CHEM 107 Lecture Notes - Lecture 3: Ethylene, Electric Charge, Conservation Law
19 May 2016
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The transformation of one or more chemical species into new substances. Planning a synthesis is a chemical design problem. C (diamond) + o2 (g) co2 (g) (not actually true) Types of reactions (these are unbalanced eqs. here) Addition or combination : c2h4 + h2 c2h6. Decomposition : nh4no3 n2 + o2 + h2o. Substitution or displacement : mg + hcl mgcl2 + h2. Combustion (burning in o2: c3h8 + o2 co2 + h2o (also oxidation reduction reactions and acid/base reactions) These properties are conserved, and can be accounted for. : number of atoms in each element, mass, electric charge charge on both sides has to be the same (not necessarily 0 though, energy can be released. How many : molecules react with molecules, moles react with moles, not how many grams react with grams. Find smallest whole number coefficients that satisfy conservation rules. For many reactions, do this by trial and error.
