Online Lesson

Ammonia
Ammonia is a compound of nitrogen and hydrogen with the formula NH3. Both nitrogen and hydrogen are harmless gases that we breathe in everyday but ammonia is both caustic and hazardous. It is also a colourless gas with a pungent odour. It is produced by the decaying process of plants and animals, it is also found in small quantities in rainwater. It is lighter than air, its density being 0.589 times that of air. It is easily liquefied due to the strong hydrogen bonding between molecules; the liquid boils at −33.3 °C, and solidifies at −77.7 °C to white crystals. Ammonia does not burn readily or sustain combustion.

The type of chemical bonding involved is covalent bonds as nitrogen and hydrogen are non-metals, so the there are 3 hydrogen atoms to share their only electron with 1 nitrogen atom to become stable. Ammonia is manufactured by the reaction of hydrogen with nitrogen in the presence of an iron catalyst, which is known as the Haber-Bosch process.

Nitrogen is a chemical element that has the symbol N, atomic number of 7 and atomic mass 14.It is a colourless, odourless and tasteless gas that takes up 78% of the volume of the Earth’s atmosphere and 75% by weight in Earth’s atmosphere. Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H, with an average atomic weight of 1. It is the lightest and the most abundant element in the universe.
Dot and cross diagram (See above)

Done by: Dong Dexin(11) 2A2


Reference:
http://en.labs.wikimedia.org/wiki/A-level_Chemistry/OCR_(Salters)/Molecular_geometry
http://en.wikipedia.org/wiki/Ammonia
http://en.wikipedia.org/wiki/Nitrogen
http://en.wikipedia.org/wiki/Hydrogen