Chemistry C1 AQA official thread

Hi guys this is a place to discuss the upcoming C1 exam good luck to all of you for Tuesday, get revising!


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thanks for starting this thread does anyone have any predictions?

Pros and cons for limestone quarrying- possible 6 marker
Evidence for Wegener's theory of Continental drift- last year they didn't ask too much for his evidence
Miller urey+ the evolution of the atmosphere- possible 6 marker
Hygrogenation, Emulsions, Emulsifiers
Distillation of air

What would be the points to make in a 6 marker on:
-Amino acids/Creation of Life
-Fractional Distillation of crude oil/air
-Early atmosphere change to todays atmosphere

For fractional distillation: Some / most of the hydrocarbons (or petrol) evaporate / form vapours or gases When some of / a fraction of the hydrocarbons (or petrol) cool to their boiling point theycondense Hydrocarbons (or petrol) that have (relatively) low boiling points and are collected nearthe top of the fractionating column or hydrocarbons with (relatively) high boiling pointsare collected near the bottom of the fractionating column The process is fractional distillation Heat the crude oil / mixture of hydrocarbons or crude oil / mixture is heated to about350°C Some of the hydrocarbons remain as liquids Liquids flow to the bottom of the fractionating column Vapours / gases rise up the fractionating column Vapours / gases cool as they rise up the fractionating column The condensed fraction (or petrol) separates from the vapours / gases and flows outthrough a pipe Some of the hydrocarbons remain as vapours / gases Some vapours / gases rise out of the top of the fractionating column There is a temperature gradient in the fractionating column or the fractionating column iscool at the top and hot at the bottom