tutors for ap chemistry in northern va

Daniel Rutherford, a Scottish Physician, discovered nitrogen in 1772. But it was Lavoisier, who proved that nitrogen is an element and that it was not a supporter of combustion and respiration. He called it 'azote' meaning 'no life'. The name 'Nitrogen' was given to it by Jean Antoine Chaptal..

Summary - Nitrogen is the first member of group VA. Nitrogen has 5 electrons in its valence shell. It has a valency of 3 with respect to hydrogen and a valency upto 5 with respect to oxygen. It is a non-metal and its oxides are acidic in nature. Nitrogen is an important component of prote..

The oxides of VA group members are acidic in nature. The acidic nature of the oxides decreases as we move down the grou..

Extraction of Iron - Iron is the most abundant metal which occurs in the earth's crust. There are two forms of iron - cast iron and wrought iron - cast iron is the least pure form of iron whereas wrought iron is the purest form of iron. There are many ores of iron. Among all the ores hematite and m..

Members of group VA form hydrides, halides and oxy-acids. For example: Hydrides..

Periodic Table and Valency of Elements - a) Group IA, IIA and IIIA consists of metals of normal elements. They have 1, 2, or 3 valence electrons which they can easily donate to acquire the configuration of nearest noble gas. They become positively charged i.e., cation..

The members of group VA generally show trivalent character but nitrogen shows more than one valency ranging from +1 to +5. Example: Oxide of Nitrogen N 2 O NO N 2 O 3 NO 2 N 2 O 5 Name Nitrous Oxide Nitric Oxide Nitrogen Trioxide Nitrogen Dioxide Nitrog..

As Coulomb (C) Electric resistance Potential difference/current VA -1 Ohm () Electrical conductance Reciprocal of resistance AV -1 Siemen (S) Frequency Cycles/sec S -4 Hertz (Hz) ..