Tag: o level chemistry revision

Hello students. This is a tricky chapter so I suggest you all pay attention. In this topic we study about the macromolecules that the organic compounds we studied about in the previous topic form.

Organic chemistry is the chemistry of the compounds of carbon. Actually, it is the study of ‘hydrocarbons’. Hydrocarbons are compounds containing hydrogen and carbon and no other element. There are many types of hydrocarbons. They are classified into several types according to their structure.

In this topic, we study about air, its pollutants, oxygen, hydrogen, water and more environmental issues and facts.

Hello students. In this topic, we learn about how Sulphuric acid is manufactured by a process called contact process. But before we begin, let’s learn a little about the oxides of sulphur: sulphur dioxide and sulphur trioxide.

Ammonia is the most important compound of nitrogen. It is produced industrially by the Haber Process. The raw materials for the process are hydrogen and nitrogen.

An exothermic reaction is one where energy (heat) is given out causing a temperature rise in the surroundings. The temperature of the reaction mixture rises. An endothermic reaction is one where energy (heat) is taken in causing a temperature drop in the surroundings.

All salts are ionic compounds. A salt is formed when a metallic ion or an ammonium ion replaces one or more hydrogen ions of an acid. We will study about this substance in detail in this topic.

Acid is a substance which produces hydrogen ions, H+, when it is dissolved in water. All acids contain hydrogen ions, but not all compounds that contain hydrogen are acids, e.g. NH3.

Dear students, this is a simple and short topic. We will learn in this lesson how and why must we extract metals from their natural ores.