tested the purity of water by looking for the chemicals free chlorine‚ chloride‚ sulfate‚ nitrate‚ copper‚ total hardness‚ iron‚ hydrogen sulfide‚ lead‚ pesticides‚ pH‚ total alkalinity‚ and total chlorine inside a water sample. The chemicals that produced a 0.0 result meant that there was no trace of that chemical inside the sample. The chemicals not found were copper‚ hydrogen sulfide‚ free chlorine‚ lead‚ iron‚ pesticide‚ and total chlorine. As a class we found the results of the other chemicals
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oxide = magnesium sulphate + water Sodium hydroxide is a corrosive metallic base‚ and it is also called caustic soda. Nowadays‚ it is made along with hydrogen and chlorine‚ using the chloralkali process (any process that produces chlorine or a related oxidizer ) Electrolysis of a solution of sodium chloride (common salt) makes chlorine and sodium hydroxide. 2NaCl + 2H2O --electric
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If the positive metal ions in the solutions are less powerful reducing agents‚ then the metal in the plate will be reduced and hence form a deposition of solid metal. e.g. Zn + Pb2+-> Zn2+ + Pb EXPERIMENT 2: Aim: To range the halogens bromine‚ chlorine and iodine‚ with the strongest oxidising agent first. Hypothesis: A strong oxidising agent is a species that easily gains electrons‚ and is hence easily reduced. The ionisation energy of the halogens (Cl2‚ I2‚ Br2) decreases down the group‚ which
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…………………………………………………………….. Year 12 80% A 70% B AS Level Chemistry 60% C 2008 – 2009 50% D 40% E Below U Questions on % Haloalkanes 2.8 32 1. Chloromethane can be prepared by a reaction between methane and chlorine in the presence of ultraviolet radiation. (i) Outline the mechanism for this reaction. ..................................................................................................................................... .....................
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Fireworks! Have you ever been to an aerial fireworks show at an amusement park‚ baseball game‚ Fourth of July celebration‚ or on New Year’s Eve and wondered about how all the impressive colors and sounds are produced? People everywhere enjoy the fantastic explosions and the brilliant light displays of fireworks. However‚ these spectacles are much more than just a form of entertainment. Each firework launched into the sky is a precisely formed assembly of chemicals and fuel‚ carefully calibrated
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organisms like bacteria‚ virus‚ yeast‚ spores and fungus. Even in swimming pools‚ calcium hypochlorite proves to be a very efficient disinfectant. It is normally available in tablet form or a simple white powder which is highly stable than normally used chlorine. Such a kind of cleaning process is known as “pool shock.” Simple three step process for disinfecting
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Guess Paper – 2009 Class – X Subject – Chemistry (P- Block Elements) Kalra sir 09460472649 kalra1977@rediffmail.com Group 15 elements: |Symbol |Atomic |Electronic configuration | | |number | | | |7 |[He]2s22p3 | |N | | | |P |15 |[Ne] 3s23p3 | |As |33 |[Ar]3d104s24p3
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hexane will be added to the test tube mix. Observations of both layers will be recorded. Process repeated for bromine. For the third solubility test‚ 1mL of hexane will be added to a clean test tube. Then‚ 0.5mL of Clorox and 0.5M HCl (to make chlorine) are added. The color of each layer is noted. Part III: Electronegativity Testing This set of reactions will look at all possible combinations of two reactants‚ adding each
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Precipitation Titration Mohr Method Experimental The chloride ion (Cl-) is an important anion found in solids and solutions. In this experiment‚ the amount of chloride ion in an unknown sample J (NaCl + KCl mixture) of water using the Mohr method is determined‚ which relies on the solubility differences of two anions and the titration endpoint of a precipitate. The net ionic reaction during the titration is as follows: Ag+ + Cl- → AgCl(s) The Ksp for AgCl is 1.8 x 10-10 and
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white/yellow precipitate formed cloudy yellow precipitate formed REACTION W/ NH4OH does not dissolve; precipitate becomes defined does not dissolve; precipitate becomes defined does not dissolve TABLE 2: REACTION OF HALOGENS WITH HEXANE AND CHLORINE WATER REACTION NAF NABR KI COLOR OF THE TOP LAYER clear yellow pink IS THIS HALOGEN MORE OR LESS ACTIVE THAN CL? more less less TABLE 3: REACTION OF UNKOWN HALOGEN D WITH CA(NO3)2 AND AGNO3 REACTION USED TO TEST THE UNKNOWN
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