First Model
(1) The relation between chemistry and thermodynamics is a big story. What do you know about it?
(2) Discuss first order reactions and second order reactions.
(3) Write on parallel reactions and series reactions.
(4) C and D are two partly miscible liquids. E is a substance, which dissolves without chemical reaction in both C and D.
(a) By means of diagrams show the possible effect of temperature changes on an equilibrium mixture of C and D.
(b) Describe what you would expect to occur when varying amounts of E are shaken with a mixture of C and D.
Apply the Phase Rule to the resulting mixtures of C, D and E.
Second Model
(1) Why are chemists interested in studying Thermochemistry?
(2) Discuss first order reactions and third order reactions.
(3) Illustrate the relations between temperature, reaction rate and activation energy.
(4) Derive the Phase Rule and explain the terms involved. Sketch a phase diagram for thallium and mercury using the following facts. Label each area, line and point. [M.P. of Thallium = 303°C, M.P. of mercury = – 39°C, M.P. of Tl2Hg5 = 15°C, Eutectic for Tl/Tl2Hg5 = 0.4°C, at 41 % Tl by weight. Thallium lowers the M.P. of Mercury to a minimum of – 60°C at 8 % Tl]. (Hg = 200.6, Tl = 204.4).
Third Model
(1) What thermochemical processes are observed every day?
(2) Discuss first order reactions and zero order reactions.
(3) Explain two methods to determine the reaction order.
(4) Draw and discuss the phase diagrams (temperature – composition) for the following condensed systems, labeling each region to show phases in equilibrium within them: (a) Magnesium (M.P. 651C) and lead (327C) form PbMg2, which melts at 530C; (b) Magnesium and Nickel (1452C) form a compound MgNi2 that melts at 1145C and a compound Mg2Ni that decomposes at 770C into a liquid containing 50% (by weight) of Ni and the other compound. The eutectic are at 23% Ni and 510C and at 89% Ni and 1080C.