CHM 111 Lecture Notes - Lecture 4: Chemical Equation, Chemical Reaction, Covalent Bond
14 Feb 2018
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Symbolic way to represent the elementary composition of a substance. Reveals elements (chemical symbols) and their ratios (subscripts) If chemical symbols are the alphabet then chemical formulas are the words c. ***** know these prefixes for both covalent compounds and hydrocarbons***** Chemical reaction: process whereby reactants are transformed into products. Chemical equation: representation of a reaction using chemical formulas (arrow shows chemical change) Are the properties of the products different from the properties of the reactants: yes, the properties are different because there is a rearrangement of the atoms, ex. Sodium chloride (table salt: alone sodium: reacts with water and catches on fire, chlorine gas: is actually toxic, together they create something this we eat everyday. A hydrocarbon (fuel) burns in the presence of oxygen to produce carbon dioxide and water and releases energy as heat: most of the time the energy is used to do work, ex.
