Plants Introduction In this lab experiment‚ we set out to examine the different transpiration rates of a plant system in certain environments. Water is transported in a plant by the process of transpiration‚ which is the loss of water through evaporation from the surface of leaves. The stomata in leaves are responsible for the diffusion of water vapor. Transpiration brings water upward through the xylem in the plant. There are certain factors that can affect transpiration rates in plants. Most
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Data and Conclusions: The purpose of this experiment was to learn how to use distillation and gas chromatography to separate and identify different compounds from a given mixture. There are several kinds of distillation methods. However‚ the method that we used in this experiment was fractional distillation. This method is used when trying to separate two different volatile compounds whose boiling points differ by 40-50°C or more. If the boiling points are too close‚ this method
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or solid state of matter to convert into gas state. Liquid Gas (Vaporization) Solids Vapor state (Sublimation) This can be observed in the process of evaporation that clouds are made of pure distilled water and that’s why rain water is so pure. Moreover the process of distillation can be performed in a laboratory. All elements have a property known as vapor pressure. The vapor pressure is a critical concept
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supply‚ and optimum temperature cause stomata to open and increase transpiration. Its exact significance is disputed; its roles in providing the energy to transport water in the plant and in aiding dissipation of the sun ’s heat (by cooling through evaporation of water) have been challenged. Since stomatal openings are necessary for the exchange of gases‚ transpiration has been considered by some to be merely an unavoidable phenomenon that accompanies the real functions of the stomata. ("Transpiration")
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seperating volatile product from impurities‚ or to separate two or more volatile compounds with adequate difference in boiling points ` When liquid is placed in container‚ some of the molecules evaporate into unoccupied space inside the container. Evaporation continues until there is equilibrium between the molecules leaving and entering the liquid. The pressure exerted by these gaseous molecules on the walls of the container is the equilibrium vapor pressure. The magnitude of this pressure depends on
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biscuits and instant noodle should be 0.95‚ 0.352-0.35‚ 0.30 and 0.342-0.497. 3.2 Drying Oven Drying oven is a common method used to calculate the moisture content in food products and the principle used in oven drying method is through the evaporation of water by the hot air in the oven. Thus‚ when a sample is placed inside the oven‚ water molecules in the sample will be evaporated and the moisture content can then be determined by the difference between it initial weight and dried weight. However
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Lab# 3 – Simple and Fractional Distillation Written by: Theressa Payne Partner: Jennifer Jantzi Performed: February 4‚2013 for CHEM 7005 John Birtwell February 6‚ 2013 Lab # 3 – Simple and Fractional Distillation Introduction: One of the most important tasks in chemistry is the separation of organic compounds which are not usually found in pure form naturally or as products of chemical synthesis. Distillation is a common method for purifying liquids based upon their boiling
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Data 4) | 1.041g | 1.030 g | 6. Percent Water in unknown(Data 5 / Data 3) X 100 | 50.024 % | 51.449 % | 7. Percent Error | 2.297 % | .486 % | Observations – Trial 1: The hydrate is bubbling and some of it is melting and becoming a liquid. Evaporation is occurring and the melted part is hardening to form a consistent solid. The sample is sticking together instead of being in separate granules. The sample has dried up and is becoming crusty. Trial 2: The observations of trial 1 are the same as
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substances are heated to a boiling point in a glass container known as the pot. A condenser that is cooled by flowing water is used to cool the vapors produced as they re-liquefy and are collected in a separate container known as the receiver. Evaporation is a type of vaporization of a liquid which occurs at temperatures below the boiling point that take place from the surface of a liquid‚ into a gaseous stage of only the molecules on the liquid surface. Equilibrium vapor pressure is obtained once
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Experiment #1 Title: Physical and chemical changes‚ and measurements in the metric system Name: Goh Kian Shen Lecturer: Dr. Anne Kee Hooi Ling Section: Chemistry 107A Date lab was performed: 17 January 2013 Aim: The aim of the experiment is to understand physical and chemical changes of
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