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Final Revision Grade 10

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  • Find the approximate enthalpy change, ΔH:
    –137 kJ/mol
    +137 kJ/mol
    –124 kJ/mol
    - 400 kJ/mol
  • What is the enthalpy change (ΔH) for the reaction?
    –1200 kJ/mol
    –524 kJ/mol
    +890 kJ/mol
    –890 kJ/mol
  • What is oxidation?
    Loss of oxygen
    Gain of electrons
    Loss of electrons
  • Which is the correct reaction for complete combustion of ethane?
    Ethane + water → ethanol
    Ethane + oxygen → carbon monoxide + water
    Ethane → ethene + hydrogen
    Ethane + oxygen → carbon dioxide + water
  • What is the general formula for alkanes?
    CnH2n-2
    CnH2n
    CnHn
    CnH2n+2
  • A chemical reaction takes place in a closed system. What does this mean?
    No substances enter or leave
    No bonds are broken
    There is no activation energy
    Only exothermic reactions happen
  • What happens when ethene reacts with bromine water?
    Yellow to red
    Orange to colourless
    Colourless to orange
    Blue to green
  • A reaction that shows a steep curve at the start on a rate graph is:
    Constant
    Slow
    Fast
    Reversible
  • Which fraction has the lowest boiling point?
    Fuel oil
    Bitumen
    Diesel
    Refinery gas
  • Which catalyst is used in the Contact Process?
    Iron
    Vanadium(V) oxide (V₂O₅)
    Nickel
    Platinum
  • If the energy required to break bonds is more than energy released in forming bonds, the reaction is:
    Spontaneous
    Endothermic
    Exothermic
    Neutral
  • Which fraction has the highest boiling point?
    Refinery gas
    Petrol
    Kerosene
    Bitumen
  • Activation energy is defined as:
    Energy needed to cool down a reaction
    Energy given out in a bond
    Minimum energy required to start a reaction
    Energy released during a reaction
  • Find the enthalpy change, ΔH:
    +184 kJ/mol
    –122 kJ/mol
    –184 kJ/mol
    –400 kJ/mol
  • What are the optimum conditions for the Haber Process?
    600°C, 1 atm, platinum catalyst
    Room temperature and pressure, iron catalyst
    100°C, 200 atm, iron catalyst
    450°C, 200 atm, iron catalyst
  • Which of the following is an example of an endothermic process?
    Neutralisation
    Photosynthesis
    Respiration
    Combustion
  • In bond energy calculations, bond forming is:
    Random
    Zero
    Exothermic
    Endothermic
  • Why does increasing concentration increase rate?
    Reactants are heavier
    Lower bond energy
    Temperature drops
    More frequent collisions
  • Find ΔH:
    –50 kJ/mol
    - 366 kJ/mol
    +127 kJ/mol
    –127 kJ/mol
  • Isomers have:
    Same formula, different structure
    Same properties
    Same boiling point
    Same structure, different formula
  • What is the symbol for enthalpy change?
    He
    H∆
    Ea
    ΔH
  • In bond energy calculations, bond breaking is:
    Spontaneous
    Always neutral
    Endothermic
    Exothermic
  • Alkenes are more reactive than alkanes because:
    They are saturated
    They contain a double bond
    They have more hydrogen
    They are longer molecules
  • Which of the following is an unsaturated hydrocarbon?
    Alkane
    Alkene
    Propane
    Alcohol
  • What is the enthalpy change?
    +89 kJ/mol
    –299 kJ/mol
    –125 kJ/mol
    –89 kJ/mol
  • In a redox reaction, which element is reduced?
    One that gives off hydrogen
    One that reacts with oxygen
    One that gains electrons
    One that loses electrons
  • How does a catalyst affect a reaction?
    Makes bonds stronger
    Increases temperature
    Lowers activation energy
    Adds energy
  • Which hydrocarbon decolourises bromine water?
    Ethane
    Methane
    Ethene
    Propane
  • Which factor does not affect the rate of reaction?
    Concentration
    Colour of reactants
    Surface area
    Temperature
  • What are the raw materials used in the Haber Process?
    Nitrogen and oxygen
    Ammonia and hydrogen
    Carbon dioxide and hydrogen
    Nitrogen and hydrogen
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