Half Equations

Question 1

A student oxidised a solution of hydrochloric acid with a few drops of sodium chlorate(l) solution. The reaction mixture effervesced and turned pale green. The gas formed bleached universal indicator paper.
(a) Write a half-equation for the oxidation of chloride ions.

Answer 1

2Cl- —> Cl2 + 2e-

Question 2

A student oxidised a solution of hydrochloric acid with a few drops of sodium chlorate(l) solution. The reaction mixture effervesced and turned pale green. The gas formed bleached universal indicator paper.
(c) Write an overall equation for the redox reaction of chlorate(I) ions with hydrochloric acid.

Answer 2

ClO- + Cl- + 2H+ —> Cl2 + H2O

Question 3

Formula of chlorate(I) ions

Answer 3

ClO-

Question 4

Square planar bond angle

Answer 4

90

Question 5

In covalent compounds, which element is given the negative oxidation number?

Answer 5

Most electronegative element

Question 6

Bond enthalpy

Answer 6

Energy needed to break one mole of a covalent bond