basicchemistrynotes

UNCERTAINTY IN MEASUREMENT CHEMISTRY What is meant by uncertainty in measurement chemistry ?  Let'us the study in the field of chemistry, one has to deal with experimental data as well as theoretical calculations. There are meaningful ways to handle the numbers conveniently and present the data realistically with certainty to the extent possible. how do you find the uncertainty of a measurement.  These ideas  are discussed below in details. 1) Scientific Notation As chemistry is the study of atoms and molecules which have extremely low masses and are present in extremely large numbers, a chemist has to deal with numbers as large as 602, 200,000,000,000,000,000,000 for the molecules of 2 g of hydrogen gas or as small as 0.00000000000000000000000166 gm mass of a H atom. Similarly other constants such as Planck’s constant, speed of light,charges on particles etc., involve numbers of the above magnitude.It may look funny for a moment to write or count numbers involving s

PROPERTIES OF MATTER & THEIR MEASUREMENT   Properties of matter & their measurement are divided in Physical and chemical properties . Every substance has unique or characteristic  properties. These properties can be classified  into two categories — physical properties ,  such as colour, odour, melting point, boiling point, density, etc., and chemical properties , like composition, combustibility, ractivity with acids and bases, etc.  Physical properties can be measured or observed without changing the identity or the composition of the substance. The measurement or observation of chemical properties requires a chemical change to occur. Measurement of physical properties does not require occurance of a chemical change. The examples of chemical  properties are characteristic reactions of different  substances; these include acidity or basicity,  combustibility, etc. 1)   Measurement of physical properties Quantitative measurement of properties is required for s

 CHEMISTRY 1.1 IMPORTANCE OF  BASIC CHEMISTRY Chemistry plays a central role in science and is often intertwined with other branches of science .   Principles of chemistry are applicable in diverse areas, such as weather patterns, functioning of brain and operation of a computer,gs, soa   production in chemical industries, manufacturing fertilizers, alkalies, acids, salts, dyes, polymers, dru ps, detergents, metals, alloys, etc., including new material.  Chemistry contributes in a big way to the national economy. It also plays an important role in meeting human needs for food, healthcare products and other material aimed at improving the quality of life. This is exemplified by the large-scale production of a variety of fertilizers, improved variety of pesticides and insecticides. Basic chemistry  provides methods for the isolation of lifesaving drugs from natural sources and makes possible synthesis of such drugs. Some of these drugs are cis platin and taxol, which are eff