solvent. This experiment is specifically designed to measure the solubility of sodium hydroxide in waters of different temperatures.! ! Hypothesis! Higher temperature of water allow the particles of sodium hydroxide(s) more mobility between the solution and their solid state because the particles are absorbing energy from their surrounding. Therefore‚ higher the temperature of water‚ higher the solubility of sodium hydroxide. ! ! Table of variables! Variable measured Dependent Variable
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Lab Report #1 Introduction A cell’s plasma membrane is known to be selectively permeable. This implies that the membrane is selective on what substances can pass in and out of the cell. There are two methods of transport that occur through the plasma membrane. One method of transport is called active process which uses ATP energy to transport substances through the membrane. The other method is called passive process which does not require the use of ATP energy. During passive processes
Free Diffusion Molecular diffusion Solution
examine the effect different concentrations of sucrose solution has on the movement of water across the cell membrane. Hypothesis: That the potatoes will either increase or decrease in mass‚ due to the effect of the different concentrations. Osmosis will occur. Apparatus: * Fresh potatoes * Apple corer * Scalpel * Petri dishes X 10 * 50ml measuring cylinder * Distilled water * Paper towelling * Sucrose solutions: * 1.0M * 0.8M * 0.6M * 0.4M *
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across the membrane in one direction than the other (Hayden and McNeil 2012). During osmosis the net movement of water molecules will be from a solution that has a lower osmotic concentration to a solution that has a higher osmotic concentration. When a solution has a higher concentration of solute within the cell than out‚ it is called hypertonic. When a solution has a lower concentration of solute within the cell than out‚ it is called hypotonic. And when there are equal concentrations inside and out
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of a solution of a given compound and its concentration. This is normally expressed as . A = Absorbance measured = Absorptivity C = Molar concentration L = Length of cuvette Equipment: • Gilson pipette • Eppendorf tubes • Copper sulphate • Spectrophotometer • Cuvettes • Distilled water Method: 1. Use a Gilson pipette to measure out five different solutions of copper sulphate and distilled water. 2. Pour into a 1.5ml test tube‚ label each tube 1 to 5 to indicate each solution and place
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Add 200ml of distilled water‚ 40ml sucrose solution and 5g salt into three beakers respectively. Record the solutions concentrations‚ volumes‚ and weights. ②Use a cutter to cut the potato to the similar size. Record the weight of pieces potato. ③Put the three potatoes slice into each beaker. Cover the beakers with glass covers and leave them for 48 hours. ④Carefully remove the potato slices from the distilled water solution & pat it dry on a paper towel. Weight the potato slices immediately
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to develop a method for determining the concentration of three different diluted copper (II) ion solutions. We also tried to determine the concentration of copper within a penny by dissolving it in nitric acid. We used a spectrometer to measure the %Transmittance of each and were able to convert it to it absorbance in order to plot it on our calibration curve. We used test tubes to contain the solution and set the spectrometers to 20‚ which were preset by the TA. Prepare three different beakers
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Abstract: During the lab a better agent for absorbing Procion Red Dye was trying to be found. Using the different dilutions of a stock solution and a spectrophotometer an Absorbance vs. Concentration graph was created and using the trendline from that graph it was determined which agent‚ zeolite‚ magnetic zeolite‚ or charcoal were better at absorbing the dye. From the results collected it was found that charcoal was the best at absorbing the dye‚ when moles of dye per gram of agent used were calculated
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challenges? What solutions has it chosen? Are there any solutions that the company hasn’t considered? Google has partially identified the challenges it faces‚ but then again‚ can always use more improvement to ensure that they stay ahead of the competition. On several occassions the company has chosen to approach these challenges head on making sure to correct the problem directly and making sure that the solution works and that customers are satisfied. Google has had several solutions to its problems
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that passing through. Biological substances such bromophenol blue and methyl orange‚ are the common substances to be used in testing of interaction of substance with the light. These solutions called pigments where they usually can absorb the visible of light that passing through it. The cleared compounds or solution also can absorb the light that is not seen through the naked eyes. The wavelength specifically used to test the absorbance level is 400 to 600 those are in nanometer unit‚ in this experiment
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