Colligative Properties & Osmotic Pressure (Lab – Chapter 13) Introduction: In this lab‚ we are going to observe the difference in freezing point between pure water and salt water. We will also observe the permeability of an egg shell membrane and dialysis tubing‚ acting in place of a human cell‚ when placed into a hypertonic or hypotonic solution. We will observe the changes in size‚ shape‚ and characteristic. Materials and Methods: First we begin this experiment by making an ice bath in
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Water Crisis and Water Management in Pakistan 1- Introduction Water plays a vital role in a country’s economy. Water has been critical to the making of human history. The earliest agricultural communities emerged where crops could be cultivated with dependable rainfall and perennial rivers. Simple irrigation canals permitted greater crop production and longer growing seasons in dry areas. Some of the problems faced by the world population are as below. • More than a billion people lack access
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8.4 Water 8.4.1 Water is distributed on Earth as a solid‚ liquid and gas y y y Define the terms solute‚ solvent and solution Solution a homogeneous mixture of two or more substances Solute a substance that is dissolved in another substance or the component of a solution present in a lower amount. Solvent a substance which can dissolve another substance or the component of a solution present in a greater amount. Identify the importance of water as a solvent Water is essential as a reactant
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esp. for an investigation Good Intro to investigation Investigating the antibacterial properties of a mouthwash Introduction The mouthwash under test id Asda Protect. It contains:- · aqua · alcohol · glycerin · polysorbate 20 · sodium benzoate · aroma · sodium saccharin · cetylpyridinium chloride · menthol · sodium flouride (0.05%) In this investigation we aim to test the antibacterial properties of this mouthwash treating it like a disinfectant against three common bacteria which
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Surface Tension Properties of Liquids Introduction The purpose of this experiment is to measure and record the surface tension of water and other aqueous solutions using capillary rise method techniques and practicing lab safety. In this laboratory the surface tension of water depends on the concentration of the following solutes; NaCl‚ acetone‚ and sodium dodecyl sulfate (SDS). Intermolecular interactions as well as other phases (solid‚ or air) make a liquid exist. The data collected will show
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One of the World’s great environmental problems - Water The water problem is today one of the greatest problems the world faces. The UN calculates that if the present development continues the 2/3 of the world population will live with serious water scarcity or nearly without water by the year 2025. The UN calculates that one should have 100 litres of water pr day to manage. This is for everything - home consumption‚ agriculture‚ industry‚ etc. Many people today have less than 50 litres‚ and in
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Bottled water vs. tap water Water is an essential part to human life. We as humans need around eight to twelve cups per day to make up for the fact that throughout normal functions such as breathing and sweating we lose an average of ten cups per day. To make sure that we are healthy and everything runs properly‚ we must make sure we drink the right amount of water (msnbc.com‚ 2004). The one question when thinking about water is what type of water will you drink? The biggest controversy is bottled
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Tap Water should be the Water of Choice Scientists have warned for years that when bottles are stored in warm and hot temperatures‚ the plastic been showed to leach chemicals into the water. There are increasing effects of polyethylene terephthalate bottles on our environment. Even the price of bottle water is increasingly outrageous. With the economy the way it is‚ why spend the money on bottle water. The EPA conducted studies on chemicals found in bottled water. Even though the studies found
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Properties and Functions of Ingredients in Baking With simple ingredients such as flour‚ sugar‚ eggs‚ milk‚ butter‚ and flavorings a wide almost endless of products can be made. But to produce perfect quality products‚ careful attention must be paid to the ingredients in the recipe. Baking products depend on precise preparation. Baking is not an art. It is a science. It is important to follow baking formulas carefully and completely. “Different flours‚ fats‚ liquids‚ and sweeteners function differently
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identity of the unknown polymer by comparing its properties to properties of other known polymers. Most likely‚ the part is one of the five following polymers: polyethylene‚ polypropylene‚ polystyrene‚ polycarbonate‚ poly(vinyl chloride). These are all extremely common‚ and have widespread applications in industry. Each of these polymers exhibits properties which allow it to be of unique technological importance. Theoretical values for the properties utilized in determining the identity of the unknown
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