(30)--8.3医用化学课件医用化学.pdf

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1、Reactions of Alkanes Alkanes,as a class,are characterized by a general inertness to many chemical reagents.C-C and C-H bonds are quite strong,they do not break unless alkanes are heated to very high temperatures.Oxidation and Reduction Reactions Oxidation（氧化反应）（氧化反应）results in an increase in the num

2、ber of C Z bonds;or Oxidation results in a decrease in the number of C H bonds.Reduction（还原反应）（还原反应）results in a decrease in the number of C Z bonds;or Reduction results in an increase in the number of C H bonds.Z=an element more electronegative than C (usually O,N,or X).Alkanes undergo combustionth

3、at is,they burn in the presence of oxygen to form carbon dioxide and water.General equation:CnH2n+2+(3n+1)/2 O2 nCO2+(n+1)H2O+heat The changing concentration of CO2 in the atmosphere since 1958 The increasing level of atmospheric CO2 is clearly evident on the graph Data recorded at Mauna Loa,Hawaii It is dangerous to drive an automobile with all the windows closed,or to warm up the car in a closed garage.Classify each transformation as an oxidation,reduction,or neither.Oxidation Neither