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Important Key Points in Chemistry for 2020 WASSCE Candidate

What will WAEC set from Chemistry in 2020? I won’t do much introduction in this article the title explains it all. Therefore, I am going to share with you important key points in chemistry for 2020 WAEC candidates.

Your Journey Determines the Vehicle You Enter. Now, take a glass of water and let me take you through Chemistry key point that would enable you to answer likely Chemistry WAEC questions in WAEC 2020.

  1. The most reactive metal known is Francium
  2. GEL is a SOL which contains more solid particle dispersed in liquid than usual
  3. The hardest substance known to man is DIAMOND
  4. The lowest Oxidation State of IRON is ZERO
  5. Quantum Numbers only describes ELECTRONS and not ATOMS
  6. Hydrogenation of Alkynes gives Alkanes
  7. The Law of Definite Proportion is also referred to as the Law of Costant Composition
  8. Sodium liberates H2 from Steam
  9. The electrolyte used in DOWN CELL is Molten NaCl fused with CaCl2
  10. Na is not stored under water because it Tarnishes
  11. Burning Kerosene gives CO2 + H2O
  12. Dissolution of Calcium in water gives CaO
  13. All Nitrates are Soluble in water. Also, all nitrates are unstable to heat
  14. N2O is the first Anesthetic man ever used
  15. The flame used by welders is called Oxy-acetylene flame
  16. Consecutive members of the Alkane homologous series differ by CH2
  17. The difference between drying and dehydration is that drying is removal of water while dehydration is the removal of element of water (Hydrogen and oxygen)
  18. Benzene is an Aromatic hydrocarbon
  19. Atomic mass is the number of proton and neutron in the nucleus of an atom
  20. Atomic number is the number of Proton an atom has
  21. Electrons revolve around the atom while proton and Neutron are inside the Nucleus of the tom
  22. Radioactivity is the spontaneous disintegration of the nuclei of an atom to emit energy and radiation such as ALPHA PARTICLES, BETA PARTICLES AND GAMMA RAYS
  23. Alpha particles have the least penetrating power. Beta particles can be stopped by Aluminum foil while Gamma rays can only be stopped by LEAD BLOCK
  24. The ability of CARBON to form long chains, branched chains and rings is called catenation
  25. Aliphatic Hydrocarbons could Cyclic, Acyclic or Alicyclic
  26. Pure substances have definite boiling point and melting point
  27. Example of radioactive material are Uranium, Thorium and Polonium
  28. The most notable scientist who contributed to the development of the Periodic Table between 1817 to 1895 was Dmitri T. Mendeleev
  29. The fourth and fifth period contains 18 elements each
  30. Elements in the same group are called CONGENERS
  31. Free Hydrogen (H2) is the lightest gas known
  32. Viscosity is the resistance to flow in liquids
  33. Water starts boiling when the saturated vapor pressure is equal to the atmospheric pressure
  34. Factors affecting boiling points of organic compounds are branching, volatility, polarity and impurity
  35. The most reactive nonmetal known is fluorine
  36. Impurity increases boiling point but reduces melting point
  37. Ernest Rutherford is the father of nuclear science
  38. Radioactivity can also be called transmutation
  39. NUCLEAR ENERGY is produced by Nuclear fission and Nuclear fusion
  40. Energy from the Sun is as a result of Nuclear fusion but reaches the earth via Radiation
  41. The two types of Radioactivity are natural radioactivity and artificial radioactivity
  42. Every nucleus is positive
  43. Reduction takes place in cathode and oxidation occurs in the anode
  44. Acheson process is used to produce Graphite
  45. Bessemer process is used for the production steel
  46. Alkanals can be oxidized but alkanones cannot, why? It is because alkanals have an oxidizable hydrogen atom attached to the carbonyl carbon but alkanones do not
  47. Water is not added to acid because it could cause an explosion. Addition of water of acid is violently exothermic
  48. Oxygen is the most abundant element in the earth crust
  49. Bunsen Burner is used for heating and for exposing items to flame
  50. Thermite process is used to welding broken ends of metal parts

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Question for you: What is the most reactive metal known?

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One Response

  1. Like!! Really appreciate you sharing this blog post.Really thank you! Keep writing.

    by ปั้มไลค์ on Jul 29, 2020 at 5:16 pm

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