Notes and Study material for Exams
Properties of polythylene Polyethylene is a thermoplastic polymer with variable crystalline structure and an extremely large range of applications depending on the particular type. It is one of the most widely produced plastics in the world (tens of millions of tons are produced worldwide each year). The commercial process (the Ziegler-Natta catalysts) that made PE … Read more
Food preservatives Food preservatives constitute a group of compounds of widely different molecular structures; they are organic and inorganic substances with different functional groups and tendencies to form ions. There are no procedures that are generally applicable to the analysis of preservatives as a class of food additive; the procedures are specific to … Read more
The Yokkaichi Asthma Epidemic: A Legacy of Industrial Pollution and Public Health The Yokkaichi asthma epidemic, a tragic event that unfolded in the 1960s in the industrial city of Yokkaichi, Japan, serves as a stark reminder of the devastating consequences of unchecked industrial pollution on human health. This episode, which saw thousands of residents suffer … Read more
The Rock Cycle: A Continuous Journey of Transformation The Earth’s surface is a dynamic and ever-changing landscape, sculpted by the relentless forces of nature. At the heart of this transformation lies the rock cycle, a continuous process that shapes and reshapes the rocks we see around us. This intricate cycle, driven by the interplay of … Read more
They are aggregates or physical mixture of one or more Minerals. Minerals on the other hand are made up of two or more Elements in a definite ratio. They have a definite chemical composition. Crust is made up of more than 2000 minerals, but out of these, 6 are the most abundant and … Read more
Acid An acid is a substance which forms H+ ions as the only positive ion in aqueous solution. Examples:- Hydrochloric acid dissolved in water forms H+ and Cl– ions HCl —> H+ + Cl– Sulphuric acid dissolved in water forms H+ and SO42- ions H2SO4 —>2H+ + SO42- Nitric acid forms H+ and NO3– ions when dissolved in water HNO3 —> H+ + NO3– … Read more
Catalyst Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed. ENZYMES are naturally occurring catalysts responsible for many essential biochemical reactions. Most solid catalysts are metals or the oxides, sulfides, and halides of metallic Elements and of the semimetallic elements boron, aluminum, and silicon. Gaseous and liquid catalysts … Read more
Various chemical and biological weapons chemical weapons A chemical weapon is any toxic chemical that can cause death, injury, incapacitation, and sensory irritation, deployed via a delivery system, such as an artillery shell, rocket, or ballistic missile. Chemical weapons are considered weapons of mass destruction and their use in armed conflict is a … Read more
Introduction to Disaster Management: A Comprehensive Guide Introduction Disasters, both natural and man-made, are an unfortunate reality of human existence. From earthquakes and hurricanes to technological failures and pandemics, these events can cause widespread devastation, loss of life, and economic disruption. Effective disaster management is crucial for mitigating these risks, protecting lives, and ensuring a … Read more