Cambridge & Pearson Edexcel Past Paper Questions

Nitric acid, HNO3, is used to make fertilisers.

In a change of state at constant temperature and pressure: • energy is released as stronger forces of attraction form between the particles • the...

X, Y and Z are elements. X and Y are in the same period of the Periodic Table. Y and Z are in the same group of the Periodic Table. What are possib...

The numbers of electrons, protons and neutrons in four different particles are shown. particle electrons protons neutrons 1 19 19 20 2 18 19 20 3 2...

Some statements about the bonding in magnesium chloride are listed. 1 Each magnesium atom donates two electrons; each chlorine atom accepts one ele...

Ethane, C2H6, and ammonia, NH3, are covalent compounds. The dot-and-cross diagrams of these compounds are shown. [Dot-and-cross diagrams for ethane...

When a strip of copper is placed in aqueous silver nitrate, a displacement reaction takes place. What is the ionic equation for the reaction which ...

Three compounds are listed. • calcium carbonate • potassium sulfate • zinc nitrate Which row shows the element present in the greatest percentage b...

Two aqueous solutions, Q and R, have the same concentration in mol/dm³. Solution Q contains 4.0g of NaOH in 500 cm³ of solution. Which solution cou...

Samples of two hydrated compounds are weighed and then dehydrated by heating. The anhydrous compounds are weighed and the results are shown. 3.97 g...

What has a mass equal to the mass of one mole of water?

Concentrated aqueous sodium chloride is electrolysed using inert electrodes. Which row shows what happens in this electrolysis and why it happens?

Which statements about the energy changes during a chemical reaction are correct? 1 The activation energy, Ea, is the maximum energy the colliding ...

Two gases react inside a sealed vessel. Which change in conditions would increase the rate of reaction? 1 increasing the pressure inside the vessel...

Catalysts change the rate of chemical reactions. Which statements correctly describe the effect of adding a catalyst to a reaction? 1 All reactant ...

The equation for a reaction in the Contact process is shown. 2SO2(g) + O2(g) ⇋ 2SO3(g) ΔH = –197 kJ/mol The conditions used are 450 °C, 2 atmospher...

Universal indicator contains several dyes. The reversible reaction of one dye, IndOH, is shown. IndOH(aq) + H⁺(aq) ⇋ Ind⁺(aq) + H2O(l) colour X col...

The combustion of methane is a redox reaction. CH4 + 2O2 → CO2 + 2H2O Which statement about this reaction is correct?

Which method of preparation of magnesium sulfate is an example of a redox reaction?

Samples of HCl(aq) and HNO3(aq) are tested using universal indicator paper. The sample of HCl(aq) has a pH of 4 and the sample of HNO3(aq) has a pH...

Which two substances react to form a salt and water only?

The elements are arranged in groups and periods in the Periodic Table. Which row is correct?

Sodium, potassium and rubidium are in Group I of the Periodic Table. Chlorine, bromine and iodine are in Group VII. Which statement is correct?

Which statement about transition elements and their compounds is correct?

Three statements about the properties of metals are shown. 1 All metals conduct electricity. 2 All metals have two electrons in their innermost she...

Which statements about metals and their uses are correct? 1 Aluminium is used to make overhead electrical cables because it has a low density. 2 Al...

Stainless steel is an alloy. It contains iron and more than one other element. Which elements other than iron are commonly used in stainless steel?

The equations for some of the reactions of metals Q, R and T are shown. 2QNO3(aq) + Cu(s) → 2Q(s) + Cu(NO3)2(aq) R(s) + TSO4(aq) → T(s) + RSO4(aq) ...

Zinc is used to galvanise iron, which prevents the iron from rusting. Which statements are correct? 1 The layer of zinc forms a barrier between the...

Three statements about the extraction of aluminium are shown. 1 The electrolyte is aluminium oxide dissolved in molten cryolite. 2 Carbon is used f...

What is a cause of deoxygenation of water in a lake?

Dissolved substances can cause eutrophication and the deoxygenation of water. How many of the ions shown cause this effect? Cl⁻ CO3²⁻ Na⁺ NO3⁻ PO4³⁻

Which statement about global warming is correct?

The structures of three compounds, W, X and Y, are shown. [Structural formulas for W (CH3-C(OH)2-CH3), X (CH3-CH2-COOH), Y (CH3-CH(OH)-CH2OH)]. Whi...

What is the displayed formula of propyl methanoate?

The table shows some of the fractions obtained by the fractional distillation of petroleum and their uses. fraction use 1 bitumen making roads 2 ke...

Which equation shows the reaction of ethane with chlorine in the presence of ultraviolet light?

Hexan-3-ol is an alcohol. [Structural formula for hexan-3-ol (CH3-CH2-CH(OH)-CH2-CH2-CH3)]. How many molecules of oxygen are needed for the complet...

An organic compound, P, is dissolved in water. The concentration of the solution is 0.1 mol/dm³ and the pH is 3. A solid is added to the solution a...

A paper chromatography experiment is used to find an Rf value for Fe³⁺(aq). The chromatogram is shown. [Chromatogram showing solvent front, Fe³⁺ sp...

A laboratory has a powdered mixture of solid iodine and solid carbon. Iodine is very soluble in hexane and slightly soluble in water. Carbon is ins...

A sample of iodine is at room temperature and pressure. Which statement about the particles in the sample is correct?

Element Z, nucleon number 31, forms an ion Z³⁻. Where is Z found in the Periodic Table?

Naturally occurring bromine has a relative atomic mass of 80 and consists entirely of two isotopes of relative atomic masses 79 and 81. What can be...

Element X and element Y react together to form a compound. The electronic configurations of X and Y are X = 2,8,3 and Y = 2,6. Which row shows the ...

X is the arrangement of bonds around a carbon atom in graphite. Y is the arrangement of bonds around a carbon atom in diamond. Z is the arrangement...

What is the equation for the reaction between sodium carbonate and dilute nitric acid?

Which statements about relative atomic mass and relative molecular mass are correct? 1 The mass of the different isotopes does not affect relative ...

Aqueous hydrogen peroxide, H2O2, decomposes slowly at 25 °C. 2H2O2(aq) → 2H2O(l) + O2(g) The decomposition reaction takes place faster when a catal...

The diagram shows the structures of the atoms of two elements, X and Z. X and Z are not the atomic symbols for these elements. The elements combine...