AQA AS Chemistry Student Unit Guide : Unit 1 Foundation by Margaret Cross

By Margaret Cross

Scholar Unit publications are ideal for revision. every one consultant is written by way of an examiner and explains the unit requisites, summarises the proper unit content material and features a sequence of specimen questions and solutions.

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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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