CHEMISTRY PROJECT WORK SESSION -2013-2014 ROLL NO- CLASS-XII ‘A’ SUBMITTED BY SUBMITTED TO ROHIT LAKHERA Mrs. ANITA BISHT CERTIFICATE This is hereby to certify that‚ the original and genuine investigation work has been carried out to investigate about the subject matter and related data collection
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In the 18th and 19th centuries scientists wrestled with identifying and describing the nature of the “stuff” that produced change. One concept that became popular for a while was that of “caloric” (what we now call heat). “Caloric was originally conceived of as a quantity that would flow from a hotter object to a cooler one that would warm up as a result. It answered the need for a way for the cause of warming to get from here to there. Not only did caloric serve as a cause for warming‚ it
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Salt and the effect it has on water. Do you like salt? Do you put it on your food to make it taste better? Salt doesn’t just make food taste better; it can change the freezing and boiling point of water. I bet you didn’t know that! There’s a reason for that‚ but I’ll explain that a little later. First‚ let’s find out if salt can actually change the freezing and boiling point of water. To do so‚ we need to do an experiment. Now‚ if you’re going to do an experiment‚ you’re going to need a hypothesis
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Introduction: Oxidations are used in organic chemistry to perform certain tasks in a laboratory. Visualizing how an oxidation reaction works in organic chemistry is a bit more difficult to point out than in general chemistry. But the concept is still the same. The idea of an oxidation reaction is to decrease the electron density around a carbon. Essentially‚ it is the loss of an electron around a carbon. To identify if an oxidation has occurred in organic chemistry the following could happen: replace a
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lived a salt merchant. He had a monkey for his assistance. Every morning‚ he would load a sack of salt on the donkey and go to the nearby town to sell it. On the way‚ they had to walk across a pond. One day‚ while crossing the pond‚ the donkey thought‚”Ooh! This load is so heavy that I become exhausted very soon. I wish I could get some of this load taken off my back.” Just then the donkey tripped and fell into the water. Fortunately‚ the donkey was not hurt. But the sack of salt on the donkey’s
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Salt is made up of 40 percent sodium and 60 percent of chloride‚ is a very important part of daily lives as it helps maintain your blood’s water content‚ balances acids and bases in your blood‚ and it helps in the movement of electrical charges which are in your nerves throughout your muscles. A human being should consume about 2400 mg of salt daily. On average‚ humans tend to go over the recommended amount. The food industry adds 75 percent of the sodium that we humans consume. The following additives
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Gas Chromatography (GC) Definition: Gas chromatography is a physical method of separation in which the components to be separated are distributed between two phases‚ one being a stationary bed of large surface area‚ and the other a gas that percolates through the stationary bed. When the stationary phase is a solid‚ the separation process is more precisely called gas-solid chromatography. Introduction: Gas Chromatography is a technique widely used to separate complex mixtures of substances. Compounds
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atoms can rotate and vibrate with respect to each other. These vibrations and rotations also have discrete energy levels‚ which can be considered as being packed on top of each electronic level. UV/Vis spectroscopy is routinely used in analytical chemistry for thequantitative determination of different analytes‚ such as transition metal ions‚ highly conjugated organic compounds‚ and biological macromolecules. Spectroscopic analysis is commonly carried out in solutions but solids and gases may also
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12U Equilibrium Unit Test Multiple Choice K/U Identify the letter of the choice that best completes the statement or answers the question. ____ 1. When solid lead(II) phosphate is in equilibrium with its ions‚ the ratio of lead(II) ions to phosphate ions is which of the following? a. 1:1 d. 2:3 b. 1:2 e. 3:2 c. 2:1 ____ 2. In a saturated solution of silver phosphate‚ the concentration of silver ion is 4.5 10-4 mol/L. The Ksp of silver phosphate would be which of the following
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Mahatma Gandhi proposed a non-violent march protesting the British Salt Tax‚ continuing Gandhi’s pleas for civil disobedience. The Salt Tax essentially made it illegal to sell or produce salt‚ allowing a complete British monopoly. Since salt is necessary in everyone’s daily diet‚ everyone in India was affected. The Salt Tax made it illegal for workers to freely collect their own salt from the coasts of India‚ making them buy salt they couldn’t really afford. Return to "India under British
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