Cambridge & Pearson Edexcel Past Paper Questions

A sample of tap water gave a white precipitate with acidified silver nitrate. What does this show about the tap water?

Which noble gas is present in the largest percentage by volume in air?

A hydride is a compound containing only two elements, one of which is hydrogen. Which element forms the most hydrides?

The structural formulae of some organic compounds are shown below. Which compounds are alcohols?

Which compound is manufactured by reacting ethene with steam in the presence of a heated catalyst?

A hydrocarbon, C₃Hᵧ, burns in air to form carbon dioxide and water. C₃Hᵧ(g) + 5O₂(g) → 3CO₂(g) + y/2 H₂O(g) What is the value of y?

Which pair of macromolecules both contain the linkage shown?

Under certain conditions 1 mole of ethane reacts with 2 moles of chlorine in a substitution reaction. What is the formula of the organic product in...

Shown below are some properties of compound X. • reacts with potassium carbonate to produce carbon dioxide • reacts with ethanol to produce a sweet...

It is suspected that a lollipop contains traces of a poisonous green dye (boiling point 73°C) as well as two harmless orange and red dyes (boiling ...

Element X does not conduct electricity and has a low melting point. Which could be element X?

Substance Q is a soluble salt. An aqueous solution of Q is tested as shown. Test: warm Q with aqueous sodium hydroxide, Observation: alkaline gas g...

Which statement explains why the gases propane, C3H8, and carbon dioxide, CO2, diffuse at the same rate at room temperature and pressure?

Hydrogen chloride is very soluble in water, whereas chlorine is only slightly soluble in water. Both gases can be dried using concentrated sulfuric...

Which of the following is not a mixture?

The table gives the arrangements of electrons in the atoms of four different elements. Which element does not form an ionic compound with chlorine?...

A compound Y is the only substance formed when two volumes of dry ammonia gas react with one volume of dry carbon dioxide (both volumes measured at...

For which compound is the type of bonding correct? Compound bonding table: A: ammonia ionic, B: carbon dioxide covalent, C: sodium chloride covalen...

Why do graphite and diamond have different physical properties?

Which statement about the particles O²¯, F¯, Ne, Na⁺ and Mg²⁺ is true? They all

The Mr of oxygen, O2, is 32 and the Mr of sulfur is 256. What is the formula of a molecule of sulfur?

In the experiment shown in the diagram, the bulb lights and a gas is produced at each electrode. What is X?

Which element in the table is an alkali metal? Table: melting point °C, density g/cm³ -- A: -39 13.60, B: -7 3.10, C: 98 0.97, D: 1083 8.92.

The diagram shows the steps by which carbon dioxide can be converted into organic products and finally returned to the atmosphere. Which step is en...

Which industrial reaction does not involve a catalyst?

Salts containing which of the following anions are always soluble in water?

What is a property of the hydroxide, OH¯, ion?

The diagram shows some reactions of copper compounds. Which change is made by adding an acid?

Which process is a renewable energy source?

An element X forms an ion X3-. In which group of the Periodic Table will this element be found?

A metal, X, has a low melting point, reacts with water, forms only one oxide and is extracted from its ore by electrolysis. What is the identity of X?

Metallic objects may be decorated by having very thin layers of gold applied to them. Which properties of gold make it suitable for this use? Prope...

Iron pipes corrode rapidly when exposed to sea water. Which metal, when attached to the iron, would not offer protection against corrosion?

Metal M will displace copper from aqueous copper(II) sulfate solution, but will not displace iron from aqueous iron(II) sulfate solution. M is extr...

Which gas can be removed from the exhaust gases of a petrol-powered car by its catalytic converter?

What is the function of silica, SiO2, in the equation shown below? CaO + SiO2 → CaSiO3

A mixture of two gases has no effect on either damp blue litmus paper or damp red litmus paper. Which gases are present in the mixture?

Which contains the greatest mass of nitrogen?

The diagram shows some of the uses of sulfur dioxide. Which two of the numbered boxes are correct?

Which row shows both the correct source and the correct effect of the named pollutant? Pollutant, source, effect table: A: carbon monoxide, incompl...

The diagram shows two compounds. It can be predicted from their formulae that the compounds have the same

Which statement concerning isomers is true?

Which compound will react with ethanol to form an ester?

In the purification of water, what is the purpose of carbon?

Four conversions are listed. 1 amino acids to proteins 2 ethene to poly(ethene) 3 proteins to amino acids 4 starch to glucose Which two conversions...

What is the name of the ester CH3COOC2H5?

Which process provides the best evidence for the particle theory of matter?

The results of two tests on a solution X are shown. reagent added | few drops | an excess aqueous sodium hydroxide | white precipitate | precipitat...

A student wanted to follow how the rate of the reaction of sodium sulfite with acid varies with time. The reaction produces gaseous sulfur dioxide....

The apparatus shown is used to distil a dilute solution of ethanol in water. [B.P.: ethanol, 78°C; water 100°C] Which graph shows the change in con...