Lesson 31Help sessions•Thursdays and Fridays•11:30-12:20 pm•RCH 209•Note: I have now moved office and am in E6-4008.•Office hour: M 1:30-2:30•Other times: drop in, or e-mail first if you want to guarantee I’m in.Lesson 3Lesson 3The chemical equation•Chemical equations describe changes that occur in chemical reactions: N2O5NO2+ O2•Chemical equations must be balanced, i.e. the number of atoms on the reactant side should be equal to the number of atoms on the product side (atom conservation principle):2 N2O54 NO2+ O2N2O52 NO2+ ½ O2etc •The stoichiometric chemical equationdescribes only the net changestaking place in a reaction. It does not correspond necessarily to what takes place at a molecular level. Lesson 3Space filling model for the reaction between NO and O2Petrucci et al.
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