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A gas is released at point X in the apparatus shown.
Which gas turns the damp Universal Indicator paper red most quickly?
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A chromatography experiment was done to separate a mixture of four substances.
The $R_f$ values measured for these substances were 0.3, 0.5, 0.8 and 0.8.
Which diagram shows the chromatogram obtained?
[Image_1: Diagram with labels A, B, C, D, solvent front, and baseline]
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Which piece of apparatus cannot be used to collect and measure the volume of gas produced in an experiment?
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The 'lead' in a pencil is made of a mixture of graphite and clay.
When the percentage of graphite is increased, the pencil slides across the paper more easily.
Which statement explains this observation?
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Which pair shows particles with the same chemical properties?
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The equation for the reaction between potassium carbonate and nitric acid is shown.
$K_2CO_3 + 2HNO_3 \rightarrow 2KNO_3 + H_2O + CO_2$
Which volume of carbon dioxide is produced from 69 g of potassium carbonate?
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A solution of sodium carbonate, $\text{Na}_2\text{CO}_3$, has a concentration of 0.03 mol/dm$^3$.
Which mass of sodium carbonate is dissolved in 1 dm$^3$ of this solution?
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Aqueous copper(II) sulfate is electrolysed using copper electrodes.
Which statement about the electrolysis is not correct?
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Dilute sulfuric acid is electrolysed using inert electrodes. What are the ionic half-equations for the reactions that take place at each electrode?
[Table_1]
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Which diagram is a correctly labelled energy level diagram for an endothermic reaction?
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The equation for the complete combustion of methane is shown.
$$\text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(g)$$
The bond energies are shown in the table.
[Table_1]
What is the energy change for the reaction?
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Which row describes the effects of increasing both concentration and temperature on the collisions between reacting particles? [Table_1]
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Sulfur dioxide reacts with oxygen at 2 atmospheres pressure. The forward reaction is exothermic.
The equation for the reaction is shown.
2SO2(g) + O2(g) ⇌ 2SO3(g)
The reaction reaches equilibrium. The pressure is then doubled.
How and why does the amount of sulfur trioxide formed change?
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Iron(II) chloride solution reacts with chlorine gas. The equation is shown.
$2FeCl_2(aq) + Cl_2(g) \rightarrow 2FeCl_3(aq)$
Which statements about this reaction are correct?
1. $Fe^{2+}$ ions are reduced to $Fe^{3+}$ ions.
2. Chlorine acts as a reducing agent.
3. $Fe^{2+}$ ions each lose an electron.
4. $Cl_2$ molecules are reduced to $Cl^-$ ions.
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Which statement about acids and bases is correct?
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The solubility of some salts is shown:
[Table_1]
Which two aqueous solutions produce an insoluble salt when mixed together?
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Which methods are suitable for preparing both zinc sulfate and copper(II) sulfate?
1. reacting the metal oxide with warm dilute aqueous sulfuric acid
2. reacting the metal with dilute aqueous sulfuric acid
3. reacting the metal carbonate with dilute aqueous sulfuric acid
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Which statement about the Periodic Table is correct?
549
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Chlorine, bromine and iodine are elements in Group VII of the Periodic Table. Which statement about these elements is not correct?
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Which row describes the properties of a transition element?
[Table_1]
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Stainless steel is an alloy of iron, carbon, and other metals.
Which row is correct?
[Table_1]
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Metal X is more reactive than metal Y. Metal Y is more reactive than metal Z.
Which statement is correct?
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Which statement about the industrial extraction of zinc is correct?
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Which row describes the use of an alloy and the property upon which the use depends? [Table_1]
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Dry air is passed over hot copper until all the oxygen has reacted.
The volume of gas at the end of the reaction is 120 cm³.
What is the starting volume of dry air?
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A steel bicycle which had been left outdoors for several months was starting to rust. What would not reduce the rate of corrosion?
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Which statements about water are correct?
1. Household water contains dissolved salts.
2. Water for household use is filtered to remove soluble impurities.
3. Water is treated with chlorine to kill bacteria.
4. Water is used in industry for cooling.
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Ammonia is manufactured by reacting hydrogen with nitrogen in the Haber process.
Which row describes the sources of hydrogen and nitrogen and the conditions used in the manufacture of ammonia in the Haber process?
[Table_1]
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Which statements about the carbon cycle are correct?
1. Carbon dioxide is added to the atmosphere by respiration.
2. Carbon dioxide is added to the atmosphere by combustion of coal.
3. Carbon dioxide is removed from the atmosphere by photosynthesis.
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Which row describes the uses of sulfur and sulfur dioxide?
[Table_1]
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Limestone is used in many industrial processes. In which process is it not used?
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What is not the correct use of the fraction named?
[Table_1]
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Which statement about alkenes is not correct?
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Which substances can be obtained by cracking hydrocarbons?
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Two processes used for the large-scale production of ethanol are shown.
process 1: A compound containing carbon, hydrogen and oxygen is used to produce ethanol.
process 2: A compound containing carbon and hydrogen only is used to produce ethanol.
Which statement is correct?
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What is the name of the organic product of the reaction shown?
$\text{CH}_3\text{COOH} + \text{CH}_3\text{CH}_2\text{OH} \rightarrow$
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Which two compounds react together to form a condensation polymer?
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