Containing species with two or more parts heme and a

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containing species with two or more parts (heme and a protein) myoglobin- heme complex and a protein in a sturcure similar to that of cytochromes hemoglobin- transport of O2 in the blood (4 myloglobin units)
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03:14 Chapter 21 Organic and Biocheical Molecules 21.1 alkanes: saturated hydrocarbons hydrocarbons- compounds composed of carbon and hydrogen saturated- carbon-carbon single bonds are saturated because they are bonded to 4  atoms, the maximum number  unsaturated- carbon-carbon multiple bonds because carbon atoms involved in a multiple  bond can react with additional atoms alkanes- simplest member of saturated carbons methane CH4 tetrahedral sp3 ethane C2H6 four atoms sp3 propane C3H8 butane C4H10 sp3 normal, straight chain, unbranched hydrocarbons meth, eth, prop, but, pent, hex, hept, oct, non, dec structural isomerism 2 molecules have same atoms but different bonds naming alkanes adding suffix –ane to greek root for number of carbon atoms; for a branched  hydrocarbon, the longest continuous chain of carbon atoms determines the root name  for the hydrocarbon
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03:14 when alkanes appear as substituents, theya re named by dropping the –ane and adding  the –yl. Ex: CH3 is obtained by removing hydrogen from methane and is called methyl Positions of substituent groups are specified by numbering the longest chain of carbon  atoms sequentially, starting at closest end to the branching Location and name of each substituent are followed by the root alkane name Reactions of alkanes Unreactive Combustion reactions High temp Subsititution reacions Halogen atoms replace H Dehydrogenation reactions H removed and product is unsaturated hydrocarbons Cyclic alkanes 21.2 Alkenes and Alkynes alkenes- hydrocarbons that contain at east one carbon-carbon double bond  CnH2n Ethylene Root hydrocarbon name ends in –ene rather than –anee thus the systematic name for  C2H4 is ethane and C3H6 is propene In alkenes containng 3 or more carbon atoms the location of the double bond is  indicated by the lowest number carbon atom in the bond Cis and trans Alkynes- unsaturated hydrocarbons containing at least one triple carbon-carbon bond
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03:14 C2H2 acetylene Reactions of alkenes and alkynes Addition reactions- unsaturated in which pi bnds are broken and new sigma bonds are  formed to atos being added Hydrogenation reactions- addition of hydrogen atoms Halogenation- addition of halogens Polymerization- many small molecules are joined together to forma  large molecule 21.3 aromatic hydrocarbons special class of cyclic unsaturated hydrocarbons benzene C6H6 has a planar ring
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