allows certain molecules or ions to get in or to get out of the cell. There are three types of movement of particals across the cell: diffusion(and also facilitated diffusion)‚ osmosis and active transport. Diffusion and osmosis are passive movements and they don’t require any energy. Active transport requires ATP energy. OSMOSIS is the passive movement of water molecules across a partially permeable (semipermeable) membrane‚ from a region of lower solute concentration to a region of higher solute concentration
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Osmosis Aim: To determine the concentration of cell sap in a potato cell. Osmosis is the movement of water through a semi-permeable membrane. It starts from a weak solution and becomes a more stronger solution until the concentrations on both sides are equal. To investigate the range of solutions needed to find the point at which the surrounding solution is the same as the cell sap in the vacuole.
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1.22 0.86‚ 0.86‚ 1.98 1.23 0.82 2 1.11‚ 1.10‚ 1.26 1.16 0.87‚0.96‚ 0.85 0.89 -23 4 1.26‚ 1.27‚ 1.22 1.25 0.98‚ 1.01‚ 0.98 0.99 -20.8 6 1.50‚ 1.44‚ 1.31 1.42 1.43‚ 1.23‚ 1.36 1.34 -5.63 8 1.41‚ 1.17‚ 1.26 1.28 1.08‚ 1.21‚ 0.97 1.09 -14.84 10 1.29‚ 1.17‚ 1.18 1.21 0.94‚ 1.01‚ 0.96 0.97 -19.83 Table to show the 2nd experiment Sucrose Concentration (%) Mass before
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cell had to draw in extra salt following the substantial weight loss from the 3% salt solution. Thus‚ the cell immersed in the 5% salt solution gained weight following the 3% salt solution. This could be examined further in another study regarding osmosis and weight gain in plant cells. In Figure 2‚ it highlights that the average weight (g) from the individual data had a higher ‘before weight (g)’‚ compared to the class data‚ which had a lower ‘before weight (g)’. It is assumed that this is due to
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Rate of Osmosis vs Solute Concentration Introduction: In nature‚ the quest to reach equilibrium‚ or the state of rest or balance due to the equal action of opposing forces (http://www.dictionary.com). Osmosis and diffusion are two ways that cells reach this equilibrium‚ without exerting energy. Due to the unique nature of the phospholipid bilayer‚ small molecules can pass through the semipermeable membrane easily‚ through diffusion (https://www.biologycorner.com). Water‚ however‚ has a slightly more
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Osmosis investigation Aim: To investigate how sugar concentration affects the mass or size of a potato and find out the sugar solution. Introduction: Osmosis is the movement of water molecules across a partially permeable membrane form a region of high water concentration to a region of low water concentration until the concentration on both sides is equal. This means that osmosis is like diffusion involving water molecules. Osmosis occurs across a partially permeable membrane‚ with holes
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Bean Growth with Different pH Levels Through this experiment‚ the objective was to find which pH liquid created the best environment for the Mung beans to grow. First‚ the beans were placed into bags with different pH liquids. Then‚ measurements were taken each day to monitor the growth average of the beans. The pH 2 beans average size at the end of the experiment were 0.24 cubic centimeters‚ the pH 7 size average was 0.38 cubic centimeters‚ and the size average of the pH 2 beans was 0.24 cubic centimeters
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MEASURING pH Date of Lab: 02/09/13 Date Report submitted: 02/26/13 Purpose of the experiment By doing this experiment‚ we were trying to learn how to measure a pH with a pH meter to determine whether a solution is weakly‚ moderately or strongly acidic or basic; but also to compare the different data founded to see how the addition of certain liquid to a solution may affect the pH of the initial solution. Materials We used: * Tap water‚ distilled water‚ Soda and milk as the main
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Research Question: To investigate how varying the pH of bromothymol blue affects the absorbance value of the solution which determines the equilibrium constant (pKa) of the indicator. Variables: Variables Variables Measured Method of measurement Independent pH of the six buffer solution A pH probe attached to a data-logger will be used to measure pH Dependent Absorption of the buffer solutions at wavelength 435.0nm and 617.0 nm A spectrophotometer (±0.001) will be used to measure absorbance
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The pH Scale is a scale made to show how acidic or alkaline a substance is. The pH of something is measured with pH paper which can vary from wide range paper‚ which covers all ph’s‚ but is not as accurate at some others. There are pH papers that get very specific that can have a range such as 2 or 3 and get much more precise. The neutral on the scale is 7. Anything that is below 7 is considered acidic and anything above 7 is considered alkaline. Acidic substances contain more H+ than OH-. H+
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