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Page 1

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Equilibria

Define the term dynamic equilibrium (2)

Where the forward and backward reactions are happening at the same rate therefore
concentrations of all reactants and products remain constant

State Le Chatelier's principle (1)

An equilibrium opposes change

Justify the reason for a comprise in temperature and pressure in the Haber…

Page 2

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Energetics

Define the term standard enthalpy of formation (3)

The enthalpy change when one mole of substance is formed from its constituent elements under
standard conditions, with all reactants and products in their standard states

Define the term stand enthalpy of combustion (3)

The enthalpy change when one mole of…

Page 3

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H2SO4 +6

SO2 +4

Write a half equation for the reduction of Sulphur from H2SO4 to SO2 (1)

H2SO4 + 2H+ + 2e- SO2 + 2H2O

Write a half equation for the oxidation of Bromide ions to Bromine molecules (1)

2Br - Br2 + 2e ­

Construct an overall equation…

Page 4

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State any solid products produced from the full reaction between NaI and H2SO4 and the
observation of the products (2 or 3)

NaHSO4 (white solid)

Sulphur yellow power

State why an acid may be added to a aqueous solution of a particular halide ion before
reacting with Silver Nitrate (1)…

Page 5

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Write an equation including state symbols of the reaction between Magnesium and water (2)

Mg(s) + 2H2O(l) Mg(OH)2(s) + H2(g)

State a use of Magnesium hydroxide (1)

Used for indigestion problems

Write an equation including state symbols of the reaction between Magnesium and steam (2)

Mg(s) + H2O(g) MgO(s) +…

Page 6

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State why recycling Iron is a better alternative to extraction of Iron oxide (1)

Less energy is used

State why Aluminium oxide is dissolved in molten cryolite (1)

Reduces reaction temperature

Write a half equation for the electrolysis of Aluminium oxide at the positive electrode to
produce aluminium (1)

Al3+…

Page 7

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Advantage:- Less Mg than Na is required

Disadvantage:- MgCl2 has no value/uses



Write an equation for the reduction of Tungsten (VI) by hydrogen (1)

WO3 + 3H2 W + 3H2O

Explain why using Hydrogen is a last resort (1)

Hydrogen is flammable and can cause an explosion

State why Carbon…

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