Chemical Changes

    Cards (83)

    • Are all metals found in the ground as ores?

      No
    • Are metals below carbon in the reactivity series, extracted by reduction using carbon?

      Yes
    • Iron reacts with oxygen to form iron oxide. What kind of reaction is this?
      Oxidation
    • What is the difference between the concentration of hydrogen ions between two solutions of pH2 and pH3?
      The solution with a pH of 2 has more hydrogen ions than the solution with a pH of 3 by a factor of 10.
    • Do hydroxide ions make solutions acidic?
      No
    • How can a solid be obtained from a salt solution
      By crystallisation of the salt solution
    • Name the 2 products formed in the reaction between hydrochloric acid and copper oxide
      • Copper Chloride
      • Water
    • An electrolysis cell has two electrodes. What is the name of the positive electrode?
      Anode
    • An electrolysis cell has two electrodes. What is the name of the negative electrode?
      Cathode
    • In electrolysis, which direction do the electrons travel?
      From the anode to the cathode
    • Electrolyte
      What is the name of the liquid indicated by the letter A on the diagram?
    • Which ions are attracted to the negative electrode (cathode) during electrolysis?
      Positive ions
    • Which ions are attracted to the positive electrode (anode) during electrolysis?
      Negative ions
    • What are the electrodes in an electrolysis cell are normally made of?
      Inert carbon
    • Electrodes in an electrolysis cell are normally made of inert carbon. What does inert mean?
      It is unreactive so it will not take place in the reaction.
    • In electrolysis, is the ion that gains electrons oxidised or reduced?
      Reduced
    • In electrolysis, is the ion that loses electrons oxidised or reduced?
      Oxidised
    • In the electrolysis of molten lead bromide, what is the product at the anode?
      Bromine
    • What is oxidisation?
      Loss of electrons.
    • What is reduction?
      Gain of electrons.
    • In electrolysis, why does the compound you are trying to separate need to be molten or dissolved?
      So that the ions are free to move
    • Cathode
      What is the name of the object indicated by the letter B?
    • Anode
      What is the name of the object indicated by the letter E?
    • In electrolysis, which electrode would chloride ions (Cl-) be attracted to?
      Anode
    • What chemical processes are used to extract metals from their ores?
      Electrolysis and reduction by carbon
    • How is a metal extracted from a metal compound using electrolysis?
      A compound is split into its elements using electricity
    • Why is electrolysis not used to extract all metals?
      Electrolysis is expensive because it requires a large amount of electricity
    • When should a metal be extracted by carbon reduction?
      When the metal is less reactive than carbon
    • Which method of metal extraction would be used to extract potassium?
      Electrolysis
    • Which method of metal extraction would be used to extract calcium?
      Electrolysis
    • Which method of metal extraction would be used to extract magnesium?
      Electrolysis
    • Which method of metal extraction would be used to extract aluminium?
      Electrolysis
    • Which method of metal extraction would be used to extract zinc?
      Reduction by carbon
    • Which method of metal extraction would be used to extract iron?
      Reduction by carbon
    • Which method of metal extraction would be used to extract tin?
      Reduction by carbon
    • Which method of metal extraction would be used to extract lead?
      Reduction by carbon
    • Which method of metal extraction would be used to extract copper?
      It is found native.
    • Which method of metal extraction would be used to extract gold?
      It is found native.
    • Which method of metal extraction would be used to extract silver?
      It is found native.
    • List the reactivity series from most reactive to least:
      • Potassium
      • Sodium
      • Calcium
      • Magnesium
      • Aluminium
      • Carbon
      • Zinc
      • Iron
      • Tin
      • Lead
      • Hydrogen
      • Copper
      • Silver
      • Gold
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