ΔT1 = Kfm where Kf is a constant that depends on the specific solvent and m is the molality of the molecules or ions solute. Table 1 gives data for several common solvents. Table 1. Molal Freezing Point and Boiling Point Constants | Solvent | Formula | Freezing Point (°C) | Kf(°C/molal) | Boiling Point (°C) | Kb(°C/molal) | Water | H2O | 0.0 | 1.86 | 100.0 | 0.51 | Acetic acid | CH3COOH | 17.0 | 3.90 | 118.1 | 3.07 | Benzene | C6H6 | 5.5 | 4.90 | 80.2 | 2.53 | Chloroform | CHCl3 | –63
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Stage 2 Chemistry Investigation Folio: Practical – Galvanic Cell Name: YY Names of Partner: ZZ Part A Investigation Design Proposal: Purpose of Experiment: To determine the effect of concentration of reactants on the current produced by a galvanic cell. Hypothesis: The greater the concentration of solution in the two half cells reacting with the two metals to produce current‚ the greater the flow of current will be produced from the galvanic cell. Independent Variable: Concentration
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In the article “Sea Salt Around the World is Contaminated by Plastic” researchers discover that microplastics in sea salt from around the US‚ Europe‚ and China. This also proves that plastic pollution is pervasive in the environment. Research proved that tiny plastic particles have been found in our sea salt. This is dangerous because it means that microplastics are entering our daily food chain through the salts in our diets. Scientist believe that most of the contamination comes from water
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Hello’ I have chosen " Salt " short story by male writer‚ I picked this story because I think I have read this before‚ but it wasn’t the same I read before even they have the same name. The story starts with the death of Luis‚ who worked as obituaries editor in newspaper‚ by breast cancer. She wanted the eighteen summer intern boy to write her obituary‚ even he wasn’t a friend of her. He wrote that "Lois Andrews‚ age 45‚ of Spokane‚ died Friday‚ August 24‚ 1985‚ at Sacred Heart Hospital. There will
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Introduction Chemistry: Chemistry is the science of matter‚ especially its chemical reactions‚ but also its composition‚ structure and properties. [pic] Daily Life: All the things that happen or that you do regularly. Chemistry in Daily Life: Chemistry is a big part of our everyday life. We find chemistry in daily life in the foods we eat‚ the air we breathe‚ our soap‚ our emotions and literally every object we can see or touch. Here’s a look at some everyday chemistry. [pic] Actually‚ we found
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An Essay About Obesity How Metabolic Rate Changes With Caloric Intake The processing of food is a choreographed dance between the hormones and peptides of appetite and satiation; brain and digestive organs‚ and the neural communication pathways that conduct the messages between the two. Essentially‚ there are two phases of metabolic activity: Hunger (defined as “the internal impulse for food seeking”) and satiation (defined as “the feeling of fullness or satiation”) (Breedlove‚ Watson & Rosenzweig
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Environmental Chemistry: Water testing in Bouregreg Valley Nowadays we are more and more concerned of environmental issues and especially the ones about water since experts have remarked that wetland regions are disappearing (50% reduction). Wetland regions are very important because they help preserve different wildlife species and also can be considered important indicators of the health of the “blue planet”. One of the most interesting wetland regions is the Bouregreg one that is close to
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Introduction: This project is one of the most famous electricity projects that can be performed successfully by most students in the age of 10 to 16. It helps students to learn about producing electrical energy using chemical energy. Since the same method is used to get energy from many fruits and chemicals‚ this project has many names. Following are some of the other names or titles for this project: |Fruit power or fruit battery
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1. Prepare the salt‚ sugar‚ sand‚ and measuring teaspoon. 2. Once the ice cubes are set up in their bowls‚ quickly add the substances to the ice cubes so that they don’t melt before adding the substances. 3. Place three ice cubes quickly into each of the four bowls. 4. Arrange the ice cubes so that only the corners are touching‚ forming a triangular shape. 5. Carefully sprinkle ½ teaspoon (tsp.) of salt over the ice cubes in one bowl. 6. Sprinkle ½ tsp. of sugar over the ice cubes in another bowl
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CHEMISTRY PROJECT INVESTIGATORY PROJECT ON: CAFFINE CONTENT OF TEA About caffeine: Caffeine is a naturally-occurring stimulant‚ found in several plants. Caffeine is water soluble‚ and is extracted into the brewed cup when preparing tea‚ coffee‚ or other caffeinated drinks. The most well-known plants containing caffeine are the tea plant‚ Camellia sinensis‚ coffee‚ yerba maté‚ and guayusa. Although tea is known to have a number of health benefits‚ heavy caffeine use is known to have unpleasant
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