Chemistry Experiments and important reactions —— Electrical chemistry

Index

  • Chromatography
  • Common experiments operations
  • Tests for ions and gases
  • Extraction of metals
  • Electrical chemistry
  • Haber process
  • Contact process
  • Carbon cycle
  • Purification of water
  • Addition reaction
  • Substituion reaction
  • Methods to produce ethanol
  • Cracking of organic compounds
  • Fractional distillation of petrol
  • Polymerization

Electrical chemistry

Eletrical cell

Electrical cell

  • In electrical cell, anode is the negative electrode while cathode is the positive electrode
  • The electrons transfer from anode to cathode
  • The more reactive metal is usually anode
  • Exothermic redox reaction must occur in electrical cell

Electrolysis

Electrolysis

  • Usually, in electrolysis, anions will be attracted to anode and cations will be attracted to cathode
  • The more important thing is the discharging series for cations and anions
    • Cations(Cathode)
      • Ag > Hg > Fe(III) > H > Pb > Sn > Fe(II) > Zn > H(water) > Al >Mg > Ca > Na > K
    • Anions(Anode)
      • S > I > Br > Cl > OH > -ate > F
  • Also, concentration of ions can also influence its product

Electroplating / Refining metals

Electroplating

  • Electroplating is used to coat metals like iron, which can improve its ability to prevent from corrosion
  • There is not a full reaction happens when elctroplating or refining metals
  • There are only eletrons transferring in the circuit