GCSE Chemistry Specification

OCR B J258

Section C6.3: What factors affect the yield of chemical reactions?

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#C6.3.1

recall that some reactions may be reversed by altering the reaction conditions including:

a) reversible reactions are shown by the symbol ⇌
b) reversible reactions (in closed systems) do not reach 100% yield

#C6.3.2

recall that dynamic equilibrium occurs when the rates of forward and reverse reactions are equal

#C6.3.3

predict the effect of changing reaction conditions (concentration, temperature and pressure) on equilibrium position and suggest appropriate conditions to produce a particular product, including:

a) catalysts increase rate but do not affect yield
b) the disadvantages of using very high temperatures or pressures