assess the concentration of the protein because peptide bonds occur with the same frequency per amino acid in the peptide. The intensity of the colour‚ and therefore the absorption‚ is directly proportional to the protein concentration. Q 2. What is the experimental reason for constructing a standard curve? Multiple samples with known properties can be measured and graphed‚ which then enables the same properties to be determined for the unknown samples‚ in this case the concentration‚ by interpolating
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Dahle Lab 1: Diffusion & Osmosis 9/16/14-9/19/14; Jessica Bullock‚ Andrew Buchholz‚ Kristamae Masiclat TITLE: Different Ways to Express Diffusion and Osmosis INTRODUCTION: Diffusion is the spontaneous movement of a substance down its concentration gradient‚ from a region where it is more concentrated to a region where it is less concentrated. Osmosis is the diffusion of water across a selectively permeable membrane. The objective of this lab is to observe the different effects of diffusion
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Practical Work Nº2: “Different methods to control osmosis” Aim: observe and test the process of osmosis through different kinds of methods: the weigh (potato)‚ the density (beetroot) and under the light microscope (onion). Hypothesis: according to the encyclopedia definition osmosis is the diffusion of a liquid (most often assumed to be water‚ but it can be any liquid solvent) through a partially-permeable membrane from a region of high solvent potential to a region of low solvent potential. Thus
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a potato in a less sweet solution. The hypothesis of the experiment is that we expect more water to move out of the potato placed in the sweet solution than the potato placed in a less sweet solution. Independent variable: concentration of sucrose‚ concentrations: pure water H20‚ 0.1 M‚ 0.5M‚ 1M‚ 2M. Dependent variable: weight of potato sticks‚ original weight 0.7 grams. Controlled variables: the amount of liquid in the beakers and the same type of liquid‚ the time the potato sticks
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Concentration Problem Sets Do the following problems in your lab notebook. Be sure to specify the knowns & unknowns‚ the formulas used‚ show your work with labeled units and round you’re answers to the appropriate significant figures. 15-1 Molarity Problems: (M = moles/ liter ) 1. What is the molar concentration of a 415 ml solution containing 0.745 moles of HCl? (A: 1.80 M HCl) 2. What is the molar concentration of an acetic acid (CH3COOH) solution containing 3.21 moles in 4.50
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Water Concentration in Potato Cells Formal Lab Report Purpose: The purpose of this lab is to determine the concentration of water in potato cells. Method: To complete this task‚ we will first soak our potato cells in different concentrations of sugar solutions. Before we actually soak them‚ we will need to know the initial mass of the potato cores. After soaking‚ we will need to know the mass of the final core. We will use the data we collect to find the percent change in mass of the cores
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University of Wisconsin recommends that if stinging or burning occurs‚ than individuals should cut the amount of salt in half for the solution and decrease frequency of use to every other day. How does that affect the concentration of the solution? When salt is decreased the concentration of the solution measured will also be decreased. This would also decrease the burning and stinging. When the solution is decreased to every other day it could prevent acidosis. 4. Compare and contrast the solutions
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in the oven at 150 degree Celsius for about half an hour and cooled in the desiccator‚ and weighed as barium sulphate and the percentage of sulphate was calculated from the weight of barium sulphate. The Molarity of sulphate= 0.004269 M and the concentration of sulphate in g/L= 0.4098g/L. The weight of barium sulphate was calculated to be 0.0249g. There were also no hiccups during the experiment. (133 words) OBJECTIVE To determine the amount of sulphate by gravimetric analysis. Students can also
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OSMOSIS LAB REPORT INTRODUCTION Osmosis is a special type of diffusion where water molecules move down a concentration gradient across a cell membrane. The solute (dissolved substance) concentration affects the rate of osmosis causing it either to speed the process up or slow it down. Based on this‚ how does different concentrations of sucrose affect the rate of osmosis? If sucrose concentration increases in the selectivity-permeable baggies‚ then the rate of osmosis will increase. MATERIALS AND
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water at all? Today we explore the cause of the sailor’s death. We’ll prepare solutions of salt water to represent the sea‚ and we’ll cut up slices of potato to represent the sailor. Potatoes are made of cells‚ as is the sailor! Objective: The concentration of solute in a solution will affect the movement
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