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CfE Higher Chemistry - Unit 1 Revision

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  • An increase in temperature ....
    increases the energy released in a reaction
    increases the activation energy
    increases the average kinetic energy of the reactants
    lowers the activation energy
  • Exothermic reactions ...
    always have a + enthalpy change
    are always reversible
    are not reversible
    always have a - enthalpy change
  • Which of the following is least likely to dissolve in petrol (C8H16)?
    CO<sub>2</sub>
    I<sub>2</sub>
    NaCl
    C<sub>5</sub>H<sub>12</sub>
  • Which of the following is required for a successful collision?
    energy lower than the activation energy
    a large surface area
    the correct geometry
    a high concentration
  • The bonding and structure in the element sulphur is ....
    covalent molecular
    monatomic
    metallic
    covalent network
  • The enthalpy change for a reaction is calculated from.....
    the difference between the product and highest peak energy
    the difference between the reactant and product energy
    the energy of the highest peak
    the difference between the reactant and highest peak energy
  • A chemical reaction took 10 seconds to end. The rate of this reaction is ...
    10 s<sup>-1</sup>
    0.1 s
    10 s
    0.1 s<sup>-1</sup>
  • The bonding and structure in the compound silicon dioxide is ....
    covalent network
    monatomic
    covalent molecular
    metallic
  • Elements with the lowest electronegativity are found ...
    At the botttom left of the Periodic Table
    At the top right of the Periodic Table
    At the bottom right of the Periodic Table
    At the top left of the Periodic Table
  • The activation energy for a reverse reaction is calculated from.....
    the difference between the product and highest peak energy
    the difference between the reactant and product energy
    the energy of the highest peak
    the difference between the reactant and highest peak energy
  • The bonding and structure in the element helium is ....
    metallic
    covalent molecular
    covalent network
    monatomic
  • The bonding and structure in the element carbon (as graphite) is ....
    monatomic
    metallic
    covalent network
    covalent molecular
  • Which of the following molecules are polar?
    NH<sub>3</sub>
    CF<sub>4</sub>
    CH<sub>4</sub>
    CO<sub>2</sub>
  • When reactants lose energy to form products, which of the following must be true?
    the reaction is exothermic
    the activation energy is very low
    the activation energy is high
    the reaction is endothermic
  • Which of following is not likely to have a significant effect on the rate of a reaction?
    volume/mass of reactants
    surface area of reactants
    concentration of reactants
    temperature of reactants
  • Which of the following is incorrect about the activation energy
    it is the energy required to form the activated complex
    it can sometimes be negative
    it is the minimum kinetic energy needed to start a reaction
    it is lowered by the addition of a catalyst
  • Which of these forces are weakest?
    Permanent dipole - permanent dipole
    London dispersion
    hydrogen bond
    ionic bond
  • An increase in which of the following will have the largest impact on reaction rate?
    temperature
    surface area
    pressure
    concentration
  • A chemical reaction had a relative rate of 0.25 min-1. How long did the reaction take to end?
    25 mins
    0.25 mins
    40 mins
    4 mins
  • The bonding and structure in the element tin is ....
    covalent molecular
    metallic
    monatomic
    covalent network
  • Which of the following does not increase across a period?
    ionisation energy
    strength of London dispersion force
    atomic size
    nuclear charge
  • Which of the following does not contain pure covalent bonding?
    chlorine
    nitrogen chloride
    hydrogen chloride
    hydrogen
  • Which of the following compounds is likely to be most ionic?
    Caesium fluoride
    Lithium fluoride
    Potassium fluoride
    Sodium fluoride
  • The anomalous density of ice (less than liquid water) is best described due to ...
    Permanent dipole-permanent dipole attractions
    The low polarity of the molecules
    London dispersion forces
    Hydrogen bonding between molecules
  • The melting point of group 0 elements increases down the group. This is because...
    Hydrogen bond increases
    Temporary dipoles increase in strength
    The atoms weigh more
    The atoms become less reactive
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