PHYSICAL PROPERTIES OF WATER_PART 01

For more information: http://www.7activestudio.com info@7activestudio.com http://www.7activemedical.com/ info@7activemedical.com http://www.sciencetuts.com/ 7activestudio@gmail.com Contact: +91- 9700061777, 040-64501777 / 65864777 7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for K-12. We also customise the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use. WATER: A major part of all living organisms is made up of water. Human body has about 65% and some plants have as much as 95% water It is a crucial compound for the survival of all life forms. It is a solvent of great importance.The distribution of water over the earth’s surface is not uniform. PHYSICAL PROPERTIES OF WATER : It is a color less and taste less liquid. The un-usual properties of water in the condensed phase are due to the presence of extensive hydrogen bonding between water molecules. This leads to high freezing point, boiling point, heat of vaporization and heat of fusion in comparison to H2S & H2Se. Water has a higher specific heat, thermal conductivity surface tension, dipole moment and dielectric constant etc.. It is an excellent solvent for transportation of ions and molecules required for plant and animal metabolism. Due to hydrogen bonding alcohol and carbohydrates dissolved in water. Structure of water: In the gas phase water is a bent molecule with a bond angle of 104051 104degrees 5mins and O-H bond length It is a highly polar molecule. In the liquid phase water molecules are associated together by hydrogen bonds.The crystalline form of water is ice. At atmospheric pressure ice crystallises in the hexagonal form but at very low temperatures it condenses to cubic form. The density of ice is less than that of water therefore an ice cube floats on water. Structure of ice: Ice has a three dimensional hydrogen bonded structure Each oxygen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 276pm. Chemical properties of water: Amphoteric nature: It has the ability to act as an acid as well as a base i,e it behaves as an amphoteric substance. Redox reactions involving water : Water can be easily reduced to dihydrogen by highly electropositive metals. Hydrolysis reaction : Due to high dielectric constant, it has a very strong hydrating tendency. It dissolves many ionic compounds covalent and ionic compounds are hydrolysed in water.