It is necessary also for cleanliness of homes and hospitals. Sources of drinking water: The chief sources of potable water are the surface water and ground water. The ground water is drawn by deep tube-wells and water pumps.
Water is supplied to the consumers through roadside taps and house connections. In rural areas, the supply of drinking water is hopelessly inadequate. Water is the most essential component of life and is vital for sustenance. The importance of water in our diet is apparent as it helps the body to perform specific metabolic tasks and regulates our body temperature, moreover water is unique as it's density is similar to that of cell protoplasm.
There is no doubt that water is everywhere and it is very important to our Earth and the life inhabiting it. Water contains no calories and is a significant factor in losing weight. It is the key component in determining the quality of our lives and is a universal solvent.
We should teach children to turn off faucets tightly after use, adjust sprinklers to water your lawn. Plant in the fall when conditions are cooler and collect water used for rinsing fruits and vegetables to water house plants, wash your pets outdoors in an area of your lawn that needs water and repair leaking pipes, harvest rain water.
People use up our planets fresh water faster than it can naturally be replenished so, save water for the Earth, family and community. Many of the unique properties in the take for granted include the three physical phases, transparency, universal solvents, density behavior and temperature, high specific heat, high heat of vaporization, viscosity, surface tension and low compressibility.
To understand why these properties exist in water and why they are essential to life on earth it is important to look at the shape and bonding patterns of the molecule because the uniqueness of water is a direct result of its shape and bonding patterns. The shape of the water molecule In the water molecule the oxygen atom is the central atom. It has four pairs of valence electrons surrounding it. Two of these pairs are shared which form the shared pairs form covalent bonds with the hydrogen atoms.
The remaining two pairs are unshared and have a greater repulsive effect than the shared pairs. The combined repulsive effect of the two unshared electron pairs produces an H-O-H bond angle that is smaller than the H-C-H bond angle Actual measurement of the bond angle in water is If the two hydrogen nuclei were as far apart as possible the angle would be The unique bond angle in water is only Chemical bonding To understand the unusual properties of water as well as what causes them we need to have a basic understanding of the chemical bonding and the structure of the water molecule.
The shape of the water molecule is determined in part by the chemical bonding that occurs. For a brief review of chemical bonding see appendix B. The water molecule consists of the elements hydrogen and oxygen.
The chemical bonds in the water molecule are covalent bonds since the hydrogen atoms combine with the oxygen atoms in shared electron pairs. The oxygen atoms exerts a relatively strong pull on the shared electron pairs which causes the hydrogen atom to become electropositive regions and the oxygen atoms to become an electronegative region. The water molecule is considered a polar molecule because the positive and negative regions are not evenly distributed around a center point.
The water molecule due to its polar nature is electrostatically attracted to other water molecules as well as other ions in solution. The attraction of the electropositive hydrogen atom to the electronegative oxygen atom of an adjacent water molecule is the bridging phenomenon known as hydrogen bonding and is only about 10 percent the strengths of a covalent bond.
This special bond is responsible for most of the unusual properties of water: Let us look more closely at the bonding patterns of water. Polar Covalent Bond When oxygen and hydrogen atoms are brought together the difference in their electronegativities is not sufficient to yield ions.
Instead they must share a pair of electrons between them forming a covalent bond. This results in a concentration of negative charges nearer the oxygen atom and thus further from the positively charges protons that make the nuclei of the hydrogen atoms. The bond formed is intermediate between a fully ionic bond and a purely covalent bond.
There is a separation of charges but not complete as in the formation of ions. The partial charge that is produced is symbolized by d. In Water, one side of the molecule, where the hydrogen atoms are, will be partially positively charged. The other side with the unshared pairs of electrons will be negatively charged.
As a whole the molecule is polar. So it can be said that the water molecule has a polar covalent bond. The polarity of the water molecule makes mutual attraction between water molecules possible. This means that each water molecule attracts four other water molecules to it. The hydrogen atom is attracted to the oxygen atom of the adjacent water molecule.
Each oxygen atom can associate with two hydrogen atoms of other nearby water molecule through its unshared pair of electrons. The force of attraction between these polar molecules is not as strong as a covalent or ionic bond but strong enough to be significant. It is the hydrogen bonding that occurs between water molecules that accounts for many of the remarkable and vital properties of water that make the presence of water synonymous with life itself.
Firstly, the ability of water to remain liquid over a large portion of the range of temperatures found on earth is one such vital property. Other molecules, as small as water eg CO2 , change from liquid to gas at temperatures far below that of water. It is also the Hydrogen bond which is responsible for the large amount of heat energy needed to convert water from liquid to gas.
WATER ESSAY The first thing water reminds us of is the clear liquid in our water bottles. However, water is more than a normal substance. Water is the beginning and the continual of life on earth. Because of its many unique properties, water was able to start life on our planet. Water covers about 3/4 of the earth.
Introduction Water is an essential ingredient for the existence of life as we know it. Biochemical processes occur in aqueous environments, many of which use.
Sources of drinking water: The chief sources of potable water are the surface water and ground water. The ground water is drawn by deep tube-wells and water pumps. Water is supplied to the consumers through roadside taps and house connections. Water has many roles in living organisms and life on earth is impossible without it. It makes up between 60% and 95% of the fresh mass of the organisms. In a water molecule, two hydrogen atoms are joined to an oxygen atom by covalent bonds.
Essay on Water Published by admin at am under Example Essays Introduction Water is an essential ingredient for the existence of life as we know it. Biochemical processes occur in aqueous environments, many of which use water. Water also plays a significant role in the process of photosynthesis (6 CO2 + 6H2O + kcal -> . Water is often considered to be one of the most important resources our planet has, and rightly so. Although people don’t need to be surrounded by water all the time, we shouldn’t forget that a human being can survive without food for about several weeks, but without water he would die in the matter of days.