Cambridge & Pearson Edexcel Past Paper Questions

You are provided with solution W and solid X. Do the following tests, recording all of your observations at each stage. Tests on solution W

You are not expected to do any experimental work for this question. Baking soda is used to make bread rise. When baking soda is heated, it decompos...

A student uses chromatography to separate the dyes in a food colouring. Fig. 1.1 shows the apparatus the student uses. [Figure 1.1]

White vinegar is a colourless solution containing ethanoic acid. A student titrates 0.400 mol/dm³ aqueous sodium hydroxide with two samples of vine...

A student investigates solution W and copper(II) carbonate. (a) The tests the student does on W are shown in Table 3.1. Some of the observations fo...

Baking powder is used to make cakes rise. When water is added to baking powder, carbon dioxide gas is released. The longer the baking powder is sto...

A student investigates the rusting of iron. Fig. 1.1 shows the apparatus the student uses. [Figure 1.1 showing three experiments, A, B, C. All expe...

Aqueous ammonia is a solution of ammonia gas. A student titrates two samples of aqueous ammonia, A and B, with 0.500 mol/dm³ hydrochloric acid. The...

A student investigates solution W and solid X.

Baking soda is used to make bread rise. When baking soda is heated, it decomposes and carbon dioxide gas is released. Baking soda also decomposes g...

A scientist heats a sample of a liquid. The scientist measures the temperature of the sample and plots a graph of the temperature against time. Whi...

A sample of substance X contains iron and sulfur only. [Ar: Fe, 56; S, 32] In which row is it possible for both statements about X to be correct?

A chlorine atom, Z, has a nucleon number of 37. Which row is correct?

Which particles are isotopes of the same element? particle electrons neutrons protons W 22 28 25 X 23 28 25 Y 26 30 26 Z 26 28 26

Statements about graphite and silicon(IV) oxide, SiO₂, are given. Which statement is correct?

Statements about empirical and molecular formulae are given. Which statement is correct?

What is the relative formula mass, Mr, of aluminium oxide?

How many ions are there in 16.0 g of anhydrous copper sulfate?

Which sample contains the most atoms?

The reactions shown all produce hydrogen. Which reaction produces the greatest volume of hydrogen, measured at room temperature and pressure?

Four solutions of NaOH are made by dissolving solid NaOH in distilled water. Which method makes a solution with a concentration of 0.10 mol/dm³? [M...

Which row shows the substances that can be electrolysed?

The apparatus shown is set up to electroplate a steel key with copper. The key does not get coated with copper. Which change needs to be made to el...

Ammonium nitrate dissolves in water. H₂O NH₄NO₃(s) → NH₄NO₃(aq) ΔH = +25 kJ/mol Which statements are correct? 1 The process is endothermic. 2 The w...

Hydrogen reacts with oxygen to produce water. H-H H-H + O=O → H-O-H H-O-H Some bond energies are shown. bond bond energy in kJ/mol H-H 436 O-O 146 ...

Silicon(IV) chloride, SiCl₄, boils at 58 °C. Which row shows the type of change when silicon(IV) chloride boils and the explanation?

A 2 g sample of calcium carbonate reacts with dilute hydrochloric acid as shown. CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l) Which change in ...

Excess aluminium reacts with dilute hydrochloric acid. 2Al + 6HCl → 3H₂ + 2AlCl₃ The hydrogen given off is collected in a gas syringe. The total vo...

157.75 g of bismuth(III) chloride, BiCl₃, is used to make 500 cm³ of solution using distilled water. The aqueous bismuth(III) chloride slowly becom...

The flow chart shows some of the processes and reactions in the formation of ammonia. [Flow chart showing air → substance 2, process X → substance ...

Many reactions involve oxidation and reduction. Which statement is correct?

The equation for a reaction is shown. Cl₂ + 2KBr → 2KCl + Br₂ Which statement about this reaction is correct?

Which row describes both the pH and the ion with the greatest concentration in an aqueous alkali?

The water in a lake is acidic and the fish are dying. The water in the lake needs to be neutralised so that its pH is close to 7. Which compound is...

Which pair of reagents is used in a school laboratory to prepare a sample of pure barium sulfate?

The total number of electrons in one atom of element Q is 17 and in one atom of element R is 19. Which statement about elements Q and R is correct?

Which statements about the Group VIII noble gases are correct? 1 They are unreactive. 2 They all have a full outer shell of electrons. 3 They are a...

Iron has a high melting point. Which statement explains the high melting point of iron?

The table shows the reactions of four metals, P, Q, R and S, and their oxides. reaction with water reaction with dilute acid reaction of oxide with...

NPK fertilisers are used to improve plant growth. A solid NPK fertiliser has the properties listed: • water soluble • has an aqueous solution with ...

Alkanes are saturated compounds containing carbon and hydrogen only. Structures 1, 2, 3 and 4 are saturated hydrocarbons. [Diagrams of structures 1...

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

Which equations represent the reactions of alkanes? 1 CH₄ + Cl₂ → CH₂Cl₂ + H₂ 2 2C₂H₆ + 5O₂ → 4CO + 6H₂O 3 C₃H₈ + HCl → C₃H₇Cl + H₂

Ethanol is produced using either ethene or glucose as the starting material. Which row is correct?

The diagram shows four pieces of apparatus that are used to measure the volume of liquid. Which piece of apparatus is always filled to the same level?

The chromatogram shown is produced using a spot of black ink placed at point X. [Chromatogram showing chromatography paper, solvent front, baseline...

The table shows the results of a series of tests with two substances, X and Y. test result with X result with Y dilute nitric acid added no reactio...

Four gases are listed. 1 CH4 2 NH3 3 CO2 4 N2 What is the order of their rate of diffusion at room temperature and pressure?

Sodium is added to water and a chemical reaction occurs. Hydrogen and aqueous sodium hydroxide are produced. Which row describes the reactants and ...

An atom of element X is shown. Which element is X?