2018 O Level Pure Chemistry Paper 1 — All Solutions

Under the same conditions, which gas diffuses at the same rate as nitrogen gas?…

The diagram shows the results of a chromatography experiment to identify the dyes present in a sample of ink. Which two …

Two solutions, W and X, were tested as shown. What are solutions W and X?…

An experiment is done to determine the rate of reaction of an ester with sodium hydroxide. CH₃CO₂C₂H₅ + NaOH → CH₃CO₂Na …

Which statement about atoms is correct?…

A substance has a high melting point. When solid, it does not conduct electricity but when molten, it does conduct. Whic…

A compound contains two elements, metal Y and non-metal Z. The compound consists of a lattice of positive ions and negat…

How many covalent bonds are there in the molecule with the formula CH₂CHCH₃?…

Copper is a metal. The structure of copper is described as a lattice of positive ions in a 'sea of electrons'. Which sta…

Which reaction takes place when combustion pollutants are removed in a catalytic converter?…

Sodium hydroxide reacts with sulfuric acid. The equation for the reaction is shown. 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O Which …

Bromobutane, C₄H₉Br, can be made from butanol using the reaction shown. C₄H₉OH + HBr → C₄H₉Br + H₂O In an experiment, 10…

In the diagram, each cell contains an aqueous solution of a single salt. All four electrodes are platinum. Electrodes Q …

Four electrolytes are listed. Each is electrolysed using inert electrodes. 1 aqueous copper(II) bromide 2 concentrated a…

What happens to the ions that move to the negative electrode during the electrolysis of molten potassium iodide?…

The complete combustion of ethane is an exothermic reaction. Which statement explains this?…

When steam is passed through excess hot coke a reaction occurs and the coke cools. C(s) + H₂O(g) → CO(g) + H₂(g) The act…

The energy profile diagram for a given reaction without the use of a catalyst is shown below. Which energy profile diagr…

1 mol of X reacts with 1 mol of Y to produce a gas. A student investigates the rate of this reaction by measuring the vo…

In which reactions is reduction taking place? 1 the conversion of nitrogen to ammonia in the Haber process 2 the formati…

The reaction in which the same element is both oxidised and reduced is called a disproportionation reaction. Which equat…

The table gives some statements about acids and bases and explanations for these statements. Which row shows both a corr…

Which pair of reagents would be most suitable to safely prepare a pure sample of potassium chloride in the laboratory?…

Methylamine dissolves in water to give an alkaline solution. A few drops of Universal Indicator are added to an aqueous …

Some properties of elements in the same group of the Periodic Table are listed. 1 charge on the ion 2 number of outer sh…

Part of the Periodic Table is shown. Which of the elements W, X, Y and Z would react together least violently?…

Which of the properties listed will a typical transition element have? 1 a high density 2 a high melting point 3 variabl…

Which statement about alloys is correct?…

Pieces of lead, magnesium, iron and an unknown metal, X, were placed separately in test-tubes containing aqueous solutio…

In the experiment shown, steam is passed over a heated solid P. Gas Q is collected. What are substances P and Q?…

Metals are found naturally as the metal or as metal compounds. The metal compounds can be reduced to the metal using car…

Ships made from steel often have pieces of magnesium attached to them to protect the steel from corrosion. Which equatio…

100 cm³ of methane is burned in 150 cm³ of oxygen. When cooled to room temperature, what could be the resulting mixture …

An equation for respiration is shown. C₆H₁₂O₆ + 6O₂ → 6H₂O + 6CO₂ ΔH = −2830 kJ/mol What can be deduced from the equat…

What will propanol, C₃H₇OH, form on complete oxidation?…

Which equation for the complete combustion of butane is correct?…

Which displayed formula represents the product of the reaction between propene and bromine?…

The preparations of three substances are given. 1 an ester from an alcohol and a carboxylic acid 2 ethanol from ethene 3…

An alcohol and a carboxylic acid are reacted together to form an ester. Which statement is correct?…

The structures of two compounds, X and Y, are shown. Which statements are correct? 1 Both X and Y contain four carbon at…