CHEM 111 Lecture 9: CHEM111 Class 09
21 Dec 2015
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Chem111 lecture 9 reactions and equilibrium i. 2mg + o2 2mgo: the magnesium produces a fiery white light. Ca (s) + 2h2o (l) ca(oh)2 + h2: this reaction produces h2 gas and releases a lot of heat. Kcl + agno3 kno3 + agcl: a white precipitate forms, agcl. Ki (aq) + pb(no3)2 (aq) pbi2 (s) + kno3 (aq: a yellow precipitate forms, pbi2. Hcl + naco3 h2o + co2 + nacl. Anything made of carbonate will dissolve to water and carbon dioxide gas. If the product is favored, the products escape: e. g. the combustion of gasoline (octane) If the reactants are favored, the products are confined: e. g. acetic acid in water. Not all reactions go to completion in the sense that all of the reagents are converted to products. If the products don"t escape, then the rate of the back reaction eventually reaches that of the forward reaction, and no overall change in concentrations are observed.
