If a reaction is exothermic and there is a great disorder, it means that
the reaction is static
the reaction is in a state of equilibrium
there will be a large increase in free energy
there will be a large decrease in free energy
In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by
lowering the pressure of the reaction
increasing the surface area of the reactant
increase the rate of the reaction
lowering the energy barrier of the reaction
The graph above demonstrate the effect of
surface area on the rate of reaction
catalyst on the rate of reaction
pressure on the rate reaction
concentration on the rate of reaction
2H2(g) + O2(g) ⇋ 2H2O(g) ΔH = - ve. What happens to the equilibrium constant of the reaction above if the temperature is increased?
it is unaffected
it becomes zero
it decrease
it increases
To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of
CO
Cl-
SO
NO
