Experiment 2: IDENTIFICATION OF UNKNOWNS BY TLC AND MP IN COMBINATION Introduction: Thin layer chromatography (TLC) is one of the most valuable techniques in organic chemistry. This is a best method of separating and identifying mixtures of two or more compounds. The separation is accomplished by the distribution of the mixture between two phases: one that is stationary and one that is moving or mobile. Chromatography works on the principle that different compounds will have different
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Pressure to Abuse Drugs Among many forms of peer pressure imposed upon teens‚ pressure to abuse drugs may be the most prevalent in society. In fact‚ peer pressure has been found to be among thestrongest influences of drug use during adolescence.[1] One may feel that if they abuse drugs‚ they will automatically be accepted by their peers. Teens might tell themselves they will only try a drug once‚ but many find themselves under continual peer pressure to continue to experiment with drugs and ‘join
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temperature on cell membranes Independent variable: Temperature of beetroot Dependent variable: Absorbency of light Hypothesis: As temperature rises to its optimum temperature‚ the absorbency of light will increase because protein is an enzyme and will therefore be affected by temperature. This is because more beetroot dye will pass through the cell membrane and then into the distilled water. The deeper the colour of the beetroot dye‚ the higher the absorbency of light. Beetroot vacuoles have red
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Membrane Functions: Aim: To demonstrate the process of osmosis using a chicken’s egg Hypothesis: I predict that the egg’s mass after 10 min. in the 5% salt solution would increase due to and balancing out the solution. In the 10% salt solution‚ the egg’s mass would decrease since there is a high amount of salt. In the dilute water solution‚ the egg’s mass will increase‚ as the membrane would take in that water. Materials: 1- One fresh egg 2- One plastic spoon 3- One plastic fork
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Harmful Effects of Peer Pressure Peer pressure is found and seen every where from real life such as the school hallways or campus to movies‚ TV‚ and books. All teenagers experience peer pressure throughout their years as being a teen and often even after. The pressure caused by peers can be many different things including underage drinking‚ smoking‚ sexual intercourse and who they hang out with. "Internationally‚ as well as here in the UK‚ the concept of ’peer pressure ’ is widely used in analyzing
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Title: The effect on temperature on beet cell membranes. Introduction A cell membrane or plasma membrane is very important in protecting cells. A cell membrane is a thin layer that protects the cells. The membrane is filled with lipids and proteins. The cell membrane protects the cell from ions and molecules that enter and exit the cells. I hypothesize that at -5 degrees Celsius‚ the color intensity will be a 1. I hypothesize that at 5 degrees Celsius‚ the color intensity will be a 2
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Diffusion through a Membrane Introduction Molecules are constantly moving. They move in straight lines unless they are deflected by other molecules or obstacles in their environment. Diffusion is the process by which the collisions between molecules cause them to continually spread apart from each other. Their movement can be described as movement from an area of greater concentration to an area of lower concentration. Diffusion continues until the molecules are equally distributed
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MOVEMENT ACROSS MEMBRANES Intracellular fluid Extracellular fluid Pond water Blood plasma K+ A- ClNa+ Cl+ K+ Na+ Cl- Na+ Na+ Gill epithelial cell Intestinal epithelial cells Cl- Cell membrane Anionic proteins (a) Ion concentration inside a single animal cell (b) Ion concentration across gill epithelium of a freshwater fish Blood capillary Intestinal lumen Glucose from meal Cross section of small intestine (c) Glucose transport across intestinal epithelium into
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Peer pressure has been an issue in our society for many years. Adults‚ teens and even children are being subject to all kinds of outside influences to act and be a certain way‚ and to do certain things. Peer pressure is caused be the need to belong‚ ignorance and fear‚ and also the embarrassment of rejection. Teens‚ reaching for a bottle of alcohol at a party though they normally wouldn’t drink; this is an example of the need we all feel to belong. This is the "everyone else is doing it‚ it can’t
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* CONCLUSION ----------------------------------------------------------- 8 * REFERENCE ----------------------------------------------------------- 9 TITLE Osmotic pressure within red blood cell. INTRODUCTION Osmosis is a passive movement of water molecules going across the partially permeable membrane. It is a very spontaneous process due to the downhill energy flow known as “water potential” by which‚ water molecules move from a region of higher water potential to a region of
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