Cambridge & Pearson Edexcel Past Paper Questions

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...

Aqueous silver nitrate is added to separate solutions of potassium chloride and sodium iodide. What are the colours of the precipitates formed?

Which substance will not conduct electricity at room temperature and pressure?

Which diagram correctly shows the arrangement of the ions in solid sodium chloride?

The diagram shows the electrolysis of aqueous sodium chloride and of molten sodium chloride. Which substance in the diagram has both positive ions ...

Which statement describes the conversion of magnesium atoms to magnesium ions?

The diagram shows the structural formula of the covalent molecule hydrazine, N2H4. Consider all the electrons in a molecule of hydrazine. Which des...

Sodium hydrogencarbonate decomposes on heating. 2NaHCO3 → Na2CO3 + H2O + CO2 In an experiment, a 5.0 mol sample of sodium hydrogencarbonate is heat...

Nitrogen and oxygen react according to the equation. N2(g) + 2O2(g) → 2NO2(g) The enthalpy change for the reaction shown is +66 kJ. If two moles of...

Which statement about the four gases carbon dioxide, CO2, hydrogen, H2, oxygen, O2 and ozone, O3 is correct?

When dilute sulfuric acid is electrolysed between inert electrodes, which statements are correct? 1 Hydrogen is released at the negative electrode....

When electrolysed using inert electrodes, which dilute solution would produce the greatest increase in mass of the cathode? [Ar: Al, 27; Cu, 64; Pb...

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

When bismuth(III) chloride, BiCl3, is added to water, a white precipitate of BiOCl is formed. BiCl3(aq) + H2O(l) ⇌ BiOCl(s) + 2HCl(aq) If this reve...

Which colour change occurs when ethanol is added to a small quantity of warm, acidified potassium dichromate(VI)?

Sulfur and selenium, Se, are in the same group of the Periodic Table. From this, we would expect selenium to form compounds having the formulae

When the product of a reaction between two gases is added to water, a solution of pH7 is formed. Which could be these gases?

When pure gas X was passed through the apparatus shown, the copper(II) oxide turned pink and the limewater stayed colourless. What is gas X?

Which reagent is added to aqueous potassium chloride to prepare lead chloride?

Which change in the properties of the halogens is not correct?

W, X and Y are elements in the same period of the Periodic Table. • X forms compounds of formulae XCl2 and XCl3. • Y forms a solution of pH12 when ...

The diagram shows the structure of an alloy. Which statement about alloys is correct?

The metals iron, lead and zinc can be manufactured by the reduction of their oxides with coke. What is the correct order of the ease of reduction o...

Aluminium is manufactured by the electrolysis of molten aluminium oxide. Which gas is not formed during this process?

Which diagram correctly illustrates the conditions necessary for the rusting of iron and also the metal that can be used to prevent rusting by sacr...

Metals usually occur in their ore combined with another element. Which metal is least likely to occur combined with another element?

The noble gases, argon, helium, krypton and xenon, are present in air. Which noble gas is present in the largest proportion?

Which gas will react with ozone in the upper atmosphere of the Earth?

Iron is extracted from iron ore in a blast furnace. Which solid substances are fed into the top of the blast furnace? 1 coke 2 cryolite 3 limestone

The diagram shows a simplified structure of a fat. Which compounds in the table have linkages that can be found in this fat? (Do not consider C-H o...

The solubility of the carboxylic acids in water decreases as the size of the carboxylic acid molecules increases. Which carboxylic acid is the leas...

Poly(ethene) is the addition polymer formed from the monomer ethene. Which statement is correct?

The diagram shows the fractionation of crude oil. Which row explains why fraction R is collected above fraction S?

In the manufacture of ethanoic acid, the chemical industry uses the following sequence of reactions. compound X →(1) ethene →(2) ethanol →(3) ethan...

Esters are formed when an alcohol reacts with a carboxylic acid. Which ester would be formed using the carboxylic acid and alcohol shown?

Which equation represents a combustion reaction?

Calcium carbonate reacts with hydrochloric acid, producing carbon dioxide gas. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) The rate of this r...