What Jamb Sets: 50 Hot key points Chemistry Likely Questions In Jamb 2018

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50 Notes And Key Points In Jamb Chemistry
Today I will be giving you some hot key points I’m chemistry, you can read more on this key points for proper understanding. In my last article i talked about 200 likely physics questions and key points and i shared physics syllabus pdf and keypoint please click on those link above its important. 

  • (1)  Francium.
  • Francium is a chemical element with symbol Fr and atomic number 87. It used to be known as eka-caesium and actinium K. It is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element
  • (2)
  • NUCLEAR ENERGY is produced by Nuclear fission and Nuclear fusion.
  • Nuclear power is the use of nuclear reactions that release nuclear energy to generate heat, which most frequently is then used in steam turbines to produce electricity in a nuclear power plant.
  • (3)
  • GEL is a SOL which contains more solid particle dispersed in liquid than usual.
  • (4)
  •  The hardest substance known to man is DIAMOND.-
  • Diamond is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice
  • (5)
  • The most reactive nonmetal known is fluoride.      
  •   Fluorine is a chemical element with symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions.  
  • (6)
  • The flame used by welders is called Oxy-acetylene flame
  •  Oxy-fuel welding and oxy-fuel cutting are processes that use fuel gases and oxygen to weld and cut metals, respectively. 
  • (7)
  • Antoine Becquerel discovered Radioactivity while Marie Curie suggested the name “Radioactivity”.
  • (8)
  • Every nucleus is positive
  • (9)
  • Elements in the same group are called CONGENERS.
  • congeners are related chemical substances “related to each other by origin, structure, or function”. Contents. 
  • (10)
  • Sodium liberates H2 from Water = False.
  • *Sodium liberates H2 from Steam = True
  •  The lowest Oxidation State of IRON is ZERO
  •  Quantum Numbers only describes ELECTRONS and not ATOMS.
  • Hydrogenation of Alkynes gives Alkanes
  •  The Law of Definite Proportion is also referred to as the law of Constant Composition.   
  • (In chemistry, the law of definite proportion, sometimes called Proust’s law or the law of definite composition, or law of constant composition states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.) 
  •  
  • The electrolyte used in DOWN CELL is Molten NaCl fused with Cacl2
  •  Na is not stored under water because it Tarnishes.
  •  Burning Kerosene gives CO2 + H2O
  •  Dissolution of Calcium in water gives CaO.
  •  All Nitrates are Soluble in water. Also, all nitrates unstable to heat.
  •  N2O is the first Anaesthetic man ever used.
  •  
  •  Consecutive members of the Alkane homologous series differ by CH2.
  •  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).
  •  Benzene is an Aromatic hydrocarbon.
  • Benzene is an important organic chemical compound with the chemical formula C₆H₆. The benzene molecule is composed of six carbon atoms joined in a ring with one hydrogen atom attached to each.
  •  Atomic mass is the mass of proton and neutron in the nucleus of an atom.
  • the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
  •  Atomic number is the number of Electron an atom has.
  • Electrons revolve around the atom while Proton and Neutron are inside the Nucleus of the Atom.
  •  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.
  •  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.
  •  The ability of CARBON to form long chains, branched chains and ring is called catenation.
  •  Elements that can combine with carbon to give compounds are:
  • Hydrogen
  • Oxygen
  • Chlorine
  • Nitrogen
  • Bromine
  • Phosphorus
  •  Aliphatic Hydrocarbons could be Cyclic, Acyclic or Alicyclic.
  •  Pure substances have definite boiling point and melting point.
  •  Example of radioactive material are Uranium, Thorium and Polonium.
  •  The most notable scientist who contributed to the development of Periodic table between 1817 ti 1895 was Dmitri T. Mendeleev
  •  The fourth and fifth period contains 18 elements each.
  •  
  •  Free Hydrogen (H2) is the lightest gas known.
  • Viscosity is the resistance to flow in liquids.
  • Water starts boiling when the saturated vapour pressure is equal to the atmospheric pressure.
  •  Factors affecting boiling points of organic compounds are branching, volatility, polarity and impurity.
  • Impurity increases boiling point but reduces melting point.
  •  Ernest Rutherford is the father of nuclear science.
  • Radioactivity can also be called transmutation.
  •  
  •  Energy from the Sun is as a result of Nuclear fusion but reaches the earth via Radiation (Correction Credit: Saheed Soneye).
  • The two types of radioactivity are natural radioactivity and artificial radioactivity.
  •  .
  •  For solid which sublime, sublimation can be used to isolate the solid from its impurities if the impurities themselves do not sublime.
  •  CRAO.. Reduction takes place in cathode and oxidation occurs in the anode.
  •  Compound that rotates plane polarised light is said to be optically active.
  •  Cathode ray tube was the forerunner of of today’s television tube.
  • R.A Millikan found the charge of an electron to be -1.60×10-19C
  •  
  •  Each Hydrogen spectrum produces six series and each series produces lines while each line has specific wavelength.
READ  JAMB Biology Questions and answers 2018/2019-2020  | Check JAMB Biology Repeated Questions :useful in 2019/2020 
Updated: January 18, 2018 — 2:54 am

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