) ions and sodium ions. Which metal is deposited at ...

The diagram shows the apparatus used to electrolyse lead(II) bromide using inert electrodes. Why does the lamp light up only when the lead(II) brom...

A student performs two reactions. reaction 1 10 g of magnesium ribbon with excess 2.0mol/dm³ dilute hydrochloric acid reaction 2 5g of magnesium po...

Which statement about catalysts is correct for a typical equilibrium reaction?

When a solution containing silver ions is added to a solution containing iron(II) ions, an equilibrium is set up. Ag+(aq) + Fe2+(aq) ⇌ Ag(s) + Fe3+...

Which reaction does not involve either oxidation or reduction?

Which pair of compounds could be used in the preparation of calcium sulfate?

A metal reacts with dilute hydrochloric acid to produce a gas. What is used to identify this gas?

Titration of an acid against a base is a method often used in the preparation of salts. Which properties of the acid, the base and the salt are req...

The diagram shows part of the Periodic Table. Which pair of letters represents elements that are in the same period?

Which row shows the correct number of protons and electrons in the ion of an element in Group II of the Periodic Table?

The oxide of an element X increases the rate of decomposition of hydrogen peroxide. At the end of the reaction the oxide of X is unchanged. Which d...

Which element is sodium?

Which substances react together to give hydrogen?

In the extraction of iron, carbon monoxide acts as

An alloy of copper and zinc is added to an excess of dilute hydrochloric acid. Which observations are correct?

From your knowledge of the manufacture of both aluminium and iron, what is the order of chemical reactivity of aluminium, carbon and iron towards o...

Which compound will not produce ammonia when heated with ammonium sulfate?

These reactions are used in the manufacture of sulfuric acid. P S + O2 → SO2 Q 2SO2 + O2 ⇌ 2SO3 R SO3 + H2O → H2SO4 Which reactions are speeded up ...

Why is carbon used in the purification of drinking water?

Which gas burns in air to form only one product?

The diagram shows apparatus for measuring the volume of hydrogen given off when an excess of dilute hydrochloric acid is added to powdered metal. T...

The list shows three chemical reactions. 1 combustion of ethanol 2 fermentation of glucose 3 reaction of ethanol with ethanoic acid to give an este...

The diagram shows a reaction scheme. ethene + steam catalyst → compound X acidified potassium dichromate(VI) → compound Y compound X → compound Z W...

How does the number of carbon, hydrogen and oxygen atoms in an ester differ from the total number of carbon, hydrogen and oxygen atoms in the alcoh...

The two statements are about the fractional distillation of crude oil. The statements may or may not be correct. They may or may not be linked. sta...

An aqueous solution of a compound of formula C2H4O2 reacts with sodium carbonate, liberating carbon dioxide. What is the structural formula of the ...

When butanol, represented by C4HWOH, burns in air, carbon dioxide and water are formed. C4HWOH + XO2 → 4CO2 + yH2O Which values of w, x and y balan...

Which substances will burn in air and give carbon dioxide amongst the combustion products? 1 calcium carbonate 2 ethane 3 ethanol 4 methanol

The macromolecules of proteins, fats and carbohydrates can all be broken down into their simple units by a similar process. What is the process cal...

Copper(II) sulfate crystals are separated from sand using the four processes listed below. In which order are these processes used?

A drop of liquid bromine is placed in the bottom of a gas jar. Brown fumes of bromine vapour slowly spread through the covered gas jar. Why does th...

The diagrams show an experiment with aqueous ammonium chloride. A gas, Y, is produced and the litmus paper changes colour. What are solution X and ...

What is the mass of oxygen contained in 72 g of pure water? [Relative atomic masses: H = 1; O = 16]

A student tested a solution by adding aqueous sodium hydroxide. A precipitate was not seen because the reagent was added too quickly. What could no...

Which molecule has the largest number of electrons involved in covalent bonds?

In which of the following is there a lattice of positive ions in a 'sea of electrons'?

Which statement about both chlorine atoms and chloride ions is correct?

Element X has the electronic structure 2,8,5. Element Y has the electronic structure 2,8,7. What is the likely formula of a compound containing onl...

A covalent bond is formed by