Biology Lab #1: Chemical Diffusion Purpose To discover how the size of a cell affects the diffusion of chemicals throughout the cell. Hypothesis I predict that as the cell size increases the diffusion depth and the diffusion rate will decrease. Equipment • Eye protection • 250 mL beaker • Timing device • Scoopula • Ruler • Scalpel • Sodium hydroxide solution • 3 different sized cubes of phenolphthalein agar • Paper towels Purpose
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Of A Multi-Component Mixture By Spectrophotometric Analysis Objectives: 1.Solid sample handling 2.The composition of a three-component mixture will be assayed by dissolution of the soluble components in water and measurement of their individual concentrations by visible spectrophotometry. Text Reference: Handbook of Instrumental Techniques for Analytical Chemistry‚ Frank Settle‚ editor. Prentice Hall‚ ‚ Upper Saddle River‚ NJ 1997‚ Ch 25. H.H. Willard‚ et. al. Instrumental Methods of Analysis‚ 7th
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with varying concentrations  potato cut into small discs Results. (Fig 1.0) Sucrose concentration (M) Initial mass (kg) Final mass (kg) Change in mass (%) 0.10 0.95 1.25 31.57 0.20 0.94 1.13 20.21 0.30 1.03 1.15 11.65 0.40 0.95 1.05 10.52 0.50 0.88 0.86 -2.27 0.60 0.93 0.84 -9.67 Control 0.99 1.40 42.41 Discussion. Osmosis is the passive diffusion of water molecules across a selectively permeable membrane from a down a concentration gradient.
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College of Engineering‚ University of the Philippines‚ Diliman 1100 ------------------------------------------------- January 11‚ 2012 DISCUSSION Reaction rates determine the speed at which products are formed from the reactants. Expressed as concentration divided by time‚ reaction rates measure the rate of disappearance of the reactants‚ and‚ conversely‚ the rate of formation of the products1. Not all reactions however proceed at the forward direction only. In some reactions‚ the system appears
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supplied voltage (4V)‚ amount of soil (50 gm) & water (150 mL) in soil sample’s solution. Independent Amps recorded by ammeter. Uncontrollable Impurities dissolved into water. Materials Power pack; copper electrodes; ammeter; 8 different concentrations of salt solution (NaCl) 0.1‚ 0.5‚ 1‚ 1.5‚ 2‚ 2.5‚ 3‚ 3.5 mols; beakers; filter papers; funnel; wires; retort stand; scales; 3 soil samples; distilled water. Method 1) Pour 100 mL of 0.1 mol NaCl solution onto beaker‚ place electrodes in
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dryer in time‚ to ensure which quickly exchange heat with the drying materials and put out timely‚and then to lower the concentration of the waste gas as possible in order to achieve the purpose of fast drying. At present‚ the drying dust removal generally choose bag dust removal‚ the original cyclone dust removal‚ static dust is ventilated effect is good‚ but high concentration‚ discharge dust pollution. Bag filter waste gas processing quantity size should be chosen according to the size of the model
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Because the amount of light absorbed or emitted is directly proportional to the number of atoms or molecules. Raw Data and Observations: Please see attached. Results: Red #40: absorbance vs. concentration Blue # 1: absorbance vs. concentration % Composition (Grape): % Composition = (mass of Red #40 dye in sample / total mass of sample) (100%) = (4.068 x10^-4 g / 0.1019 g) (100%) = 3.992 x10^-3 (100%) = 0.399% % Composition
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6. FIRST DERIVATIVE ZERO CROSSING METHOD 6.1. ABSTRACT: Simple‚ specific‚ accurate and precise 1st order derivative zero-crossing spectroscopic method was developed for simultaneous determination of PHENYLEPHRINE and EBASTINE from their binary mixture. In this 1st derivative zero-crossing spectroscopic method the amplitudes of the 1st order derivative of the spectra of the binary mixture containing PHE and EBS were measured at 252.2 nm (zero crossing of EBS) for determination of PHE and at 274.8
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THE EFFECT OF THE WATER CONCENTRATION GRADIENT ON THE RATE OF OSMOSIS Investigation Folio: Summative Stage 1 Biology: SEMESTER 1 2014 MARCIA SHAW - 151003X INTRODUCTION Diffusion: is when something spreads more widely from a higher concentration gradient to a lower concentration gradient. Diffusion is the process from which molecules‚ atoms or ions mingle together and move from an area of high concentration to an area of low concentration as a result to their kinetic energy. for example
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Tan 1 DNA EXTRACTION Aim : To extract the DNA from an egg yolk using various enzymes and to compare with other groups the most effective way to extract DNA. Hypothesis : To be able to observe white springy substances after mixing with enzyme and alcohol. Apparatus : -Test tube‚ spatula‚ glass rod‚ dropper‚ beaker‚ test tube rack‚ skewer. Materials : - 1 egg‚ meat tenderizer‚ salt‚ water ‚ soap‚ isopropyl alcohol 91%‚ pineapple juice. Variables : Manipulated Variable : Responding
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