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Which statement about gases is correct?
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A sample of argon gas is heated in a closed container. Which row describes what happens to the pressure and the size of the argon atoms? [Table_1]
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Which statement is correct?
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Which row identifies methods of testing the purity of a compound? [Table_1]
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Which row shows the number of protons, neutrons and electrons in the ion $^{18}_{8}\text{O}^{2-}$? [Table_1]
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Isotopes of the same element have some features that are the same and some that are different. Which row shows the features that are the same and those that are different? [Table_1]
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The electronic configurations of four atoms, W, X, Y and Z, are shown. [Table_1] Which atoms form an ion with a charge of 2- when they react?
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Which statement about bonding is correct?
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Which statement about diamond is correct?
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Which row shows the correct formulae of lead(II) bromide and butane? [Table_1]
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Calcium phosphate forms when calcium chloride and sodium phosphate solutions react together.
$x \text{ } CaCl_2 + y \text{ } Na_3PO_4 \rightarrow 2Ca_3(PO_4)_2 + 12NaCl$
Which values of $x$ and $y$ balance the equation?
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What is the definition of relative molecular mass, $M_r$?
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In an experiment, a molten compound is broken down using electricity.
Which row identifies the negative electrode and the general name for the molten compound being broken down?
[Table_1]
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Hydrogen–oxygen fuel cells can be used to power vehicles. What is produced by the fuel cells? 1. carbon dioxide 2. electricity 3. water
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Three reactions are described.
1. An acid is added to substance H. Rapid fizzing happens and the temperature decreases.
2. When substance J is ignited, it produces large quantities of heat.
3. Substance K reacts slowly with air and becomes warmer.
Which reactions are endothermic?
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Which of the processes produces a physical change?
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A known mass of gaseous ammonia and excess gaseous hydrogen chloride react together to make solid ammonium chloride. Line X shows the total mass of ammonium chloride produced over time. The reaction is repeated at a higher pressure. All other conditions are kept the same. Line Y shows the total mass of ammonium chloride produced over time at the higher pressure. Which diagram is correct?
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The equation for the hydration of anhydrous copper(II) sulfate is shown. $$\text{CuSO}_4 + 5\text{H}_2\text{O} \to \text{CuSO}_4\cdot 5\text{H}_2\text{O}$$ Which colour change is observed in this reaction?
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Which of the reactions show the underlined substance being reduced?
1. \underline{\text{CuO}} + \text{H}_2 \rightarrow \text{Cu} + \text{H}_2\text{O}
2. \underline{2\text{Mg}} + \text{O}_2 \rightarrow 2\text{MgO}
3. \text{MgO} + \underline{2\text{HCl}} \rightarrow \text{MgCl}_2 + \text{H}_2\text{O}
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Four different solutions are separately tested with blue litmus and with methyl orange. Each solution is known to be either acidic or alkaline. The results are shown.
[Table_1]
Which statement is correct?
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Which statement about sulfur dioxide or calcium oxide is correct?
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Which substances can be used to make pure crystals of sodium sulfate?
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Which statements describe changes that occur from left to right across a period of the Periodic Table?
1. The atomic number of the elements increases.
2. The metallic character of the elements decreases.
3. The physical state of the elements changes from gas to solid.
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Part of the Periodic Table is shown. Which element is the most reactive non-metal?
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An alloy contains aluminium, copper, magnesium, manganese, silver and zirconium. Which row identifies the number of transition elements in the alloy and the relative density of the transition elements compared to sodium? [Table_1]
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Which statement about the halogens and their compounds is correct?
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Which row describes an element in Group VIII of the Periodic Table? [Table_1]
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Magnesium reacts with dilute hydrochloric acid. Which gas is given off in this reaction?
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Which statement about aluminium is correct?
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Which statement shows that a liquid is pure water?
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Which compound can be added to ammonium sulfate to make an NPK fertilizer?
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Four gases found in air are listed.
1. carbon dioxide
2. carbon monoxide
3. methane
4. sulfur dioxide
Which gases lead directly to global warming when their concentrations are increased?
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The structures of four organic compounds are shown.
Which compounds are members of the same homologous series?
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Which of the statements about propene are correct? 1. Propene contains only single bonds. 2. Propene decolourises aqueous bromine. 3. Propene is obtained by cracking large alkanes. 4. Propene is a hydrocarbon.
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Petroleum is a mixture. Which method is used to separate petroleum into its components?
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The equation for a reaction that produces ethanol is shown.\[\text{ethene} + \text{steam} \rightarrow \text{ethanol}\]Which type of reaction does the equation represent?
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Four statements about ethene or poly(ethene) are listed.
1. Poly(ethene) is produced by an addition reaction.
2. Ethene is a monomer.
3. Poly(ethene) is a monomer.
4. Poly(ethene) decolourises aqueous bromine.
Which statements are correct?
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Sea water contains dissolved sodium chloride. Which method is used to obtain pure water from sea water?
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Which piece of apparatus is used to measure exactly 21.4 cm$^3$ of water?
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An aqueous solution of compound M is tested.
The results are shown.
• a lilac colour in a flame test
• a white precipitate when tested with acidified barium nitrate
What is compound M?
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