Chem 21 Fall 2009 Experiment 9 — Recrystallization _____________________________________________________________________________ Pre-lab preparation. (1) Read the supplemental material from Zubrick‚ The Organic Chem Lab Survival Manual. (2) Draw the structure of acetanilide and report relevant physical data. Be sure to cite the source of the data. You should be able to figure out what’s relevant by reading the procedure. (3) Find and report the boiling points of the solvents you will be using
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3. Why don’t the terms depolarization and action potential mean the same thing? The terms depolarization and action potential differ because are excitable cells that communicate by transmitting electrical impulses that are capable of producing rapid electrical signals and depolarization in the interior surface of the membrane which becomes less negative and the exterior surface becomes less positive. Additionally‚ when depolarization reaches a certain threshold‚ an action potential is initiated
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The ‘Experiment’ by Dr Haskell portrays the unusual experiment that he conducted to compare his bare body and a Chickadees body in harsh freezing conditions. He decided to investigate it further because there was no logical explanation for a tiny bird to be able to survive in such conditions. He related his astonishment to the Bergmann’s rule‚ which states that larger animals will be found in colder climates and smaller animals will be found in warmer climates. Haskell found that the Chickadees
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Length of Balloon (0.1cm) Trial: Time: Seconds (0.1cm) 30 1 2.0 30 2 2.1 30 3 1.9 30 4 2.2 30 5 1.8 mean: 2.0 Displacement (meters and centimeters) (1) Work (0.1) Power (0.1) 11 m‚ 18 cm 559 279.5 11 m‚ 32 cm 566 269.5 10 m‚ 33 cm 516.5 271.8 11 m‚ 32 cm 566 257.3 10 m‚ 32 cm 516 286.7 10 m‚ 89.4 cm 544.7 273.0 Veloctiy (m/s) Displacement/Time Acceleration (m/s/s) Velocity/Time Trial 1 11.18/2.0 = 5.59 5.59/2.0 = 2.80 Trial 2 11.32/2.1 = 5.39 5.39/2.1 = 2.57 Trial 3 10.33/1.9 = 5.43 5.43/1
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Abstract An experiment is conducted to prepare soap and thus‚ to compare the properties of the prepared soap and synthetic detergents which are precipitation‚ emulsification and cleaning abilities. It can be concluded that soap has the properties if emulsifying oil whereas detergent has not. The abilities of forming precipitates can be seen clearly in soap solution whereas detergent forms no precipitates at all. The experiment is completed and successfully conducted. Introduction
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Photosynthesis Experiment Introduction Photosynthesis is a process used by plants‚ making inorganic molecules into organic molecules (food) using sunlight. Carbon dioxide + Water (mainly from rain) Glucose + Oxygen From this process‚ carbon dioxide comes from environment. Glucose‚ as a product is used to make energy for growth. Lastly‚ the oxygen is a waste product in this chemical reaction‚ which become part of the Earth’s atmosphere. At this experiment‚ carbon dioxide and water
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Seth Dennison and Jenna Snyder John Bryan Psychology of Gender 104 10/31/2012 Psychological Gender Experiment For our psychological gender experiment we chose to focus on the topic of memory differences between genders. At first we wanted to figure out if one gender had a better memory than the other‚ but then we also wanted to observe whether or not their memory showed better results when the objects were related to their gender. Therefore‚ the hypothesis we constructed was: If
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The wheelchair experiment introduced me to a world that I have never known. I have never been in a wheelchair or been affected by any form of hearing‚ visual‚ or physical disabilities. So‚ this experiment caused me to really think about how the layout of a space‚ weight of doors‚ etc. could affect someone. While using the wheelchair‚ I felt as if I was in the spotlight every time I entered a room or crossed paths with a group of individuals. People would look on as I posed in the wheelchair and give
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Should we use animals for experiments? (against) The question is‚what it means to use animals for experiments? It means‚ the investigators and doctors whose are producing medicines they have to test is first‚somehow‚to see how is the effect of the medicine.This “somehow” means the animals.Moreover I haven’t said anything about testing new products like cosmetic products‚make-ups‚sprays. In my opinion‚the animals are different‚they body and organism are different.For this reason the scientists
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The purpose of this experiment was to test the tonicity of potato cells. The potato cells were placed in different test tubes with water and were left there for 15 minutes. The percent change in mass is then used to determine if the cells lost or gained water‚ therefore determining the tonicity of the cell. Although it was a brief 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
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