Advances in Photochemistry by Noyes W

By Noyes W

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For example: 4 3 2 1 CH3 CH2 CH CH3 Br 2-bromobutane ● To indicate the position of a double bond, the number of the lowest numbered carbon atom involved is placed before –ene. For example, CH2=CHCH2CH3 is called but-1-ene; CH3CH=CHCH3 is but-2-ene. ● If the same functional group appears more than once, this is indicated by a prefix. Di- means two groups, tri- means three groups and tetra- means four groups. e. bromo- before chloroand tribromo- before dichloro-. CH2 CH Cl Br CH3 2-bromo-1-chloropropane Isomerism Isomerism occurs where molecules with the same molecular formula have a different arrangement of atoms.

2NaOH(aq) ؉ H2SO4(aq) → Na2SO4(aq) ؉ H2O(l) (e) Carbamide, NH2CONH2, is used as a fertiliser, in animal feeds, in paper processing and in a range of manufacturing processes. Its manufacture can be represented by the overall equation: CO2 + 2NH3 → NH2CONH2 + H2O Calculate the percentage atom economy for the production of carbamide. 00 atomic mass units. 023 ϫ 1023 is the Avogadro constant ✓. 62 You can give the definition as a sentence or express it as a formula. 023 ϫ 1023) of particles. This number is the Avogadro constant.

For example, CH2=CHCH2CH3 is called but-1-ene; CH3CH=CHCH3 is but-2-ene. ● If the same functional group appears more than once, this is indicated by a prefix. Di- means two groups, tri- means three groups and tetra- means four groups. e. bromo- before chloroand tribromo- before dichloro-. CH2 CH Cl Br CH3 2-bromo-1-chloropropane Isomerism Isomerism occurs where molecules with the same molecular formula have a different arrangement of atoms. There are two main types of isomerism: ● structural isomerism ● stereoisomerism Both types of isomerism can be further subdivided.

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