Cambridge & Pearson Edexcel Past Paper Questions

The activation energy, Eₐ, of the reaction between aqueous manganate(VII) ions, MnO₄⁻(aq), and aqueous ethanedioate ions, C₂O₄²⁻(aq), can be determ...

The table shows the numbers of protons, neutrons and electrons in four different particles, W, X, Y, and Z. number of protons number of neutrons nu...

Where in the Periodic Table is the element that has an outer electron shell arrangement of 4s²4p³? Group Period A 13 3 B 13 4 C 15 3 D 15 4

Substance Q is a hydrocarbon. When 1.00 g of Q is completely burned, 3.22 g of carbon dioxide is produced. What could be the identity of Q?

Originally, chemists thought indium oxide had the formula InO. By experiment they showed that 4.8 g of indium combined with 1.0g of oxygen to produ...

In which substance are the only intermolecular forces temporary dipole-induced dipole attractions?

A solution contains 0.25 g of sulfur dioxide in 1.00 dm³ of water. Which volume of sulfur dioxide, measured at 50 °C and a pressure of 1 × 10⁵ Pa, ...

An experiment was performed to determine the enthalpy of combustion of ethanol. [Figure showing experimental setup for calorimetry] The data collec...

VO₂Cl reacts with NaI under acidic conditions. 2VO₂Cl + 2H₂SO₄ + 2NaI → VOCl₂ + VOSO₄ + I₂ + Na₂SO₄ + 2H₂O The oxidation state of Cl is −1 in VO₂Cl...

In which reaction is water behaving as a Brønsted-Lowry base?

A large excess of marble chips is reacted with 25 cm³ of 1.0 mol dm⁻³ hydrochloric acid at 40 °C. How is the result different when the reaction is ...

The Boltzmann distribution curve for a gaseous mixture of ethene and hydrogen is shown. Nickel is an effective catalyst for the reaction that occur...

Which observations are made when a sample of silicon chloride, SiCl₄, is added to a beaker of water?

Which row is correct? statement reason A The first ionisation energy of phosphorus is greater than that of magnesium. electron is lost from a 3p or...

Which row correctly describes one property of barium and one property of barium oxide? observation when barium metal is added to water pH of soluti...

An anhydrous white salt, Z, is heated strongly for 30 minutes. A mixture of gases is given off. The solid remaining in the test-tube is then dissol...

Chlorine gas is reacted with aqueous sodium hydroxide. The oxidation number of chlorine changes from 0 to –1 and also from 0 to +1. Under which con...

When concentrated sulfuric acid reacts with sodium iodide the products include sulfur, iodine, hydrogen sulfide and sulfur dioxide. Which statement...

NO, NO₂, CO and unburnt hydrocarbons are present in the exhaust gases of internal combustion engines. When catalytic converters are used to remove ...

Methylamine, CH₃NH₂, has similar chemical properties to ammonia, NH₃. Methylamine reacts with hydrogen chloride to form a white crystalline salt, m...

The structures of citric acid and isocitric acid are shown. [Figure showing structures of citric acid and isocitric acid] How many chiral centres d...

How many tertiary alcohols have the molecular formula C₆H₁₄O?

The diagram shows the structure of a bromo compound that may be formed by the reaction of bromine with a hydrocarbon. [Figure showing structure of ...

Part of the structure of strobilurin is shown. R and R' are inert groups. [Figure showing partial structure of strobilurin] Strobilurin is warmed w...

Which compound produces a ketone when refluxed with an acidified solution of potassium dichromate(VI)?

Dibromopentanes can undergo 'double elimination' reactions to produce hydrocarbons. 2NaOH + C₅H₁₀Br₂ → C₅H₈ + 2NaBr + 2H₂O Which isomer produces on...

The diagram shows the formation of compound Y from compound X in a chemical reaction. R₁ and R₂ are alkyl groups. [Figure showing X + HCN (KCN cata...

In this question you can assume that ¹H and ³H have the same chemical properties. A sample of ethanal contains only one isotope of hydrogen, ¹H. It...

Which reaction gives butanoic acid as one of its products?

When reactant X is treated with a suitable reagent, products Y and Z are formed. Infrared spectra of X, Y and Z are shown. [Figure showing IR spect...

A sample of 17.15 mol HI(g) is in dynamic equilibrium with 2.27 mol H₂(g) and 2.84 mol I₂(g) in a volume of 1 m³ at 764 K and 141 kPa. H₂(g) + I₂(g...

An energy cycle for the combustion of methane is shown. [Figure showing energy cycle for combustion of methane] Which expressions can be used to ca...

Many gases do not obey the general gas equation at high pressures. Why is this? 1 At higher pressures the molecules have more energy. 2 At higher p...

Which species can accept a lone pair of electrons to form a coordinate (dative covalent) bond? 1 BF₃ 2 H⁺ 3 CH₃⁺

A sample containing x mol of Al₂Cl₆ is dissolved in water to give solution W. In order to precipitate all of the aluminium as its hydroxide, y mol ...

Nitrogen dioxide gas is produced when petrol is burned in car engines. Which acids are made in the atmosphere as a result of this release of nitrog...

In which reactions is the major product formed by a nucleophilic substitution reaction? 1 bromoethane + potassium cyanide in ethanol 2 bromoethane ...

An excess of P reacts with Q, in the presence of concentrated sulfuric acid, to form R. Effervescence is seen when a piece of sodium is added to pu...

Two carbonyl compounds have the molecular formula C₃H₆O. Which reagents give different observations with these two compounds? 1 acidified aqueous p...

An organic compound, T, does not fizz when aqueous sodium carbonate is added to it. Compound T contains 27.6% by mass of oxygen. What could be the ...

The rate of chemical reactions is affected by changes in temperature and pressure.

Chlorine, Cl₂, is a reactive yellow-green gas. It is a strong oxidising agent.

Compounds P, Q and R have all been found in the atmosphere of one of Saturn's moons. P N≡C—C≡C—C≡N Q H—C≡C—C≡N R H | H—C—C≡N | H...

Hydroxyethanal, HOCH₂CHO, has been observed in dust clouds near the centre of our galaxy. [Figure 4.hydroxyethanal_structure]

In this experiment you will carry out a titration to identify the Group 1 metal, M, present in a metal hydrogencarbonate, MHCO3. FA 1 is 0.0550 mo...

In this experiment you will determine the relative formula mass of the same metal hydrogencarbonate, MHCO3, by thermal decomposition. Then you will...

The most common oxidation states of cobalt are +2 and +3. Complete the electronic configurations of the following free ions. • Co2+ [Ar] • Co³+ [Ar]

Iron(II) compounds are generally only stable in neutral, non-oxidising conditions. It is difficult to determine the lattice energy of FeO experimen...

Iodates are compounds that contain the IO3¯ anion.

The transition elements are able to form stable complexes with a wide range of molecules and ions.