freezing point of pure water‚ the experimental van’t Hoff factor for a substance and the molar mass of an unknown solution. Reagents: 25mL deionized Water ¼ to ½ inches of rock salt 25mL Sodium Nitrate (NaNO3 ) 25mL unknown solution – handle unknown solution carefully Procedure: For part 1‚ the freezing point of deionized water was determined. An ice bath was prepared by filling a 600mL beaker ¾ full of ice and covered with ¼ to ½ inches of rock salt. The ice-salt mixture was stirred
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Water is an essential ingredient for life as well as a key element for our environment. The pollution of water has a great impact on all living things. According to James Roth‚ the US‚ 40% of rivers‚ lakes‚ and coastal waters are so contaminated that they are unfit for humans to fish in‚ swim in‚ or drink. As stated by the Natural Resources Defense Council (NRDC)‚ it is estimated each year that seven million Americans become sick from contaminated tap water‚ some cases being lethal. There
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Marisela Andrade The Effects of Salt Water on Gummy Bears Facilitated diffusion depends on passive transport. Molecules cross cell membrane by diffusion. A type of diffusion is osmosis. If no energy is input into the system during diffusion‚ the molecules will reach a state of equilibrium. The purpose of this experiment was to study why the death occurred among those who drank salt water. Two blue gummy bears had a height of 2 centimeters each. The mass of these gummy bears together were
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Water Pollution When you think of problems in the world today‚ water pollution isn’t one that would normally come up. In fact it is one of the worst problems in the world today. Water pollution‚ by definition‚ is the contamination of streams‚ lakes‚ underground water‚ bays‚ or oceans by any substances harmful to living things. All living things contain it‚ live in it‚ and most need it to survive‚ so water pollution is a big problem‚ if not the biggest. If severe‚ the pollution can kill off
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San Antonio Water Solution Proposal Since the early years of the 1700’s‚ San Antonio water supply came from its fresh sources; such as‚ the Olmos Creek and from one of the most famous river in Texas‚ the San Antonio River. But in nowadays‚ new sources of fresh drinkable water had to be found or build‚ mainly because the rapid growth it’s population and San Antonio as a whole. At the present moment San Antonio gets its fresh water supply from eight different sorceries and one the most important
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FEASIBILITY OF TWO FRESH WATER SUPPLY TECHNIQUES IN SUDAN 1.0 INTRODUCTION Access to clean water is considered a basic human right and in many countries when sustainable development is considered‚ water is at the top of the list of priorities (Omer‚ 2008). The value of water is increasingly felt in areas such as Sudan‚ where precipitation is inadequate while temperatures are high resulting in dry or arid conditions (Food and Agriculture Organisation (FAO)‚ cited in USAID‚ 2010). Two-thirds
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to 1mL of 35 °C yeast on the level of respiration in the solution‚ as measured by the degree of colour change after 10 minutes. | Degree of colour change in yeast solution at 35 °C after 10 minutes | Concentration of NaF drops in the yeast solution (+/-1 drops) | Group 1 | Group 2 | | Trial 1 | Trial 2 | Trial 3 | Trial 4 | Trial 5 | Trial 1 | Trial 2 | Trial 3 | Trial 4 | Trial 5 | A=0 drops | 1 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | B=5 drops | 2 | 4 | 2 | 4 | 4 | 3 | 3 | 3 | 3 | 3 |
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mixed with water create a solution or not. Research/Prior knowledge: Substances dissolve best in hotter water. You can use a flashlight to help see if a mixture is a solution‚ a suspension‚ or colloid. A solution is a mixture that forms when substances dissolve and form a homogenous mixture. A suspension is a heterogeneous mixture that separates into layers over time. A colloid is a mixture that contains some particles that are intermediate in size between the small particles in a solution‚ and the
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growth was for water treated B.pumilus and the lowest mean root growth was the salt water treated control. Water treated V.paradoxus has a higher mean root growth compared with salt water‚ with a high margin of error. B.pumilus has the largest difference between root growth between water treated and salt water treated. (Table 1) Table 1: Individual results of Brassica mean root growth (mm). These were treated with Bacillus pumilus and Variovorax paradoxus under water and salt water (100mM‚ NaCl)
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2012-2013 Winter Break Homework Packet Prince George’s County Public Schools Reading/English Language Arts Grade 9 1 GRADE 9 WINTER BREAK READING HOMEWORK PACKET In Preparation for the Maryland High School Assessment‚ PSAT‚ and SAT DIRECTIONS: The enclosed activities are to be completed by your child during the Winter Break and he/she is encouraged to return it to his/her Reading/English Language Arts teacher upon return to school. Parents are encouraged to assist in the following ways:
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