AQA Jan 2011 Paper 1 Q6 (with explained solutions) |

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AQA Jan 2011 Paper 1 Q6

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do not write outside the box octane is the eighth member of the alkane homologous series a state two characteristics of a homologous series marks extra space b name a process used to separate octane from a mixture containing several different alkanes mark wmp jan chem c the structure shown below is one of several structural isomers of octane do not write outside the box h c ch ch ch give the meaning of the term structural isomerism name this isomer and state its empirical formula marks extra space d suggest why the branched chain isomer shown above has a lower boiling point than octane marks end of questions wmp jan chem

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$mark scheme general certificate of education a level chemistry unit foundation chemistry january marking guidance mark comments question a any two points allow glc allow alkanes with same molecular formula allow same chemical formula in m but can allow m not different positions in space m dependent on m ignore the absence of dash and or commas same general formula allow a named homologous series with its general formula chemically similar same chemical reactions same functional group trend in physical properties eg inc bp as mr increases molecules increase by ch mr b c fractional distillation fractionation chromatography molecules compounds substances with the same molecular formula same number and type of atoms but different structural formula different displayed formula different arrangement of atoms different structures dimethylhexane c h mark scheme general certificate of education a level chemistry unit foundation chemistry january d less surface contact less surface area less polarisable molecule so fewer weaker less van der waals vdw forces allow more spherical or fewer ponts of contact not smaller molecule not more compact molecule not shorter chain allow converse arguments must be comparative answer ie not just few vdw forces qol assume it refers to the branched isomer$

Question 1 2 3 4 5 6

Topics to revise

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Organic Chemistry > Halogenoalkanes AS >

1 Nucleophilic substitution

AQA > Organic Chemistry > Introduction to organic chemistry AS >

2 Naming organic chemicals

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Physical chemistry > Atomic structure AS >

3 Relative Atomic and Molecular Mass

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