Chemistry Final Exams Question Bank and answers
Chemistry Revision: Set 1 1. Define Oxidation Number and Reduction Oxidation Number: It is the formal charge that an atom appears to have in a chemical species when all shared electrons are counted as belonging to the more electronegative atom. It is a theoretical tool used to track electron flow. Reduction: In terms of electron transfer, reduction is the gain of electrons by an atom or ion. In terms of oxidation number, it is the decrease in the oxidation state of an element. Reaction: Cu 2+ + 2e - → Cu Example: Copper is reduced as its oxidation number changes from +2 to 0. 2. State and Explain Mendeleev’s Periodic Law Statement: The physical and chemical properties of elements are a periodic function of their atomic masses . Arrangement: Mendeleev arranged the then-known 63 elements in increasing order of at...
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