Search: “che”

Hydrosulphuric acid (H2S). This substance is a gas having the composition expressed by the formula H2S and is commonly called hydrogen […]

Sulfur belongs to the chalcogen family. Other members of the family are oxygen, selenium, tellurium, and polonium. These elements make up Group 16 (VIA) […]

Nitrogen has 5 electrons in its valence shell. It has a valency of 3 with respect to hydrogen and a […]

Nitrogen, which makes up about 78% of our atmosphere, is a colorless, odorless, tasteless and chemically unreactive gas at room […]

There are six elements in Group VIIA, the next-to-last column of the periodic table. As expected, these elements have certain […]

Oxygen is the most abundant element on earth. It is found almost in everything in nature and also in free […]

Hydrogen comes from Greek meaning “water producer” (“hydro” =water and “gennao”=to make). First isolated and identified as an element by Cavendish […]

https://www.youtube.com/embed/eJXL0IrbtqEEnergy is conserved in chemical reactions. One way of stating the ‘law of Conservation of Energy’ is to say the […]

Since it is not possible to calculate the weight of particles individually, a collection of such particles called mole is […]

Mole concept is arguably the broadest topic in chemistry, as it cuts across every other branch of chemistry, as far […]