, 4
6 Which equation does not represent a disproportionation reaction?
A Cl 2 + H2O HCl O + HCl
B Cl 2 + 2NaOH NaCl O + NaCl + H2O
C 4KCl O3 KCl + 3KCl O4
D 4HCl + MnO2 MnCl 2 + Cl 2 + 2H2O
Your answer [1]
7 The equation for the reaction of sulfuric acid with potassium hydroxide is shown below.
H2SO4(aq) + 2KOH(aq) K2SO4(aq) + 2H2O(l)
25 cm3 of 1.00 mol dm–3 H2SO4 is reacted with excess KOH.
The energy given out is 2.8 kJ.
What is the enthalpy change of neutralisation, in kJ mol–1?
A –56
B –70
C –112
D –224
Your answer [1]
8 Which row in the table explains how a catalyst affects the activation energy (Ea) and the
proportion of molecules with energy > Ea?
How the activation Proportion of molecules
energy changes with energy > Ea
A decreases decreases
B decreases increases
C increases decreases
D increases increases
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