Category: Class 12 Chemistry

Amines are the derivatives of Ammonia, obtained by replacement of one, two or all the three hydrogen atoms by alkyl or aryl groups.

Biomolecules may be defined as complex lifeless chemical substance which form the basis of life, i.e., they not only build up living creatures but are also responsible for their growth , maintenance and ability to reproduce. Living system is composed of non-living atoms and molecules. 

Elements are the basic units of all types of matter in the universe. Elements are found to occur in nature either in free state or in the combined state i.e in the form of compounds This is mainly due to the reason that different elements have different chemical reactivities.

Surface Chemistry is the branch of chemistry which deals with phenomenon that occur at surfaces or interfaces i.e at the boundary separating two bulk phases .

Chemical Kinetics is the branch of chemistry which deals with speed or rate of chemical reaction . It also explains factors affecting rate of chemical reaction . It also describe the condition by which the reaction rates can be varied.

Electrochemistry deals with the relation between electrical energy and chemical energy and with method of their inter-conversion.  It is the study of  production of electricity from energy released during spontaneous chemical reaction and the use of that electricity to bring out non- spontaneous chemical transformation.

Solution is defined as homogenous mixture of two or more chemically non-reacting substance whose composition can be varied within in certain limits. Note: Solution have two components : solute and solvent 

Matter is anything that occupies space and has mass. Glass is an amorphous solid of silica . In glass, SiO4 tetrahedral are randomly arranged which on heating softens and melts over a range of temperature. Whereas, Quartz is a crystalline form of silica in which SiO4 tetrahedral are joined regularly . If Quartz is melted and