"Concentration" Essays and Research Papers


Explain on how to prepare 30ml of 0.95% ( w/v ) NaCl Ans : Given that units of “%(w/v)” which is the percent weight/volume gives the weight of substance relative to the volume of solution, where 1%(w/v) / 1 g/100 ml. Thus, given a final concentration of a chemical assuming it is started with a pure, dry substance and the required final volume, gram of the chemical is such that the final volume (ml) x fractional weight. Hence to prepare a 30 ml of 0.95% NaCl: 30 x 0.0095 = 0.285g of NaCl is...

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Determining Concentration of a solution Lab

Determining the Concentration of a Solution: Beer’s Law Purpose: The purpose of the experiment is to determine the concentration and formula of an unknown cobalt nitrate solution by measuring absorbance. Introduction: A Colorimeter will be used to determine the concentration and formula of an unknown cobalt nitrate solution. The colorimeter sends blue light from the LED light source to pass through the solution and hit a photocell. A solution with a higher concentration will absorb more...

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Solute Concentration of Potatoes

Solute Concentration of Potatoes Block 2-2 Purpose: To determine the concentration of solute in the potato’s cytoplasm by measuring the change in mass after the process of osmosis. Materials and Equipment: Refer to Biology 12 Lab Manual – Investigation 13 Procedure: Refer to Biology 12 Lab Manual – Investigation 13 Data and Observations: The Potatoes change in mass after the process of Osmosis Test Tube # | Concentration of Sucrose...

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Spectrophotometer: Concentration and Standard Curve

protein concentration of an unknown sample of BSA, and by using the standard curve. Abstract A spectrophotometer’s purpose is to use colors of the light spectrum to determine the concentration of light absorbing molecules in a solution. (p.59) In this particular lab, our mission was to determine the protein concentration and the standard curve of the unknown sample of BSA. This, by preparing five dilutions of the unknown solution of BSA together with other known concentrations, and then...

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Colorimeter -Concentration of a Solution

Concentration of a Solution: Beer’s Law The objective of this experiment is to determine the concentration of an unknown copper sulfate solution. You will be using the Colorimeter. In this device, red light from the LED light source will pass through the solution and strike a photocell. A higher concentration of the coloured solution absorbs more light (and transmits less) than a solution of lower concentration. The Colorimeter monitors the light received by the photocell as either an absorbance...

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The Effects of Concentration on Osmosis

Introduction: This experiment was used to examine the hypothesis that: Osmosis is dependent on the concentrations of the substances involved. Diffusion is the passage of solute molecules from an area of high concentration to an area of low concentration (Campbell & Reece, 2005). An example is ammonia diffusing throughout a room. A solute is one of two components in a chemical solution. The solute is the substance dissolved in the solution. The solvent, the other component, is any liquid...

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Osmolarity: Concentration and Sucrose Solutions

different concentrations of sucrose solutions have an effect on the final weight for the potato tubers?” In this experiment we estimated the osmolarity of potato tuber cores by submersing different potato cores into sucrose solutions of 0.0-0.6M, and weighing the potato. The results showed the weight of the potato tubers had the highest percent change in weight meaning that they weighed more than the initial weight in sucrose solutions from 0.0-0.3M; it also showed that sucrose concentrations from 0...

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Direction and Concentration Gradients

Direction and concentration gradients Bradley Benton ABSTRACT In this experiment, we will investigate the effect of solute concentration on osmosis. A semi‐permeable membrane (dialysis tubing) and sucrose will create an osmotic environment similar to that of a cell. Using different concentrations of sucrose (which is unable to cross the membrane) will allow us to examine the net movement of water across the membrane. INTRODUCTION A major determinant of diffusion in a biological system is membrane...

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Osmosis: Concentration and Potato Tissue

membranes with little difficulty. This process is known as osmosis. The direction of motion is regulated by the relative concentrations of water and dissolved substances inside and outside the cell. Water will move from an area of high concentration of water molecules (low concentration of dissolved particles) to an area of low concentration of water molecules (high concentration of dissolved particles). It is difficult to observe osmosis at the cellular level since cells are very tiny and can only...

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Determining the glucose concentration in Sprite

Name: Raj Bose Date: 23/1/2015 Partners: Sunniva & Bayu Determining the concentration of glucose of 7UP Glucose solutions prepared as follows:- In each case 250.0 cm3 volumetric flasks used Concentration (%) Mass/g 4.00 10.00 8.00 20.00 12.0 30.00 16.0 40.00 20.0 50.00 Table: 1- Recording of concentration, volume, and qualitative observations of various solute/solvent/solution used during the experiment. Name Concentration (%) Volume (ml) Qualitative Observations Glucose (C6H12O6) 5 different types:...

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Osmosis: Concentration and Water

Osmosis Lab: Potatoes and Elodea Background Information: Cells have a need to regulate their internal environment. They need to be able to this because cells often find themselves in environments where the concentration of dissolved solids outside the cell is different from the number of dissolved solids inside the cell. Since the solids can not move across the membrane, the cell responds by moving water either into or out of the cell in an attempt to balance the number dissolved particles...

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Effect of Varying Concentration of H2O2

Analyzing the effects of varying hydrogen peroxide (H2O2) concentrations on the volume of its drop Jonah Jemina IB Chemistry SL 11 Mr. Eastwood Analyzing the effects of varying hydrogen peroxide (H2O2) concentrations on the volume of its drop Jonah Jemina Introduction: Hydrogen peroxide is a clear and colourless substance that has a strong oxidizing characteristic. From the books, “Hydrogen Peroxide: Medical Miracle”[1995] by Douglass and “Applications of hydrogen...

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Internal Assessment on Enzyme Concentration

Internal assessment on enzyme concentration Enzymes are proteins that act as catalysts and they are the most important type of protein. My aim in this experiment was to investigate the effect of enzyme concentration on the rate of an enzyme (protease) – catalyzed reaction , catalysts speed up chemical reactions . My hypothesis is that the rate as reaction will increase as the concentration of protease in the solution increases so it will take less time for...

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Determination of Critical Micelle Concentration

| Determination of the Critical Micelle Concentration | | | | Introduction: Purpose: The purpose of this experiment is to use the Conductometric method to determine the critical micelle concentration of SDS. Materials and Equipment: * SDS- Sigma Aldrich, Lot: 38H0080, S/N: L-439, * NaCl- Food grade Great Value * SDS 20% solution- Fisher Biotech, S/N: BP1311-200, Lot: 468059 * Wave generator- Pasco Scientific, S/N PI-9587C * Ammeter- Keithley Auto-ranging...

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Concentration, Solution, Density

It also created solutions containing varying levels of concentrations and densities. Equations were used to figure the molecular weight of the sugar, and the number of moles of sugar in the volumetric flask. There was also an equation to figure the Molarity, as well. As a result of the experiment, I now have a better understanding of the density of a concentration, and what Molarity is . Observations Data Table 8: Initial Concentration Chemical Mass (g) Molecular Weight (g) Moles in Volumetric...

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The Effect of Different Salt Concentrations on Osmosis

The effect of salt concentrations on the mass of the pear cubes ‘Pyrus’ after being soaked in water Aim: The effect of salt concentrations on the mass of the pear ‘Pyrus’ pieces shaped as cubes of 1cm. Background: Osmosis is the net movement of water molecules through a semi-permeable membrane from an area of higher water potential to an area of lower water potential. Water makes up to 70-90% of living cells and cell membranes are partially permeable membranes. Dissolved substances attract...

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The Effect of Salt Concentration on Osmosis in Potato

the molecules may have been moving slower. Part B: Title: The effect of salt concentration on osmosis in potato. Introduction: 1. The purpose of doing this lab is to observe the effects of various solute concentrations on osmosis in a potato. 2. During osmosis, water moves from the side of the membrane where they are most concentrated to the side where they are less concentrated. If the concentration is equal on both sides, there will be no movement. 3. I hypothesize that...

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How the Concentration Affects the Rate of the Reaction

For this data analysis project, I conducted and experiment to investigate how the concentration of an acid affects the rate of the reaction. I have set up the experiment’s equipment as shown on figure 1. As you can see by figure 1, I have used the reaction between sodium thisoulphate solution and hydrochloric acid (HCL) to come up with results that will help me draw conclusions regarding the effects of the concentration of the acid. I decided to use this particular reaction due to the fact that the...

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solution colour and ion concentration investigation

Investigation - Solution Colour and Ion Concentration Aim: To investigate whether solution colour can be used to reliably determine the concentration of coloured ions in a solution. Hypothesis: the concentration of permanganate ions in the solution is inversely proportional to the percentage transmission of light through the solution. Dependent variable: concentration of permanganate ions. Independent variable: percentage transmission of light through the solution. Equipment: 20 ml...

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The Effect of Concentration of H2O2 on the Docomposition of Hydrogen Peroxide

What happens? For many reactions involving liquids or gases, increasing the concentration of the reactants increases the rate of reaction. In a few cases, increasing the concentration of one of the reactants may have little noticeable effect of the rate. These cases are discussed and explained further down this page. Don't assume that if you double the concentration of one of the reactants that you will double the rate of the reaction. It may happen like that, but the relationship may well...

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Quantitative Determination of Protein concentration using the biuret test

Winny Stephanie Experiment 1: Quantitative Determination of Protein Concentration Using the Biuret Test Table 1: Experimental protocol for construction of the protein standard curve Tube 1 2 3 4 5 6 Buffer (ml) 1.0 0.8 0.6 0.4 0.2 0.0 BSA Protein solution (10 mg ml-1) (ml) 0.0 0.2 0.4 0.6 0.8 1.0 Biuret reagent (ml) 4.0 4.0 4.0 4.0 4.0 4.0 Total Volume (ml) 5.0 5.0 5.0 5.0 5.0 5.0 Final protein concentration (mg ml-1) 0 2 4 6 8 10 Absorbance 0.000 0.092 0.163 0.272 0.363 0.474 Table...

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Practical Report: Determination of Concentration Using a Standard Curve

Practical report: Determination of concentration using a standard curve Introduction Spectrophotometer is an instrument that confirms the measurement of specified wavelength of light that passes through medium. The measurement of light absorbance by a solution is also done with spectrophometer. Absorption spectrum Spectrometers are mainly and widely functional in identifying the components of solutions that helps determine the components’ concentrations. Compounds are experimentally identified...

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Increasing Sucrose Concentration Deceases Change in Mass of Potato Tuber Segments; Relative Osmotic Concentration Determined by Percent Change in Mass

Results The relative osmotic concentration was determined by measuring the percent change in mass of the potato tissues. Change in mass was measured of six solutions, each containing different levels of concentration (0, 0.1, 0.2, 0.3, 0.4, and 0.5). The percent change in mass decreased as sucrose concentration increased, therefore, relative osmotic concentration also decreased as sucrose concentration increased. However, the osmotic concentration of 0.2 M sucrose solution was relatively greater...

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Lab Report: Relationship between Concentration and Absorbance

involves measuring the absorbance of several concentrations of the pure substance or the "standard" substance determine relationship between concentration and absorbance compared results from unknowns How to use Linear Regression for Generating a Standard Curve? © 2010 by M. Olaveson UTSC 2 BIO A01F-Fall 2010 - ASSIGNMENT # 2 - Preparing a Standard Curve using Excel 2007 Assignment # 2 Analysis of Data from Lab 2-Exercise 2 Table 2.6. Protein in Test Tubes prepared for...

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Investigating the Effect of Lipase Concentration on the Breakdown of Fat in Milk

Investigating the Effect of Lipase Concentration on the Breakdown of Fat in Milk INTRODUCTION: Enzymes are proteins which can catalyse chemical reactions without changing themselves. The enzyme lipase breaks down the fat in dairy products such as full-cream milk for people who are lactose intolerant. Lipase acts on its specific substrate, lipids produces fatty acids. If enzyme concentration increases, random collisions between the substrates and active sites of enzyme increase due to the increasing...

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Effect of Solute Concentration on Osmosis in Potato Cells Report

INTRODUCTION Osmosis is the movement of water molecules from high concentration to low concentration through semipermeable membranes, caused by the difference in concentrations on the two sides of a membrane (Rbowen, L.). It occurs in both animals and plants cells. In human bodies, the process of osmosis is primarily found in the kidneys, in the glomerulus. In plants, osmosis is carried out everywhere within the cells of the plant (World Book, 1997). This can be shown by an experiment with potato...

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Effect of Concentration on Enzyme Activity Lab Report

Lab Report (Effect of concentration on enzyme activity) Biology Noor Alawadhi 11- KC Introduction: An Enzyme is a protein, which is capable of starting a chemical reaction, which involves the formation or breakage of chemical bonds. A substrate is the surface or material on or from which an organism lives, grows, or obtains its nourishment. In this case it is hydrogen peroxide. This lab report will be explaining the experiment held to understand the effects of the changes in the amount of...

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Effect of Different Concentrations of Salt on Potato Cell Mass

water molecules from a region with high concentration to a region with low concentration. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules such as water through but does not allow bigger molecules to pass through. This process will take place until it reaches the equilibrium state, which means that the water molecules will be distributed until there are no regions with high or low concentrations. Plant cells have a protective layer—called...

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Osmosis lab/ concentrations of solutions effect on potatoes mass.

"Do different concentrations of solutions determine the mass of a potato?" Introduction: The way to get the full results of this lab was through the process of osmosis. Osmosis is the movement of water across a membrane into a more concentrated solution to reach an equilibrium. When regarding cells osmosis has three different terms that are used to describe their concentration. The first of these words is isotonic. Cells in an isotonic solution show that the water has no net movement and the amount...

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Experiment to Shoew the Effect of Different Concentration of Glucose on Potato Strips

EXPERIMENT TO SHOW THE EFFECT OF DIFFERENT CONCENTRATION OF GLUCOSE ON POTATO STRIPS INTRODUCTION: Molecules of liquid and gas are constantly in motion, they move randomly in all directions and bounce around in all directions and bounce around and into each other. As they move, they tend to spread out moving from areas with many molecules to areas with fewer molecules . This process of spreading out is called Diffusion, for example smell of cooking travelling around the house from the kitchen...

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Goal Setting & Concentration: Two Important Pst Skills

Setting & Concentration: Two Important PST Skills Psychological skills training are an important part of training programs in sports and in other areas of life. Goal setting is one particular area of a psychological skills training that is very important. Another very important area of psychological skills training is concentration. These are the two areas that I have chosen to focus on so that I believe can achieve the optimal level of performance in academics. Goal Setting and concentration go hand...

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Biology Investigation: Effect of Different Concentrations of Sucrose Solutions on Potatoes

Biology Investigation: Effect of different concentrations of sucrose solutions on the mass of potatoes Research question Is the mass of potatoes going to be smaller or bigger in different sucrose concentration? Introduction Osmosis is a process that occurs at a cellular level that entails the spontaneous net movement of water through a semi-permeable membrane from a region of low solute concentration to an area of high solute concentration in order to equalize the level of water in...

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Investigating the Effect of Enzyme Concentration on Pectinase in the Production of Fruit Juice(Biology)

Investigating the Effect of Enzyme Concentration on Pectinase in the Production of Fruit Juice In this practical, I shall demonstrate the relationship between the concentration of pectinase and the amount of fruit juice produced accordingly in proportion. Apparatus: Apples Pectinase solution 10 x filter paper Knife or kitchen mincer Glass rod Water bath X 1 250 ml beakers X 2 Wash bottle of distilled water 100 cm^3 measuring cylinders In the case...

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Osmosis and Diffusion on Different Concentrations of Sodium Chloride on a de-Shelled Chicken

the spontaneous kinetic movement by which molecules move from an area of a high concentration to an area of low concentration. Diffusion continues until it reaches equilibrium. Osmosis is similar to Diffusion but it’s the process in which water moves across a semi-permeable membrane and goes to the higher concentration of solute.1 2.2. Important factors to Osmosis and Diffusion include Temperature, Concentration and Surface area to volume ratio. Temperature can affect the rate in which a solute...

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Determining the Solute Concentration of a Potato, Gcse Ocr 21st Century Biology Coursework

Determining the Solute Concentration of a Potato Aim: In this investigation I am going to work out the sugar concentration of a potato. I aim to find this out by putting potato cores into various concentrations, measuring the mass before and after. Due to osmosis the potato cores will change in mass to make the concentrations at an isotonic level, helping us to work out the mass of the potato. I predict that potato in the weaker solutions will gain mass, because some water will be absorbed by the...

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To compare the concentration of vitamin C in different brands of orange juice.

Practical Task: To compare the concentration of vitamin C in different brands of orange juice. Juice sample provided: 0.1% vitamin C solution, fresh orange juice, You C 1000 orange water. Aim of investigation: To compare and verify the amount of vitamin C in Mr. Juicy and You C 1000 orange juice. Introduction: Problem: To compare the concentration of vitamin C Hypothesis: Concentration of vitamin C in Mr. Juicy is about 0.02 % Concentration of vitamin C in You C 1000 orange water...

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To investigate the effect to the potato cells in the different solute concentration water

Aim: To investigate the effect to the potato cells in the different solute concentration water Introduction; Water can move through the different cells due to the difference of water potentials in the cells. If there is a higher solute concentration in the cell than outside the cell, the water will move into the cell. However, if the concentration of inside the cell is lower than the outside, water will not move into the cell. This process is called osmosis. Research question; This investigation...

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How does the relationship between salt concentration effect osmosis in the aquatic plant Elodea?

How does the relationship between salt concentration effect osmosis in the aquatic plant Elodea? Quantitative data From observing the cells under a microscope, we see that they are continuously moving and therefore are alive. We have observed that when the cells are in the 10% sodium chloride, the chloroplasts are positioned to the sides of the cell wall and the cytoplasm is more expanded. Cells in the distilled water are slightly smaller than the cells in the sodium chloride solution...

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Concentration Affects the Rate of Oxygen Production When Raw Liver (Catalyse), and Hydrogen Peroxide Is Mixed

Preliminary Experiment (4% yeast concentration) Hydrogen peroxide volume – 5 cm3 Water Volume -0 cm3 Concentration Volume- 20 vols Time in Seconds Volume of O2 (cm3) Experiment 1 Experiment 2 Average 30 95 94 94.5 60 100 100 100 90 100 100 100 120 100 100 100 150 100 100 100 180 100 100 100 Modifications The results from my preliminary experiment show that 100 cm3 of oxygen has been produced in the first 30 seconds.. This reaction is far too quick and will prevent me from analysing...

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The Effect of Solute Concentration on Osmosis in Potatoes.

investigation: The effect of solute concentration on osmosis in potatoes. Research question: What is the solute concentration of a potato? Hypothesis: Osmosis is the movement of water across the membrane from an area of high concentration to an area of low concentration. The osmosis continues until the solute concentrations are equal in both areas. In this experiment, we put pieces of potatoes into test tubes with sugar solutions of different concentrations and leave them there over night. It...

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Seller Concentration

Level 2 2010/11 ‘Seller concentration levels are of interest on both theoretical and public policy grounds’. Discuss. Market structure plays an important role in any industry. Examining the market structure is essential for firms to perform well and behave rationally. The key characteristics of market structure include the number and size of firms, the existence and height barriers to entry and exit, and the degree of product differentiation. Seller concentration refers to the number and level...

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Biolab 1208 Lab Report

sole intellectual property. It does not contain the ideas or writing of other individuals/authors. _Alexandra DeWitt_____________ __5/1/13____________ Author Date _10_________ Lab Section # Increasing Sucrose Concentrations Causes the Osmotic Concentrations of Disks of Potato Tubers to Decrease Abstract: Introduction: The biological membranes are composed of phospholipid bilayers, each phospholipid with hydrophilic heads and hydrophobic tails, and proteins. This arrangement of...

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Lab #1: Density Determinations for Solutions

units of density are quoted in (g/mL) for liquid samples of matter. For that reason if the volume is known of a liquid, determining its density is easily determined by weighing it accurately. Density can also be used as a tool for finding the concentration of solutions in some cases. The density is different in a substance when a substance is added to a pure liquid to when both the solute and solvent were separate all together. There are many ways to determine density. This method determined the...

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Osmosis & Diffusion Review Sheet

molecules osmosis vacuole water solute permeable towards semi-permeable concentration gradient 1. The cell membrane regulates and controls what kind of molecules ______ move in & out of the cell. 2. When molecules spread from an area of high to low concentration, it is called _Diffusion_____. 3. As molecules diffuse, they create a _concentration gradient_____, which is a difference in concentrations across space. 4. Cell membranes are _semi-permeable_____. This means that they...

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Cell Transport Mechanisms and Permeability

A with the appropriate term in Column B. Column A Column B __E__ term used to describe a solution that has a lower concentration of solutes compared to another solution _G___ term used to describe a solution that has a higher concentration of solutes compared to another solution _A___ the movement of molecules from an area of higher concentration to an area of lower concentration as a result of random thermal motion _D___ the movement of molecules across a membrane that requires the expenditure...

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Osmosis in Egg

Quail’s Eggs Research Question What is the effect of different concentrations of sodium Chloride (NaCl) on the mass of the de-shelled quail’s eggs? Introduction Osmosis is an example of passive transport. Osmosis is defined as the movement of water molecules, down its concentration gradient, from an area of high water concentration (low solute concentration) to an area of lower water concentration (high solute concentration) through a selectively permeable membrane. Osmosis doesn’t need energy...

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Lab Cell Membrane

is an active energy that is always in motion. Molecules move in all different ways and this create an evenly distributed movement which is best known as diffusion. Diffusion is the movement of molecules from a region of their higher concentration to a lower concentration. METHODS Check the reaction of different compounds with the dialysis membranes and the deionized water in order to see if the compounds present diffusion and at what rate. RESULTS DISCUSSION 1. Describe two variables...

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Chemistry Rates of Reaction Coursework: Sodium Thiosulphate and Hydrochloric Acid

thiosulphate is affected by the concentration of the acid Simple Procedure Place a conical flask on a piece of paper with a cross on it. Add hydrochloric acid and sodium thiosulphate, and record the amount of time taken for the cross to disappear through the solution from the top of the flask. Record this time and repeat this for different concentrations of hydrochloric acid. Fair Test The variables in this test are: • The concentration of hydrochloric acid • The concentration of sodium thiosulphate ...

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Biology Osmosis Lab Report

experiment was to test the effect of the concentration gradient on the diffusion rate. It was hypothesized that the greater the stronger the concentration gradient, the faster the rate of diffusion would be. To test this, dialysis tubes were submerged in different concentration fructose solutions. We weighed the tubes at specific time intervals to measure the rate of diffusion of water in each different solution. The results illustrated that increased concentration gradient increases the rate of diffusion...

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Absorbance of Light vs. Concentration of Colored Solution Introduction: Performing this lab showed the importance of light in virtual drug screening because light can be used in a variety of ways to obtain different kinds of information in research. Light can be used to determine the concentration of DNA or protein in solution, tag different objects such as cells, protein structures, or bacteria in order to determine whether there is a large amount of a certain substance, and to determine the size...

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Determination of an Equilibrium Constant

Principle, Beer’s Law and Spectrocopy. The first reaction was run to completion using LeChatier’s Principle and the second reaction was run to equilibrium. A spectrophotometer was used to measure absorbances. Using a graph of absorbance versus concentration of FeSCN2+ was used to determine that the molar absorptivity constant was 3670. Beer’s Law was used to determine that the average equilibrium constant was 33.1793. Introduction: The purpose of this experiment is to determine the value of the...

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Physioex 8.0 Exercise 1

| |concentration of solutes compared to another solution |b. facilitated diffusion | | |c. osmosis | |__G__ term used to describe a solution that has a higher |d. active transport | |concentration of solutes compared to another solution ...

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Diffusion of Osmosis

their higher concentration to their lower concentration, water will move across the membrane in response to this concentration. While conducting this lab we were able to observe passive transport through diffusion and osmosis. Introduction Osmosis is a specialized case of diffusion that involves the passive transport of water. When osmosis occurs water moves through a selectively permeable membrane from a region of its higher concentration to a region of its lower concentration. The membrane...

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Biology Lab on Osmosis

Michelle Kim 2012.1.20 Biology Iso-osmolar Concentration of Carrot Cells Lab INTRODUCTION For a more thorough understanding of this lab introduction, the concepts of, iso osmolar, membrane, equilibrium, and concentration gradient evaluated. Iso osmolar can be known as the point in which the substance of experimentation faces no change despite the amount of solute inside the solvent( because the solvent and solute concentration is equal. This is where the line on a graph would cross on the...

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Spectrophotometric Determination of an Equilibrium Constant

complex [Fe(SCN)]2+. Fe3+ + SCN- ( [Fe(SCN)]2+ The equilibrium constant expression may be expressed as: K = [pic] You will prepare a series of standard solutions that contain known concentrations of [Fe(SCN)]2+ and will determine their absorbances at 447 nanometers. The concentrations and absorbance values will be used to construct a calibration graph for [Fe(SCN)]2+. In the second part of the experiment, various combinations of Fe(NO3)3 and KSCN will be combined. The amount...

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Physio Ex 9.0 Exercise 1

greater than the 200 MWCO. 4. For molecular weight: Sodium chloride < urea < glucose < albumin Activity Two: 1. Facilitated diffusion is similar to simple diffusion in the fact that it transports solutes from an area of high concentration to an area of low concentration; however it differs from simple diffusion because for the solute to pass, a protein transporter is required. 2. The increased number of glucose transporters allowed for an increased rate of glucose transport because more glucose...

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Beers Law

prepare a Beer’s law plot. Molarity of these samples was also calculated to determine concentration and percent error rate. Students also analyzed the concentration of blue dye #1 to determine the concentration of blue dye #1 in a commercial blue dye drink.   Procedure Exercise #1 Step #1: Convert %T (Table 1) to absorbance and prepare a Beer’s law plot using the data. Step #2: Determine the concentration of M of the samples in table 2: A=ebc A= 2-log(%t) B= 1.0 cm Solve for E E=1875 ...

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Spectrophotometer Lab Report

study the relationship of absorbance and concentration, the interaction of electromagnetic radiant energy(ERE) and matter which is an important aspect of the Beer-Lambert's Law. This law states that the absorption of a compound is directly proportional to the concentration of that particular compound. This is because (a & b) are constants. In the equation, A = abc where A is the absorbance, a is the specific absorbance, b is the path length, c is concentration. This report presents the procedures for...

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Abstract The purpose of this experiment was to test different solute concentrations on the rate of osmosis. Artificial cells were filled with different solute concentrations and placed in water and weighed at equal time intervals to show how the water moves across cell membranes and down its concentration gradient into the lower concentrated area. The weights of the cells were recorded each interval, and then the rate of osmosis was found by calculating the corrected cumulative change in weight...

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Biology Lab

TOPIC: Food Tests – Semi Quantitative Test AIM: To determine the concentration of glucose present in an unknown sample, using a semi quantitative glucose test APPARATUS AND MATERIALS: 4% stock solution of glucose, water, 6 test tubes, ruler, water bath, solution of unknown concentration (Sample A), Benedict’s reagent METHOD: 1. Solutions of different concentration were made from the stock solution and placed in test tubes. ...

Free Chemistry, Color, Concentration 807  Words | 3  Pages

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