Aim: To observe and describe an example of osmosis. Hypothesis: I predict that the water level will rise as the iodine stained water moves through the cellulose bag due to osmosis. The iodine is there so we can see this happening. Materials: * Dialysis(cellulose) tubing * Thistle funnel * Gas jar * Retort clamp and stand * Rubber bands * 50mL beaker * Iodine/potassium iodine solution * 5% starch solution Method: 1) Fill the gas jar to 3 quarters full with
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BIOLOGY OSMOSIS LAB REPORT 1. Research Question/ Aim How do the different sodium chloride concentrations of solutions affect the length (measured in mm) and mass (measured in grams) of potato cores placed in them overnight (approximately 10 hours)? 2. Hypothesis Alternative hypothesis: As the concentration of sodium chloride in the solution increases‚ the mass of the potato cores will decrease. If the solution they are in has a lower water potential than the potato cores‚ there will be
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temperature have on the rate of diffusion? How did molecule size affect the rate of diffusion? What happens to the rate of diffusion over time? Why? What can you conclude from this experiment? II. Osmosis Define the following terms. Osmosis EXERCISE 2 – Osmosis demonstration After 15 minutes‚ record the volume change in each tube. Osmometer Dialysis Tube Contents Beaker Contents Volume Fluid Moved Direction of Movement 1 2 Describe the net movement
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BIOLOGY – TRANSPORT ACROSS MEMBRANE define diffusion and describe its role in nutrient uptake and gaseous exchange in plants and humans define osmosis and describe the effects of osmosis on plant and animal tissues define active transport and discuss its importance as an energy-consuming process by which substances are transported against a concentration gradient‚ as in ion uptake by root hairs and uptake of glucose by cells in the villi . A cell is surrounded by a layer of cell surface membrane
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and Isotonic Solutions Affect the Water Movement of a Cell? Purpose: The purpose of this activity is to teach students about osmosis and the effects of hypotonic‚ hypertonic‚ and isotonic solutions on animal cells. This lab is designed for high school biology students but may be adapted for middle school students. Objectives: The students will be able to describe osmosis and differentiate between the effects of hypotonic‚ hypertonic‚ and isotonic solutions on animal cells and determine the equilibrium
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Solutions Offered by Rochem in Various Platforms 1. Reverse Osmosis: It is one of the most widely used technologies to treat industrial waste water. It has been commonly used to remove salts and various other impurities so as to improve the parameters such as pH‚ biological oxygen demand‚ chemical oxygen demand. This technology is already on the rise because of its efficacy and cost efficiency. Reverse Osmosis is a phenomenon wherein water is separated from a solution of dissolved solids by the
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short time‚ the final results showed that the more water the potatoes were placed in‚ the more hypotonic the potato becomes. Tonicity is stated to be the state of a solution in respect of osmotic pressure. Types of tonicity used in this lab are osmosis and diffusion. In a way these two solutions are somewhat similar but differ in the way that diffusion refers to the movement of any chemical from one place to another‚
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OSMOSIS Aim To determine the water potential of potato tuber cells. Background knowledge Osmosis is defined as the movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane. Osmosis is considered in terms of water potential and solute potential. Water potential is a measure of the kinetic energy of water molecules. Here‚ water molecules are constantly moving in a random fashion. Some of them collides with cell
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Membrane Transport Objectives ► Referring to energy‚ what two ways can substances enter a cell? What is active transport? What is passive transport? How is osmosis related to diffusion? How can we demonstrate active transport? How can we demonstrate Brownian movement? How can we demonstrate diffusion (2 ways)? How can we demonstrate osmosis (3 ways)? In terms of relationships between substances‚ how can we define “hypertonic”‚ “isotonic”‚ and “hypotonic”? What is the relationship between the size
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gradient must be suitable with the pore size of each membrane because the loss of permeate flow is an undesirable condition for this experiment. After finishing the experiment‚ the volume of water collected increases according to the sequence of reverse osmosis‚ nanofiltration‚ microfiltration and ultrafitration.
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