a) Which electrode behave as negative electrode? Why? - + 3.
a) Which electrode behave as negative electrode? Why? A because iodide ions undergoes oxidation where it lose electrons, the electrons are negatively charged causing it to be negative electrode
b) Draw direction for electron flow in the outer circuit
c) Write out the rough equation first to show reactants and the products d) Put arrows on your equation above to show oxidation reaction and reduction reaction on your answer in c) above OXIDATION REDUCTION
e) What substance is oxidized? Explain your answer in terms of electron transfer Iodide ions because it lose electron
f) What substance is reduced? Explain your answer in terms of electron transfer Dichromate ions because it accept electrons
i) State your observations during the experiment at i)Rod A ii)Rod B Dark brown solution formed Orange solution turns to green solution
j)How do you test the presence of iodine formed at rod A? OR Add 2 cm 3 tetrachloromethane to iodine solution, shake well then purple solution formed at lower layer Add a few drops of starch solution, a blue-black solution formed