object again it will do the same thing until it can get past the object. 2. Describe the mechanism of movement in Paramecium based on fluxes of calcium in cilia. When the calcium channels open up and allow the influx of calcium ions into the cell‚ the increase the calcium ions causes the reversal of the cilia and the paramecium starts to swim backwards. 3. How do paramecia react to each cation solution? Did you noticed differences in direction‚ duration or frequency of their movement? Explain the
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Figure 1: Schematic illustration of the principle of Biacore SPR to measure the interaction between analyte molecules in the flow with immobilized receptor binding sites on the surface. A) SPR uses an optical method to measure changes in the refractive index near the surface of a thin gold film on a glass slide. At a critical angle of incident light on the surface-solution interface an electromagnetic field or evanescent wave is generated. This is detected as absorption of light and a decrease in
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Flame Test Lab Question: When a compound is placed in the flame of a burner‚ what happens to the color of the flame? Hypothesis: When the compound is placed in the flame‚ the flame changes color depending on the chemical compound. When they’re heated‚ they gain energy and changed color sometimes. Safety Requirements for this Lab: Wear goggles at all times. If you want to remove them to write in your notebook you may sit at a table in the center of the room. When you sit down remove them
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thus indicating living cells. However‚ if it stays blue it doesn’t mean that the cell is dead - the enzymes could be inactive/denatured. Methylene blue can inhibit the respiration of the yeast as it picks up hydrogen ions made during the process. The yeast cell cannot then use those ions to release
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of calcium. If a person consumes 0.06 g of calcium‚ how many moles of calcium did he consume? 1.5x10-3 mol What is the empirical formula of a compound that contains 20% calcium and 80% bromine by mass? CaBR2 Calculate the number of hydroxide ions present in 0.250 mol of Ca(OH)2. 3.01x1023 |What is the volume occupied by 0.25 moles of Nitrogen at STP? | | | 5
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Describe the difference between a mixture and a compound. A compound is a substance in which atoms of different elements are chemically held to one another. A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components‚ a compound cannot. Below are some examples of the differences between each. Compounds •Compounds are pure substances. •They are made up of two or more
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When you mix copper‚ silver‚ and nitrate together‚ you will end up with silver nitrate solution will turn blue (it has become copper nitrate). On the piece of copper‚ there would be a coating of solid silver. If a chemical reaction is going to be observed when chemicals are mixed‚ heated or any other means of altering the substance‚ then we will be able to predict the products formed. If it is observed that in the original versus the changed substance no new substances are formed‚ the change is reversible
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Name: __________________________________ Teacher: ________________________________ DO NOT OPEN THE EXAMINATION PAPER UNTIL YOU ARE TOLD BY THE SUPERVISOR TO BEGIN Chemistry 2202 FINAL EXAMINATION June 2010 Value: 100% General Instructions This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I – Multiple Choice (40%) Select the letter of the correct response from those provided. EITHER
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three examples of percent compositions determined to help narrow the selection of possible unknowns. Titrations using Na2S2O3 and HCl to determine percent cobalt and ammonia‚ respectively‚ are used. Silver nitrate is used to precipitate the chloride ions in the unknown‚ which can be measured to determine the percent composition of chloride in the unknown. The results from these three major analyses helped to draw the conclusion that the unknown is in fact [Co(NH3)6]Cl3. -2.0 Synthesis/Analysis of
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“WATER IS A GOOD SOLVENT” Water is very unique in all facets of its nature. The chemical formula for water is H2O as a water molecule consists of two atoms of the chemical element hydrogen (H) and one atom of the element oxygen (O). Water is the most abundant chemical compound on earth as its mass all exists together‚ naturally‚ in its gaseous‚ liquid and solid state. It is the most precious natural resource to man and is essential to life for all discovered living organisms. One of the unusual
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