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50 must know chemistry topics Empty 50 must know chemistry topics

on Sat Dec 01, 2018 9:26 pm
A full summary of chemistry topics
By ojuye kenneth December 01, 2018 No comments
*_Key Points You Should Note In
2019 Jamb Chemistry_*
_I won’t do much introduction in this
article. The title explains it all. I am
in a very good mood today.
Therefore, I am going to share very
important chemistry key points and
likely Jamb 2018 Chemistry
questions with you._
Your Journey Determines The Vehicle
You Enter. Now, take a glass of water
and let me take you through
Chemistry key points that would
enable you answer likely Jamb
questions in Jamb 2018 Chemistry.
50 Notes And Key Points In Jamb
Chemistry
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
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7. The Law of Definite Proportion is
also referred to as the law of
Constant Composition.
8. Sodium liberates H2 from Water =
False.
*Sodium liberates H2 from Steam =
True
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 unstable to heat.
14. N2O is the first Anaesthetic 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 elements of water
(Hydrogen and oxygen).
18. Benzene is an Aromatic
hydrocarbon.
19. Atomic mass is the mass of
proton and neutron in the nucleus of
an atom.
20. Atomic number is the number of
Electron an atom has.
21. Electrons revolve around the
atom while Proton and Neutron are
inside the Nucleus of the Atom.
22. Radioactivity is the spontaneous
disintegration of the nuclei of an
atom to emit energy and radiations
such as ALPHA PARTICLES, BETA
PARTICLES AND GAMMA RAYS.
23. Alpha particles have the least
penetrating power. Beta particles can
be stopped by Aluminium foil while
Gamma rays can only be stopped by
LEAD BLOCK.
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24. The ability of CARBON to form
long chains, branched chains and
ring is called catenation.
25. Elements that can combine with
carbon to give compounds are:
Hydrogen
Oxygen
Chlorine
Nitrogen
Bromine
Phosphorus
26. Aliphatic Hydrocarbons could be
Cyclic, Acyclic or Alicyclic.
27. Pure substances have definite
boiling point and boiling point.
28. Example of radioactive material
are Uranium, Thorium and Polonium.
29. The most notable scientist who
contributed to the development of
Periodic table between 1817 ti 1895
was Dmitri T. Mendeleev
30. The fourth and fifth period
contains 18 elements each.
31. Elements in the same group are
called CONGENERS.
32. Free Hydrogen (H2) is the
lightest gas known.
33. Viscosity is the resistance to flow
in liquids.
34. Water starts boiling when the
saturated vapour pressure is equal to
the atmospheric pressure.
35. Factors affecting boiling points
of organic compounds are branching,
volatility, polarity and impurity.
36. The most reactive nonmetal
known is fluorine.
37. Impurity increases boiling point
but reduces melting point.
38. Ernest Rutherford is the father of
nuclear science.
39. Radioactivity can also be called
transmutation.
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40. NUCLEAR ENERGY is produced
by Nuclear fission and Nuclear
fusion.
41. Energy from the Sun reaches the
earth via nuclear fusion.
42. The two types of radioactivity are
natural radioactivity and artificial
radioactivity.
43. Every nucleus is positive.
44. For solid which sublime,
sublimation can be used to isolate
the solid from its impurities if the
impurities themselves do not
sublime.
45. CRAO.CRAO.. Reduction takes
place in cathode and oxidation
occurs in the anode.
46. Compound that rotates plane
polarised light is said to be optically
active.
47. Cathode ray tube was the
forerunner of of today’s television
tube.
48. R.A Millikan found the charge of
an electron to be -1.60×10-19C
49. Antoine Becquerel discovered
Radioactivity while Marie Curie
suggested the name “Radioactivity”.
50. Each Hydrogen spectrum
produces six series and each series
produces lines while each line has
specific wavelength.
Brought To You By: Kenneth ojuye
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