CHEMISTRY SS2

Water naturally has a variety of minerals such as calcium and magnesium. Whether a water supply is considered “hard” or “soft” depends on how much of these minerals are in your water. 

By volume, the dry air in Earth's atmosphere is about 78.08 percent nitrogen, 20.95 percent oxygen, and 0.93 percent argon. A brew of trace gases accounts for the other approximately 0.04 percent, including the greenhouse gases carbon dioxide, methane, nitrous oxide and ozone

Hydrogen is the lightest of all elements making up about 1% of the earth crust and the first element in the periodic table. Its consist of one proton and one electron. The position of hydrogen in the periodic table is between group one and group seven. It’s has just one electron in it outermost shell. It’s in group seven because its need just one electron to attain the noble gas structure of helium

Liquid oxygen is used in liquid-fueled rockets as the oxidizer for fuels such as hydrogen and liquid methane.

Halogen is a family in the periodic table that play a vita role in everydays life 

The importance of Nitrogen and it compounds can't be over emphasize, so there's need for learners to have knowledge on it 

Nitrogen is a major component in drugs and other sphere of life

Sulphur has wide application in drug industries and other areas too.

H2S, SO2 and SO3: Preparation, Properties and Uses

Tetraoxosulphate (VI) acid: Industrial Preparation (Contact Process).

WEEK  5

IONIC THEORY

IONIC THEORY

To account for the phenomena of electrolysis the Ionic Theory was put forward by Arrhenius in 1880. The theory states that electrolytes are made up of ions, which are built up in certain patterns called crystal lattice. When these substances dissolve in water, the structure is destroyed and the ions are set free to move.