of dissolved solids by the solution through a semi permeable membrane under an external pressure. The external pressure usually provided with the help of a pump is required to overcome the osmotic pressure or the atmospheric pressure. Due to this molecules with lower molecular
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Phytochemical and Antimicrobial study of Laptedenia pyrotechnica Forssk. Decne from Cholistan desert‚Pakistan. Nadeem Ahmed1‚S.S.Tahir1‚ M.Farman2‚ Asghari Bano1 1 : Department of Plant Sciences‚ Quaid-i-Azam University‚ Islamabad. Pakistan Council for scientific and industrial research‚ H-9‚ Islamabad. 2: Department of Chemistry‚ Quaid-i-Azam University‚ Islamabad. ABSTARCT The present study reveals the chemical composition and antimicrobial activity of extracts of Laptedenia pyrotechnica
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The polarity of water Polarity means that the molecule has both a positively and negatively charged end. More important‚ the polarity of water is responsible for effectively dissolving other polar molecules‚ such as sugars and ionic compounds such as salt. Ionic compounds dissolve in water to form ions. This is important to remember because for most biological reactions to occur‚ the reactants must be dissolved in water. Because water is able to dissolve so many common substances‚ it is known as
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MOLE UNIT REVIEW WORKSHEET 1. Convert 500.0 g NaCl to formula units. 5.15 x 1024 f.u. Convert 9.8 x 1024 molecules of C2H6 to grams. 4.9 x 102 g The mass of an unknown gas is 11.59 g. The mass of an equal volume of He is 1.45 g. Calculate the molar mass of the unknown gas. 32.0 g/mol Calculate the percentage composition of sulphur in Al2(SO4)3. 28.11% Calculate the molar mass of Co2(SO4)3•6H2O 514.16 g/mol The empirical formula for a compound is C2H5O and its molecular mass
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pear pieces of a given size. Define osmosis: Osmosis is a net movement of water/ solution molecules from a region of high concentrated area to a region of lower concentrated area through a semi-permeable membrane which lets smaller molecules such as water through but does not allot bigger molecules like glucose to pass through. The molecules will continue to diffuse until the area in which the molecules are found reaches a state of equilibrium (evenly distributed). Hypothesis: In this investigation
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practice modeling molecules and exploring the capabilities of the ChemOffice programs. The minimum energy was found for each of the three molecules tested and the strain energy at different dihedral angles was plotted. The first molecule‚ butane‚ was easily completed but amphetamine and U4EA caused some difficulty. The results of the last two were not very conclusive. INTRODUCTION The purpose of this lab was to explore the capabilities of ChemOffice in the realm of modeling molecules. The strain
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earliest determinations of the actual dimensions of the molecules‚ whilst physical phenomena observable in liquids have not‚ up to the present‚ served for the calculation of molecular dimensions. The explanation of this doubtless lies in the difficulties‚ hitherto unsurpassable‚ which discourage the development of a molecular kinetic theory of liquids that will extend t b details. It will be shown now in this paper that the size of the molecules of the solute in an undissociated dilute solution
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the functional group‚ and the molecular/scientific formula (ie. Methyl group‚ - CH3) 5. Be able to identify all the organic and inorganic molecules that you built in lab. Be ready to identify the models‚ name the molecule‚ and the molecular/scientific formula (ie. ethyl alcohol‚ CH3CH2OH). You should know the difference between organic and inorganic molecules. 6. Be familiar with the biochemical tests performed in lab-including the Millon test‚ Biuret test‚ Benedict’s test‚ Iodine test‚ Grease spot
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Diffusion is the movement of molecules from areas of high concentration to areas of low concentration. With diffusion no energy is required and it is caused by kinetic energy. The rate of diffusion can be affected by many things including temperature‚ molecular weight‚ and movement. To test the rate of diffusion a drop of dark food coloring was added to a glass of tap water and it was timed to see how long it took for the drop to reach the bottom of the glass. This procedure was repeated three
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Intermolecular forces exist between independent particles‚ such as atoms‚ ions‚ or molecules. They can be forces of either attraction or repulsion. The amount of charge‚ how it is distributed‚ and the length of time that a charge distribution exists can affect the strength of intermolecular forces. And despite having variable force strengths‚ all intermolecular forces are considered weak compared to chemical bonds‚ or intramolecular forces. Chemical bonds are not only stronger; they are also more
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