Oxidation-Reduction Reactions Past Paper Question (2012)
Experiment 3 involved reactions between a colorless unknown
Solution X and three aqueous solutions, iron(II) nitrate, acidified
potassium manganate(VII) and potassium iodide. Two of the three
observations made are recorded in Table 2.
TARIF 2. REACTIONS OF SOLUTION Y
Reactions of Solution X
Aqueous Iron(II) Nitrate
Acidified Potassium
Manganate(VII)
Aqueous Potassium Iodide
Observation 3
The solution changes from pale
green to pale yellow
The solution changes from
purple to colourless.
Use the data in Table 2 to answer the following questions.
Write a balanced half-equation to represent the change which
takes place when Solution X reacts with aqueous iron(II) nitrate.
(2 marks)
Explain whether Solution X is behaving as a reducing agent, an

Lem 2 the data below are for the system ethyl propyl ether (1)-chloroform (2) at 0.5 bar. use the data to answer the following questions (all questions refer to p d 0: 5 bar). a) what are the boiling points of the pure components at 0.5 bar? b) a mixture with the overall composition z1 d 0: 1 is brought to 47.6ä±c, 0.5 bar. what is the phase? c) 100 mole of a mixture with z1 d 0: 1 (state a) is mixed with 22 mole of pure ethyl propyl ether vapor (state b). the mixing takes place at 47.6 ä±c, 0.5. bar. what is the phase of the resulting mixture (state c)? if the state is a v/l mixture report the number of moles and mole fractions in each phase. d) plot the txy graph and show states a, b and c. the graph must be done by computer and should be properly annotated. ethyl propyl ether (1) - chloroform (2) at 0.5 bar t ( ä±c) x1 y1 t ( ä±c) x1 y1 42.9 0.000 0.000 49.0 0.470 0.455 43.0 0.020 0.010 49.1 0.520 0.520 43.9 0.065 0.029 48.9 0.567 0.592 45.4 0.156 0.089 48.3 0.652 0.720 46.4 0.215 0.142 47.6 0.745 0.815 47.6 0.296 0.223 46.7 0.822 0.872 48.3 0.362 0.302 45.7 0.907 0.937 48.7 0.410 0.375 44.6 1.000

Which type of fossil does this image depict?

How can one make a supersaturated solution? (apex)