Cambridge & Pearson Edexcel Past Paper Questions

4.0 g of sodium hydroxide, NaOH, is dissolved in 250 cm³ of water in a graduated flask. A 25 cm³ sample of this solution is titrated with 0.50 mol/...

Dilute aqueous solutions of potassium chloride and magnesium chloride are mixed together. A sample of the mixture is electrolysed using inert elect...

The table gives some statements about electrolysis and the reason why each statement is true. Which row shows a correct statement and the correct r...

Students proposed four cells to produce electricity in a school laboratory. Which cell would produce the largest voltage in a safe way?

Nitrogen oxides may form in the atmosphere during lightning activity. N₂ + O₂ ⇌ 2NO The reaction is endothermic. Which energy profile diagram is co...

Magnesium reacts with dilute sulfuric acid. Mg(s) + H₂SO₄(aq) → MgSO₄(aq) + H₂(g) Which changes in the conditions will result in the lowest rate of...

Carbonates react with dilute acids to produce carbon dioxide. A student uses excess carbonate and 100 cm³ of 0.1 mol/dm³ acid and measures the volu...

In the Contact process, sulfur is converted into sulfuric acid. A catalyst is added to the reaction mixture shown in the equation. 2SO₂(g) + O₂(g) ...

Under certain conditions, iron reacts with chlorine to form iron(III) chloride. 2Fe + 3Cl₂ → 2FeCl₃ Which statement about this reaction is correct?

The equation shows a reaction in the Contact process. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ΔH = –196 kJ/mol Which change would move the position of equilibriu...

The table shows the pH values of some substances that can be consumed by humans. Which statement about these substances is correct?

Solution X is added to a solid salt, causing gas Y to be evolved. Gas Y dissolves in water resulting in a solution with a pH of less than 7. What a...

A pure sample of a salt is obtained by filtration followed by evaporation of the filtrate. Which pair of reagents would produce the salt?

Which set of conditions is used in the Contact process?

Part of the Periodic Table is shown. Which substance is an unreactive gas found in the atmosphere?

Pollution may be caused by oxides of carbon, nitrogen and sulfur. Which elements can each form more than one oxide?

A river runs through an area of land that is used for growing cotton. The cotton farmers applied a large amount of fertiliser to their fields. This...

Which compound is an alkane?

The equation shows the reaction that takes place when butanol is completely combusted in air. C₄H₉OH(l) + xO₂(g) → yCO₂(g) + zH₂O(g) What are the v...

Which row shows all the elements present in the polymers listed? • nylon • poly(ethene) • Terylene

The partial structure of a polyamide is shown. Which monomers would produce this polymer?

The diagram shows part of the Periodic Table. |||III|IV|V|VI|VII|VIII ---|---|---|---|---|---|---| || Na|| K|Ca|Cr|Fe|Ni|Zn| Sr|||Ag| Ba|| Answer...

Carbon dioxide is a gas at room temperature.

The alkenes are a homologous series of hydrocarbons.

This question is about ammonia and ammonium salts.

This question is about compounds of nitrogen.

This question is about alcohols and polymers.

Zinc powder reacts with dilute hydrochloric acid. Zn + 2HCl → ZnCl2 + H2 When 20.0cm³ of dilute hydrochloric acid is added to excess zinc, the volu...

The diagram shows part of the Periodic Table. [Figure 1.0 - Periodic Table] Answer the following questions using only the symbols of the elements i...

This question is about ammonium sulfate, (NH4)2SO4.

This question is about nitrogen and oxides of nitrogen.

This question is about carboxylic acids and polymers.

Magnesium carbonate reacts with dilute hydrochloric acid. MgCO3 + 2HCl → MgCl2 + CO2 + H2O When 25.0cm³ of dilute hydrochloric acid is added to exc...

In which changes do the particles move further apart? 1 A gas is heated from 0°C to 25 °C. 2 Pressure is applied to a gas at a constant temperature...

Data about two compounds is given. Both compounds have a simple molecular structure. compound, melting point /°C, boiling point /°C H2S, -85, -61 P...

Substances can be elements, compounds or mixtures. Which row is correct? element, compound, mixture

The letters X, Y and Z represent different atoms. 40 X 19 39 Y 19 40 Z 20 Which statement is correct?

A student makes three statements. 1 Calcium ions have a 2+ charge and oxide ions have a 2- charge. 2 Magnesium ions and oxide ions have the same el...

Four statements about graphite, diamond and silicon(IV) oxide are listed. 1 Diamond and silicon(IV) oxide are both very hard and have similar struc...

Which row is correct? compound, molecular formula

Compound Y is the only substance formed when 500 cm³ of ammonia reacts with 250 cm³ of carbon dioxide. All measurements are at r.t.p. What is the f...

How many sodium ions are there in 30 g of sodium sulfate?

Three compounds are listed. copper(II) nitrate, Cu(NO3)2 zinc sulfate, ZnSO4 sodium thiosulfate, Na2S2O3 Which row shows the element that is presen...

The complete combustion of 20 cm³ of a gaseous alkane, X, requires 130 cm³ of oxygen. Both volumes are measured at r.t.p. What could be the identit...

Aqueous copper(II) sulfate is electrolysed with copper electrodes. What is the equation for the reaction occurring at the anode?

Three statements about fuel cells are given. 1 A hydrogen-oxygen fuel cell requires a continuous input of fuel and oxygen. 2 In a hydrogen-oxygen f...

Under certain conditions, nitrogen reacts with oxygen to form N2O. 2N2(g) + O2(g) ⇋ 2N2O(g) The reaction pathway diagram is shown. What is the acti...

Hydrogen and bromine react to form hydrogen bromide. H2 + Br2 → 2HBr Bond energy data is given in the table. bond, bond energy in kJ/mol H-H, 436 B...

Octane, C8H18, is a hydrocarbon. When octane is mixed with an excess of oxygen, no change takes place unless energy is supplied. If energy is suppl...

A student plans to investigate how the rate of the reaction changes when hydrochloric acid and calcium carbonate react. CaCO3(s) + 2HCl(aq) → CaCl2...