Cambridge & Pearson Edexcel Past Paper Questions

Sphalerite is an ore containing compounds of zinc. One of the compounds in the ore is ZnS.

A scientist investigates the thermal decomposition of calcium carbonate in a closed system. A dynamic equilibrium mixture is established. CaCO3(s) ...

Sulfamic acid has the structure shown. [Figure X.X]

Ester A has the structure shown. [Figure X.X]

An experiment is done to measure the rate of reaction between calcium carbonate and dilute hydrochloric acid. The gas formed is collected in a gas ...

After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver nitrate to give a white precipitate. What could ...

A paper chromatography experiment is carried out to separate and identify the mixture of amino acids produced from the hydrolysis of a protein. Whi...

Which conditions will give the highest rate of diffusion of a gas?

Cobalt is a transition element. A particle of cobalt contains 24 electrons and has a nucleon number of 60. Which statement about this particle is c...

Diamond and graphite are two different forms of the element carbon. They each have different uses. Which row is correct?

Which diagram shows the outer electron arrangement in calcium fluoride?

What is the number of shared pairs of electrons in an ammonia molecule?

Two statements about metals are given. 1 Metals contain a lattice of negative ions in a 'sea of electrons'. 2 The electrical conductivity of metals...

In a volumetric experiment, 25.0 cm³ of 0.100 mol/dm³ sodium hydroxide reacts exactly with 20.0 cm³ of sulfuric acid. 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O...

The reaction for the conversion of bromoethane to ethanol is shown. C₂H₅Br + NaOH → C₂H₅OH + NaBr In an experiment, 10.90 g of bromoethane is conve...

One mole of a sugar, (CH₂O)₆, is burned. Which volume of oxygen, measured at room temperature and pressure, is required for complete combustion of ...

Which statement about the purification of copper by electrolysis is correct?

Which negative ions are present in aqueous copper(II) sulfate?

The diagram shows the energy profile for a reaction. Which statement about this reaction is correct?

The table shows the energy released by the complete combustion of some compounds. Which compound releases the least energy when 1 g is completely b...

Three experiments are carried out in which the same mass of magnesium is reacted with the same volume of dilute sulfuric acid at room temperature. ...

The equations show four reversible reactions. For which reaction would the equilibrium move to the right for both an increase in pressure and an in...

Gas X turns acidified potassium manganate(VII) from purple to colourless. Gas Y turns aqueous potassium iodide from colourless to brown. What do th...

Why is ethanoic acid described as a weak acid?

What is the best method to prepare a pure sample of copper(II) sulfate?

What is the percentage by mass of nitrogen in ammonium nitrate, NH₄NO₃?

A student makes three suggestions about the Haber process and the Contact process. 1 Only one process uses a raw material obtained by fractional di...

Element X forms: • a covalent compound, H₂X • an ionic compound, Na₂X • oxides XO₂ and XO₃. To which group of the Periodic Table does X belong?

Which property is common to ⁴⁰Ca, ³⁹K and ²³Na?

Palladium is an element, atomic number 46. Some of its properties, and the properties of its compounds, can be predicted from its position in the P...

Three different elements react by losing electrons. The ions formed all have the electronic configuration 2,8. Which statement about these elements...

A power cable requires an element that: 1 conducts electricity 2 has a relatively low density 3 is resistant to aerial oxidation. Which of these co...

Some atmospheric pollutants are listed. 1 sulfur dioxide 2 methane 3 nitrogen dioxide 4 unburned hydrocarbons Which substances could be removed by ...

River water contains many impurities. Which process alone can produce pure water from river water?

Compound Q is a hydrocarbon that has no isomers. Compound Q does not decolourise bromine in the dark. Which compound could be Q?

Which organic compound requires the least number of moles of oxygen for the complete combustion of one mole of the compound?

When a molecule of a saturated hydrocarbon is cracked, it forms two molecules X and Y. Which row is correct?

The structures and names of three alcohols, P, Q and R are shown. The structures may not be named correctly. Which structures are correctly named?

What is the empirical formula of ethanoic acid?

What is the structure of propyl methanoate?

Which substance, on combustion, produces oxides of nitrogen?

The monomer used to manufacture polystyrene is shown. By which type of polymerisation is polystyrene formed and what is a possible partial structur...

The diagrams show four different methods of collecting gases. Which method is suitable for collecting a gas which has the properties described?

The diagram represents a chromatogram of the colourless acids present in a drink. The chromatogram has been treated with a locating agent. A table ...

Which gas will diffuse at the fastest rate at the same temperature and pressure?

Two particles, K⁺ and Ar, can be written as ³⁹₁⁹K⁺ and ⁴⁰₁⁸Ar. Which statement about these particles is correct?

A mineral deposit is found to contain small grains made entirely of the element carbon. Which property will definitely be true of the grains of car...

How many shared pairs of electrons are there in one carbon dioxide molecule?

Which mass of carbon contains the same number of atoms as 16.0 g of sulfur?

3.0 dm³ of sulfur dioxide is reacted with 2.0 dm³ of oxygen. 2SO2(g) + O2(g) → 2SO3(g) Assuming the reaction goes to completion and that all gases ...