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Nitrogen is heated in a balloon, which expands slightly. Which statements about the molecules of nitrogen are correct? 1. They move further apart. 2. They move more quickly. 3. They remain the same distance apart. 4. Their speed remains unchanged.
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The diagrams represent some elements, compounds and mixtures. Which row describes the numbered substances? [Table_1]
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Two atoms, X and Y, have the same mass number but different atomic numbers. Which statement about X and Y is correct?
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The symbols for two different isotopes of element S are shown. $$^{m}_{n}S \quad \text{and} \quad ^{p}_{q}S$$ The letters m, n, p and q represent whole numbers. Which statements about the values of m, n, p and q are correct? 1. $m = p$ 2. $n = q$ 3. $m > q$
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Which statement about potassium fluoride is correct?
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In which molecule are all the outer-shell electrons involved in covalent bonding?
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What is the formula of potassium oxide?
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The compound magnesium nitrate has the formula Mg(NO_3)_2. What is the relative formula mass of magnesium nitrate?
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Dilute sulfuric acid is electrolysed using inert electrodes. What is produced at the anode?
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The flow diagram represents a hydrogen–oxygen fuel cell. Which row shows the inputs and outputs? [Table_1]
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Which statement describes an exothermic reaction?
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Which row shows the changes that all increase the rate of a chemical reaction? [Table_1]
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A student heats hydrated copper(II) sulfate. The blue crystals change to a white powder. How can the student reverse this reaction?
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Acidified aqueous potassium manganate(VII) is a purple solution. What does the (VII) in the name potassium manganate(VII) represent?
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Excess hydrochloric acid is added to aqueous sodium hydroxide containing thymolphthalein. Which colour change is observed?
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Information about four oxides, J, K, L and M, is listed.
J releases ammonia when added to aqueous ammonium chloride.
K reacts with aqueous sodium hydroxide.
L is the oxide of a Group I element.
M is an oxide of an element in the top right section of the Periodic Table.
Which row is correct? [Table_1]
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Three methods of preparing salts are listed.
1. acid + metal
2. acid + metal carbonate
3. acid + metal oxide
Which methods can be used to make copper(II) chloride?
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Which set of elements shows the change from metallic to non-metallic character across a period of the Periodic Table?
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The diagram shows the reaction that occurs when potassium is dropped into water. $$2K + 2H_2O \rightarrow 2KOH + H_2$$ Which row is correct? [Table_1]
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Which statement about bromine is correct?
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What is a typical property of transition elements?
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Which description of elements in Group VIII of the Periodic Table is correct?
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The flow chart shows some properties of four solid elements. Which elements are non-metals?
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Which statement about copper or aluminium is correct?
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Water from a reservoir flows to the water works where purification process 1 takes place followed by process 2. What are processes 1 and 2?
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Calcium reacts with cold water to produce hydrogen. Lead reacts slowly when heated in air to form an oxide but has almost no reaction with steam. Silver does not react with either air or water. Zinc reacts when heated with steam to produce hydrogen. What is the order of reactivity starting with the least reactive? [Table_1]
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Which statement about rusting is correct?
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Which statements about the extraction of iron in a blast furnace are correct?\n1. The temperature inside the blast furnace is increased by burning carbon.\n2. Iron(III) oxide is reduced to iron by carbon monoxide.\n3. The thermal decomposition of calcium carbonate forms slag.\n4. Slag reacts with acidic impurities.
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Which statements about water are correct? 1. Tap water has fewer impurities than distilled water. 2. Tap water will turn anhydrous cobalt(II) chloride pink. 3. The domestic water supply is treated with carbon to kill microbes. 4. Phosphates from fertilisers can cause deoxygenation of water.
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Which substance is used by farmers to improve plant growth?
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Three air pollutants, X, Y and Z, are described.
X is a toxic gas formed by the incomplete combustion of an alkane.
Y is formed by decomposing vegetation and increases global warming.
Z is a cause of breathing problems and acid rain.
Which pollutants are X, Y and Z?
[Table_1]
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The displayed formula of an organic compound is shown. To which homologous series does this compound belong?
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Kerosene is one of the fractions of petroleum. What is kerosene used for?
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A hydrocarbon P is cracked to make compound Q and hydrogen.
Compound R is formed by the addition polymerisation of compound Q.
To which homologous series do P, Q and R belong?
[Table_1]
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Which process involves combustion? (Some of the reaction products are \textit{not} shown on the diagram.)
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What are the products when ethanoic acid reacts with aqueous sodium hydroxide?
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Which statements are correct?
1. The polymer of ethene is poly(ethane).
2. Monomers are small molecules.
3. Monomers join together to form polymers.
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Dilute hydrochloric acid is titrated into a conical flask containing sodium hydroxide solution and a few drops of methyl orange indicator.
Which piece of apparatus is used to add the hydrochloric acid?
561
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What could be the melting point and boiling point of water containing a dissolved impurity? [Table_1]
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Element X burns in air to form an acidic gas that decolourises potassium manganate(VII). What is X?
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