Analyst Questions

A chemical reaction in which involves the absorption of heat from the environment is called a Endothermic reaction. 

Examples : Dissolving ammonium chloride in water, photosynthesis, melting ice cubes, mixing of potassium chloride with water,...

In the contrast, chemical reactions involving release of heat are known as exothermic reactions.

Examples : Combustion, coal is burnt, mix of CaO with water,...

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Examples of compounds with covalent bonds ::

HCl, CO2, O2,... 

Agronomy is a branch of agriculture that deals with the study of crops and the soils in which they are produced.

PM inaugurates Sikkim's first airport, the Pakyong airport in Sikkim is located around 60 km from the India-China border in the village Pakyong near Gangtok the Sikkim's capital city.

Photosynthesis is the process that converts solar energy into chemical energy. During the stage of light-dependent reactions involving photosystems I and II in photosynthesis, O2 produced.