Chemistry

Hazard symbol means that direct contact on skin or inhalation of substances main cause short or long term hum our health.

Let off think of burning a candle made with wax. Wax is a mixture of various hydrocarbons. Organic compounds made of hydrogen and carbon are known as hydrocarbons. In the burning of a wax, three States of matter can be observed simultaneously. There is a a thin liner inside the wax. When we add fire … Read more

In environmental Chemistry, the chemical oxygen demand is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution.

The mathematical study of the structure of an atom is called quantum mechanics.

At normal pressure (1 atm), the temperature at which a solid matter turns into a liquid state is called melting point of the solid substance.

The modern periodic law is as follows- In the periodic table, the physical and chemical properties of the elements repeat periodically with their atomic number depending upon the electronic arrangement of the elements. 

Why is Calcium called alkaline earth metal?Calcium is called an alkaline earth metal because it is a member of Group 2A (or IIA) of the periodic table. The elements in this group are all characterized by two valence electrons in their outermost shells, which theycan easily lose to form cations with a +2 charge. This … Read more

The energy emitted when we try to transform an element in its gaseous state into one mole negative ion by injecting one mole electron into its one mole atom is called the electron affinity.