Examining Diffusion and Osmosis Introduction: Purpose: 1. To simulate and observe the diffusion of solutes and the osmosis of water through a semipermeable membrane through color change and sugar tests. 2. To speculate osmosis occurring in dialysis bags and potato cores by comparing percentage change in masses. Background information: Molecules are always in random‚ constant movement due to their kinetic energy. This causes the molecules of a cell to move around and bump into each other
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Osmosis Rates in Artificial Cells Daniel George Department of Biology Grand Valley State University 1 Campus Drive Allendale‚ MI 49401 georged@mail.gvsu.edu Abstract The lab for this paper was conducted for the topic of osmosis‚ the movement of water from high to low concentration. Five artificial cells were created‚ each being filled with different concentrated solutions of sucrose. These artificial cells were placed in hypertonic‚ hypotonic‚ or isotonic solutions for a period of 90
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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 in
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The results that were collected in lab #1 shows the relationship of surface areand volume in the artificial cells to the diffusion rate using the phenolphthalein-NaOH agar and the HCl solution. Lab #2 was a model of diffusion and osmosis‚ in which we filled the model cells with different solutions and determined the rate of diffusion. In lab #3‚ the results demonstrated the interactions between selectively permeable membranes‚ water‚ and solutes and how they are important in cellular and organismal
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A Raisin in the sun by Lorraine Hansberry thematically represents the life of the Younger family‚ the conflict of their dreams and their struggle to attain these dreams either for selfishness of the individual or because of family differences. Hughes symbolically represents the idea of dreams deferred in her poem and such is a direct resemblance to the different dreams of the characters‚ Mama‚ Beneatha‚ Walter Lee and Ruth and the effect that their dreams begin to have on the family and them as individuals
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Digital Balance used to measure the mass of the potato strip before and after osmosis. Time should be kept constant when the potato strip is put into the solution Hypothesis: The mass of the potato strip will increase in water and dilute concentrations of sucrose depending on the concentration within the cell. When the concentration of the sucrose solution outside the cells of the potato strip will be less‚ the mass of the solution will increase as water molecules from outside will diffuse into
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Introduction The reason of this experiment was to identify the properties and effects of osmosis. Osmosis can be defined as the diffusion of water through a selectively permeable membrane. (Miller/Levine) Osmosis occurs when there is an area of higher and lower concentration. Osmosis is a type of diffusion. Diffusion is when molecules move from an area of higher concentration to an area of higher concentration. The three types of concentrations are hypotonic‚ hypertonic‚ and isotonic. When in comparison
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SEMANTICS What is semantics? According to Fromkin et al. (2007)‚ semantics refers to "the study of the linguistic meaning of morphemes‚ words‚ phrases‚ and sentences." Timyam (2010) further describes the term as "the study of meaning [or the analysis of meaning]; it is mainly concerned with the meanings of words and sentences‚ the meaning relationships‚ and the conceptual system underlying meaning. Subfields of semantics include lexical semantics‚ which involves the meanings at lexical level and
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In Loraine Hansberry’s play‚ A Raisin in the Sun‚ the characters’ have a dream of their own‚ which get in the way of the other characters’ dreams. These dreams divide the characters’‚ which create problems between them. The root of each of their dreams is through a ten-thousand dollar check. The dreams of three characters’‚ Walter‚ Beneatha‚ and Mama Younger‚ create conflict with one another that make their dreams hard to achieve. Mama Younger‚ the mother of Walter and Beneatha Younger‚ devoted
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Osmosis in Potato Tubers Andrew Dickson Background When a plant cell is bathed in a solution of the same concentration (isotonic) as its intracellular environment‚ its mass and volume remain the same. This is because water enters and leaves the cells at the same rate. There is no net loss or gain of water by osmosis. Samples of cells can be placed in a range of solutions of different concentration. The cells will gain water by osmosis when placed in solutions which are more dilute (hypotonic)
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