IMPORTANCE OF FRESH WATER All living things on Earth need fresh water in order to survive But human beings become ill and may even die if they cannot get pure or clean and are forced to drink polluted water. Human beings can only last 3 day without fresh water. People died of thirst after the cyclone in 1999 because their supply of fresh water from irrigation channels was destroyed form tidal waves. However water is needed for many more purposes e.g. in agriculture and industries‚ but this water
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The biochemical importance of water Sam Ellick 13/11/2010 Water otherwise known as H2O is a necessity for life to exist. It has many unique features compared to other molecules of its size. For example solid ice is less dense than liquid ice‚ which ponds and lakes freeze from the top down. This is important in insulating the aquatic life in the winter. This essay however will be looking at why water is so important in biochemical terms. Its shape Water‚ as its formula H2O suggests‚ consists
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Water‚ that magical substance from which all life springs forth‚ is essential to the very existence of every life form on earth. The role of water in the living organism has not changed since life’s first creation in salt water billions of years ago. The human body is 75% water‚ while the brain alone is comprised of 85% water. The blood‚ consisting of 92% water‚ carries oxygen and essential nutrients to capillaries where they are released into a water-based fluid that surrounds the cells called
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Title: Physical and Chemical Properties Purpose: To investigate the physical and chemical properties of pure substances as distinguishing characteristics. Procedure: 1. Set up a well plate with 24 pieces and fill two with either Dilute HCl or Dilute NaOH. 2. Set up four test tubes with any single substance in each one. 3. Observe and record original color and odor of substance. 4. Light flame with matches. -Hold test tube with substance in it over flame with clamps -Observe and record
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Biological Importance of Water for Living Organisms Water is made up of two elements‚ 2 positively charged hydrogen molecules and one negatively charged oxygen molecule. Water molecules have uneven charge distribution as one end of the molecule is slightly positive and the other slightly negative‚ this is called polar. Ionic substances such as sodium chloride dissolve easily in water because the positively and negatively charged ions are separated due to the dipole nature of water. As water is dipolar
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9/23/2014 Experiment # 3 Purpose: the purpose of this experiment was to explore the distinctions between physical and chemical properties and between physical and chemical changes. Lab questions: 1. Based on my observation CaCl2 is soluble in water. 2. When 15% of HCl was added to CaCl2 as the teacher was performing the experiment I observed and realized some changes took place physically. It was physical change because the color was clear. 3. By adding 15% of HCl of CaCo3 ‚ made it change chemically
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The importance of saving water 1.0 Introduction In our life‚ water plays an important role. It is the source of life. It is a irreplaceable element with human survival and development. Our life can not without water‚ depend on research‚ human can’t without water more than 72 hours‚ fish can’t without water more than 20 minutes‚ plants can’t live without water also‚ on the earth‚ where has water‚ there has life. Life originated from water. 65% of our weight is water‚ there into‚ 75% of brains
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The Biological Importance of Water Water is perhaps the most important molecule for the survival and life of organisms. On the surface of the planet there is obviously much more area of water than land‚ which shows its significance. The fact that water makes up 60-95% of all living organisms shows the incredible biological importance of water. Water has many uses and roles‚ one of them it being used as a support unit in plants. The uptake of water by plant cells creates a pressure against the rigid
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Drink Water Speech How many of you‚ when you go to a restaurant and the waiter/waitress asks you what you want to drink ask for water? How many you would select a glass of water out a fridge filled with soda‚ fruit juices‚ or beer? My guess is probably not very many you actually choose water over the other options. I used to be the same way. I used to never drink water‚ and would always choose another beverage if I had the option. However‚ after I began to hear about the importance of water
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CHEMICAL PARAMETERS OF FRESHWATERS Objectives At the end of this section‚ students should be able to 1. Distinguish between freshwaters and seawater in terms of ionic composition. 2. Describe the variation of ionic composition in natural freshwaters and other inland waters. 3. Explain the factors that contribute to such variation. 4. Describe Gibbs’ model that explains the major factors contributing to variation in chemical composition of inland waters. 5. Explain
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