Cambridge & Pearson Edexcel Past Paper Questions

A pure sample of element X has a relative atomic mass of 51.8. The sample consists of three isotopes. The table shows the relative masses and perce...

Magnesium reacts with oxygen to form magnesium oxide. 2Mg + O2 → 2MgO Which row is correct?

Which description of metallic bonding is correct?

The ions Ca2+ and PO43– combine to form an ionic compound. What is the formula of the compound?

Magnesium reacts with aqueous copper(II) sulfate to form copper and aqueous magnesium sulfate. What is the correct equation for this reaction?

An organic compound has an Mr of 88. What is the molecular formula of this compound?

10 cm³ of hydrogen gas is mixed with x cm³ of chlorine gas. The equation for the reaction that takes place is shown. H2(g) + Cl2(g) → 2HCl(g) All t...

100 cm³ of aqueous potassium hydroxide with a concentration of 1.00 mol/dm³ reacts with excess dilute sulfuric acid. 2KOH(aq) + H2SO4(aq) → K2SO4(a...

Which statement about electrolysis is correct?

The diagram shows an electrolysis experiment using inert electrodes. Which row shows what happens to the concentration of the electrolyte in L and ...

Which row is correct for a chemical reaction in which ∆H is negative?

The diagram shows apparatus used to investigate two different reactions that produce gases. The reactants for each experiment are mixed and the mas...

In a closed flask, gases Q and R reach a dynamic equilibrium. Q(g) ⇌ 2R(g) ∆H is positive Which change will move the equilibrium to the right?

Which row shows the typical conditions used for the conversion of sulfur dioxide to sulfur trioxide in the Contact process?

The pH of dilute ethanoic acid is measured. The equation for the partial dissociation of ethanoic acid is shown. CH3COOH(aq) ⇌ CH3COO¯(aq) + H+(aq)...

Which element reacts with oxygen to produce an amphoteric oxide?

Element X is in Period 2 of the Periodic Table. X reacts with magnesium to form an ionic compound with the formula MgX2. What is X?

Rubidium is an element in Group I of the Periodic Table. Which statement about rubidium is correct?

M is a metal that forms coloured compounds. M is extracted from its oxide either by heating with carbon or by electrolysis. M reacts with dilute hy...

Which statement about brass is correct?

Iron is galvanised with zinc to prevent rusting. Which type of protection is provided by galvanising?

Iron is extracted from its ore hematite in a blast furnace. Which statement about this extraction process is correct?

Chlorine and carbon are both used in the treatment of the domestic water supply. Which row describes one reason for the use of each substance?

Which row states an adverse effect for the named pollutant?

Three statements about global warming and greenhouse gases are listed. 1 Global warming is occurring because more of the Earth's thermal energy is ...

Which compound is an alcohol?

An ester has the structural formula CH3COOCH2CH2CH3. What is the name of this ester?

Petroleum is separated into fractions in a fractionating column. Which property of the fractions increases from the bottom to the top of the column?

Three statements about alkanes are listed. 1 They contain carbon and hydrogen only. 2 They contain only single covalent bonds. 3 They are saturated...

The flowchart shows some reactions of hydrocarbons. Which row is correct?

The structure of a condensation polymer is shown. Which two monomers form this polymer?

A titration is completed. 25.0 cm³ of aqueous sodium hydroxide is added to a conical flask. A few drops of methyl orange indicator are added. Dilut...

An impure sample of compound X has a melting point of 120 °C. X is purified and its melting point is measured again. Which row is correct?

Samples of two compounds, P and Q, are tested. The result of each test is shown. Which row shows the identities of the ions present in P and Q?

Substance X dissolves in water to form a colourless solution. This solution reacts with aqueous lead(II) nitrate in the presence of dilute nitric a...

The diagram shows a diffusion experiment. Which gas, when present in the beaker over the porous pot, will cause the water level at Y to rise?

The diagram shows apparatus used to obtain carbon monoxide. What is the main purpose of Y?

The boiling points of various gases found in the air are shown below. °C argon -186 carbon dioxide -78 nitrogen -198 oxygen -183 If the air is co...

The fractional distillation apparatus shown is to be used for separating a mixture of two colourless liquids. A thermometer is missing from the app...

Hydrogen can form both H⁺ ions and H¯ ions. Which one of the statements below is correct?

A dark, shiny solid, X, conducts electricity. Oxygen combines with X to form a gaseous oxide. What is X?

The diagram shows the molecule ethyl propanoate. How many bonding pairs of electrons are there in the molecule?

The conduction of electricity by metals is carried out by the movement of

Which substance could be sodium chloride? conduction of electricity melting point/°C when liquid in aqueous solution A -114 nil good B 180 nil nil...

What is the concentration of iodine molecules, I2, in a solution containing 2.54 g of iodine in 250 cm³ of solution?

The diagram shows the results of an electrolysis experiment using inert electrodes. Which could be liquid X?

The energy profile for the forward direction of a reversible reaction is shown. Which row correctly shows the sign of both the activation energy a...

Which graph represents how the rate of reaction varies with time when an excess of calcium carbonate reacts with dilute hydrochloric acid?

In which reaction is nitric acid acting as an oxidising agent?

A student mixed together aqueous solutions of Y and Z. A white precipitate formed. Which could not be solutions Y and Z? solution Y solution Z A ...