01:160:161 Lecture Notes - Lecture 7: Lead(Ii) Nitrate, Grape, Nitric Oxide
12 Dec 2018
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Document Summary
Atoms rearrange to form new substances with different compositions and properties. The form of the substance changes but the composition and identity does not. Ex. ) phase changes like melting, freezing, boiling, etc. Both physical and chemical changes can be represented by chemical equations. A shorthand way of representing a chemical reaction. States of reactants/products (s), (l), (g) and (aq) aqueous. Necessary skill writing chemical equations from words. Copper solid reacts with aqueous nitric acid (hno3) to form aqueous copper (ii) nitrate, nitrogen monoxide gas and water . Atoms are not created or destroyed during chemical reactions. Number and types of atoms on both sides of the arrow must be the same. Balance atoms that occur as free elements last. When present on both sides of the reactions, balance a polyatomic ion as single unit. The coefficients can be thought of on two levels: atomic vs macroscopic. Balanced equation can be used as conversion factors.
