Unclassified
34 past-paper questions on Unclassified · examined 2020–2025.
20256 questions
1 The pressure of a sample of air is reduced and its temperature remains constant. Which row describes the changes in the volume of the air and the distance between the particles in the air? volume of air distance between the particles in the air A decreases decreases B decreases increases C increases decreases D increases increases
22 Chlorine gas is bubbled into separate samples of aqueous potassium iodide and aqueous potassium bromide. In which solutions is there a colour change? aqueous potassium iodide aqueous potassium bromide A key B = yes C = no D
© UCLES 2025 5070/11/O/N/25 [Turn over 28 Which substance is used to remove odours in the treatment of the domestic water supply? A carbon B chlorine C fluorine D silver 12
30 How many structural isomers are there with the molecular formula C4H9C l ? A 2 B 3 C 4 D 5
© UCLES 2025 5070/11/O/N/25 33 Which equation represents the reaction of ethane with chlorine in the presence of ultraviolet light? A CH3CH3 + C l 2 CH3CH3C l + C l B CH3CH3 + C l 2 CH3CH2C l + HC l C CH3CH3 + C l 2 CH2C l CH2C l + H2 D CH3CH3 + C l 2 CH2CH2 + 2HC l 13
37 Which diagram shows a measuring cylinder? A B C D
20232 questions
1 In a change of state at constant temperature and pressure: ● energy is released as stronger forces of attraction form between the particles ● the average distance between the particles changes very little. Which change of state is being described? A gas to liquid B liquid to gas C liquid to solid D solid to liquid
27 The equations for some of the reactions of metals Q, R and T are shown. 2QNO3(aq) + Cu(s) 2Q(s) + Cu(NO3)2(aq) R(s) + TSO4(aq) T(s) + RSO4(aq) T(s) + H2SO4(aq) TSO4(aq) + H2(g) Using the equations, what is the order of reactivity of Q, R and T? most reactive least reactive A Q T R B R Q T C R T Q D T R Q
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