No questions found
In which changes do the particles move further apart?
[Image showing transitions: W arrow Y gas, Y arrow W liquid, X arrow Z solid]
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In the chromatography experiment shown, which label represents the solvent front?
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One of the instructions for an experiment reads as follows.
Quickly add 50 cm$^3$ of acid.
What is the best piece of apparatus to use?
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Two statements about diamond are given.
1. Diamond has a giant three-dimensional covalent structure of carbon atoms.
2. Diamond is one of the hardest substances known.
Which is correct?
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The table shows the electronic structure of four atoms.
[Table_1]
Which two atoms combine to form a covalent compound?
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An atom of element Q contains 19 electrons, 19 protons and 20 neutrons.
What is Q?
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Lithium is in Group I of the Periodic Table. Nitrogen is in Group V of the Periodic Table. Lithium reacts with nitrogen to form the ionic compound lithium nitride. What happens to the electrons when lithium atoms and nitrogen atoms form ions? [Table_1]
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The equation shows the reaction between magnesium and sulfuric acid. [Ar: H, 1; O, 16; Mg, 24; S, 32]
$$\text{Mg} + \text{H}_2\text{SO}_4 \rightarrow \text{MgSO}_4 + \text{H}_2$$
In this reaction, which mass of magnesium sulfate is formed when 6g of magnesium react with excess sulfuric acid?
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The diagram shows an electrical cable. Which statement about the substances used is correct?
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What are the products at the electrodes when dilute sulfuric acid is electrolysed using inert electrodes?
[Table_1]
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The energy level diagram for the reaction between magnesium and hydrochloric acid is shown.
Which statement about the reaction is not correct?
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The diagram shows some properties that substances may have.
To which labelled part of the diagram does $^{235}\text{U}$ belong?
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A liquid X reacts with solid Y to form a gas.
Which two diagrams show suitable methods for investigating the rate (speed) of the reaction?
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The results of two separate reactions between excess calcium carbonate and hydrochloric acid are shown.
Which statement explains the differences between the reactions?
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The equations below all show redox reactions.
$$\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2$$
$$2\text{ZnO} + \text{C} \rightarrow 2\text{Zn} + \text{CO}_2$$
$$\text{Fe}_2\text{O}_3 + 2\text{Al} \rightarrow \text{Al}_2\text{O}_3 + 2\text{Fe}$$
$$2\text{CO} + 2\text{NO} \rightarrow 2\text{CO}_2 + \text{N}_2$$
Which oxide is oxidised in these reactions?
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In which reaction is the colour change from blue to white?
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Which statements are properties of an acid?
1. reacts with ammonium sulfate to form ammonia
2. turns red litmus blue
[Table_1]
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Part of the Periodic Table is shown.
Which element forms an acidic oxide?
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What is the correct sequence of steps for the preparation of a pure sample of copper(II) sulfate crystals from copper(II) oxide and sulfuric acid?
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The following tests are carried out on an aqueous solution of salt X.
[Table_1]
What is X?
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Where in the Periodic Table is the metallic character of the elements greatest? [Table_1]
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Rubidium is a Group I metal.
Which statement about rubidium is not correct?
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The table gives information about four elements, P, Q, R and S.
[Table_1]
Which elements could be transition elements?
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Part of the Periodic Table is shown. Which element is a gas that does not form a compound with potassium?
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Which property is not considered a typical metallic property?
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Some chemical properties of three metals W, X, and Y and their oxides are shown.
[Table_1]
What is the order of reactivity of these metals, most reactive first?
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Iron from a blast furnace is treated with oxygen and with calcium oxide to make steel. Which substances in the iron are removed? [Table_1]
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Copper is sometimes used to make cooking utensils.
Three properties of copper are given.
1 corrosion resistant
2 good conductor of electricity
3 good conductor of heat
Which properties make copper a suitable metal for making cooking utensils?
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The diagram shows an experiment to investigate how paint affects the rusting of iron.
What happens to the water level in tubes P and Q?
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A new planet has been discovered and its atmosphere has been analysed.
The table shows the composition of its atmosphere.
[Table_1]
Which gases are present in the atmosphere of the planet in a higher percentage than they are in the Earth's atmosphere?
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Which of the following are tests for water?
1. It turns anhydrous copper(II) sulfate blue.
2. It boils at 100°C.
3. It turns anhydrous cobalt(II) chloride paper blue.
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Sulfur dioxide, carbon monoxide and oxides of nitrogen are common gaseous pollutants found in the air. Which pollutants contribute to acid rain?
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Which compound is not used as a fertiliser?
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Lime (calcium oxide) is used to treat waste water from a factory.
Which substance is removed by the lime?
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The diagram shows the separation of petroleum into fractions.
What could X, Y and Z represent?
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Which compound is not an alkane, $C_nH_{2n+2}$?
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A hydrocarbon W burns to form carbon dioxide and water. W decolourises bromine water.
What is the name of W and what is its structure?
[Table_1: Contains options with hydrocarbon names and structures]
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Which term describes the formation of ethanol from glucose?
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Ethene forms an addition polymer as shown.
Which terms describe this polymer?
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Which statement about carboxylic acids is not correct?
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