SS2 Second Term Chemistry Lesson Note – Halogens II

The content is just an excerpt from the complete note for SS2 Second Term Chemistry Lesson Note – Halogens II. Check below to download the complete DOCUMENT

WEEK 5

TOPIC: HALOGENS

CONTENT:

1. Preparation of chlorine (laboratory and industrial)
2. Properties of chlorine (physical and chemical)
3. Hydrogen chloride gas: laboratory preparation properties and uses,
4. Test for HCl gas and fountain experiment.

PERIOD 1: PREPARATION OF CHLORINE (LABORATORY AND INDUSTRIAL)

In the laboratory chlorine is prepared by the oxidation of concentrated hydrochloric acid with manganese (IV) oxide. The mixture is heated to obtain a greenish- yellow gas (chlorine).

MnO_2(s) + 4HCl _(aq)   → MnCl_2(aq) + 2H₂O + Cl₂

Chlorine is prepared industrial by the electrolysis of brine and molten metallic chlorides

PERIOD 2: PHYSICAL PROPERTIES OF CHLORINE

1. It is a greenish-yellow gas with an unpleasant choking smell.
2. It is denser than air.
3. It is slightly soluble in water.
4. It is poisonous.

The chemical properties of chlorine have been discussed under the general properties of halogens. Let’s discuss the oxidizing properties of chlorine.

1. Chlorine oxidizes hydrogen sulphide to yellow sulphur.

To gain full access to the note: DOWNLOAD FILE