For Science student offering chemistry in
Here are 50 powerful and amazing key points to blast Jamb 2019 Chemistry exam
Do not neglect this
1.Fractional crystallization is used to separate different solutes(solids) from a solution based on their differences in solubility at different temperature. The salt with the least solubility crystalizes out first.
2.Fractional distillation is used to separate different solvent in a mixtured based on their difference in boiling point.
3.The Separating funnel is used to separate a mixture of two or more immiscible liquids.
4.Precipitation is used to separate insoluble solid(principle of solubility) from two miscible liquid.
5.Chromatography is a separating technique that separate a mixture of solvent based on their different rate of movement in a medium.
6.The law of conservation of mass states that matter can never be created nor destroyed
7.The law which states that all pure samples of a particular pure chemical substance contains the same the same element combined in the same proportion by mass is the law of definite proportion.
8.The law of definite proportion is also called the law of constant composition
9.Electrons, Protons, Neutrons are all sub-atomic particles
10.J.J Thompson discovered electrons using the cathode ray tubes
11.J.J Thompson discovered postively charge partices(protons) by using cathode ray tube with one of its plate perforated
12.Chadwick discovered neutrons by bombarding berylium metal with alpha particles
13.J.J Thompson proposed that an atom is a sphere containig postive and negative paricle homogenously distributed in the sphere

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