from an area of low concentration to an area of high concentration. Osmosis was discovered by René Joachim Henri Dutrochet in 1826. Dutrochet’s research on osmosis and diffusion attracted a lot of attention to the public. He observed “that certain organic membranes allow the passage of water but stop the molecules dissolved in it” (Encyclopedia.com‚ 2008). He noticed that between two solutions of different concentrations in a membrane‚ water passes from an area of low concentration to an area of higher
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answered: d. The cells shrink. 3. The variable that affects osmotic pressure is You correctly answered: a. the concentration of nondiffusing solutes. 4. The net movement of water would be into the cell in a You correctly answered: b. hypotonic solution. 09/16/12 page 1 Experiment Results Predict Question: Predict Question 1: What effect do you think increasing the Na+ Cl- concentration will have? Your answer : a. increased pressure Predict Question 2: What do you think will be the pressure result
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absorbance level is 400 to 600 those are in nanometer unit‚ in this experiment the wavelength to used is 470‚ 500‚ 530‚ 560‚ 620‚ 650‚ 680 nanometer. Measures the absorption of light by spectrophotometer with a specific wavelength used to determine the concentration of the pigments or solution. Figure 1.1 shows the schematic diagram of the spectrophotometer. The instrument show the content of the light source which is come from the light source of a spectrophotometer. The arrow as in the Figure
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Chemistry June Exam Notes Quantities in Chemical Reactions Molecular and formula mass o The mass of one unit of a compound (a molecule or a formula unit) o The sum of the mass of all the atoms in a compound o With knowledge of the mass of each individual atom‚ the percentage composition by mass can be determined The Mole (mol) o A counting unit‚ one mole refers to 6.02 x 1023 particles of any given substance o Known as Avogadro’s Constant and given the symbol NA Molar Mass o The
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Influence of Concentration on the Activity of Amylase Title Influence of Concentration on the Activity of Amylase Abstract Does more or less concentration speed up the reaction rate of amylase in starch? In this experiment diluted solutions of amylase were created and then tested using a starch solution‚ I2KI for reaction times. The answer to the question was proved to be that more concentration of amylase speeds up the reaction time. Introduction The enzyme‚ amylase is found in
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bottle of perfume is opened at one end of the room‚ then in a short amount of time a person at the other end of the room can detect the scent of the perfume; this is the process of diffusion. Diffusion is a movement from a higher concentration to a lower concentration. A special kind of diffusion is known as osmosis‚ osmosis is fundamental in many industrial processes such a water purification‚ desalination‚ and waste material treatment.
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prepared working standards of dichromate and permanganate using a spectrophototometer iii. To determine the concentrations of permanganate in a mixture of unknown. Abstract: Working standards of dichromate and permanganate were prepared and absorbance for each found. This was done in order to plot a graph of absorbance versus concentration‚ from which the concentration of permanganate and dichromate in the unknown sample could be determined. Sulphuric acid was added to the standards in
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movement will flow into the bag. Also since the dialysis bag’s weight heavily depends on the amount of water‚ the mass will go up when water is gained. The class average for amount of mass gained was 22.55%. A bag that lost mass was the bag with 0% concentration‚ which means it has 100% water. The outside of the bag has 10.57% sucrose and 89.43% water. This makes the outside of the bag hypertonic to the inside‚ resulting in a net flow of water the outside in order to reach equilibrium. By losing water
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solutions and the concentrations of FeSCN2+ at equilibrium was demined by finding the absorbance from the test solutions on the calibration curve and tracing it to their concentrations. The initial concentrations of Fe3+ and SCN- were found using the M1V1 = M2V2 equation along with the concentration of FeSCN2+ used in the calibration curve. Then using the chart that organizes the initial‚ change‚ and equilibrium concentrations of a specific products and reactions; the concentration of Fe3+ and SCN-
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Beer’s Law Lab Hanna Beeter March 15‚ 2013 Honors Chemistry Introduction: In Beer’s law lab the purpose was to find the unknown concentration. The lab included the use of a volumetric flask‚ pipette‚ and spectrophotometer. The spectrophotometer played the biggest part in finding the concentration of the unknown. A spectrophotometer is an apparatus for measuring the intensity of light in a part of the spectrum‚ and is transmitted or emitted on a particular substance. After the number retrieved
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