Week 2 Worksheet – Chapters 3‚ 4‚ and 5 ACROSS 1 The movement of a substance from one place to another due to the substance’s kinetic energy. Diffusion 3 The smallest living structural and functional unit that is enclosed by a membrane. Cell 6 The point at which a substance becomes evenly distributed throughout the solution and the concentration gradient disappears. equilibrium 7 One cell or a group of highly specialized epithelial cells that secrete substances into ducts‚ onto
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power‚ compound microscope. We also can observe the actual structure of plant cells which consists of nucleus‚ vacuole‚ cytoplasm‚ cell wall etc. This experiment indicates the transport across membrane in plant cells when involving water through osmosis. Materials and methods : Materials | Apparatus | Onion Distilled waterTable sugar/sucrose | Small knife Glass slideCover slipMicroscope Filter paperMagnetic stirrer/stirring rodSpatula Beakers (250 ml & 500 mi) | I. Scale off carefully
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M01_ZAO2177_01_SE_CH01.QXD 3/4/11 1:36 AM Page 13 R E V I E W S H E E T EXERCISE NAME_________________________________ LAB TIME/DATE ________________________ A C T I V I T Y 1 1 Cell Transport Mechanisms and Permeability Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. ______________________________________________________ __________________________________________________________________________________________________
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ACTIVITY 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. __The size and the concentration. ___ 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? __ The molecules were to large to go through. My results matched._ 3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your
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mol/L | 2.63g | 2.70g | 2.70% | 9 | 0.2 mol/L | 2.77g | 3.17g | 14.4% | 10 | 0.1 mol/L | 3.10g | 3.55g | 14.5% | 11 | 0.0 mol/L | 2.91g | 3.61g | 24.0% | Discussion: 1. Some potatoes increased in mass while others decreased due to osmosis. Potatoes that had a higher concentration increased in mass because water passed through the membrane into the potato in an effort to dilute it. Potatoes that had a lower concentration than the solution decreased in mass because water flowed through
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The results provide evidence that when there was an increase in the sodium chloride concentration the mass of the potato prisms declined. At the zero percent concentration there was an increase of mass by 1.75%‚ from there the 1%‚ 3%‚ 5% and 10% begun on a downward trend with the percentage change in mass declining. The graph was on a steady decline from 0% being the highest point with a change of mass of 1.75% finishing with the 10% solution on a decline of -12.28%. From observing the scatter plot
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the process by which organisms balance water‚ or solvent‚ concentrations with salt‚ or solute‚ concentrations in tissues and cells (Campbell). Organisms must perform this process of regulation because of the “Fick’s Law of Diffusion”‚ also called osmosis‚ which states that‚ “The flow of solvent from a solution of lower solute concentration to one of higher solute concentration” will occur. This means that in an organism water will cross a semi-permeable layer‚ tissues in cell walls in this case‚ from
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Experiment 5 Title: Membrane Permeability Objectives: 1. Define solvent‚ solute‚ solution‚ selectively permeable‚ diffusion‚ osmosis‚ concentration gradient‚ equilibrium‚ turgid‚ plasmolyzed‚ plasmolysis‚ turgor pressure‚ tonicity‚ hypertonic‚ isotonic‚ hypotonic; 2. Describe the effects of hypertonic‚ isotonic‚ and hypotonic solutions on Elodea leaf cells and onion scale leafs. Introduction: Membrane permeability is a quality of a cell’s plasma membrane that allows substances to pass in
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ACTIVITY ONE- Cell Transport Mechanisms and Permeability: Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. Molecular weight affects the rate of diffusion because the bigger the size of the molecule the longer it will take to diffuse. Membrane size is another variable that affects the rate of diffusion because if the membrane’s pores are small it will take molecules longer to diffuse though it than if the pores were larger. Also‚ membrane thickness
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Investigating the water potential of a potato Aim Osmosis is the movement of water molecules from a region of high water concentration to a low water concentration through a semi-permeable membrane. Our aim is to investigate the water potential of a potato through osmosis‚ by finding the difference in weight before and after the potato has been set in a solution of water‚ sugar or salt. Trial Method Firstly we collected the equipment. This included a scalpel‚ potato cutter‚ and test tubes. Then
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