Exercise 14: Qualitative Anion Tests PURPOSE: The purpose of this experiment is to identify some commonly occurring anions & to study some of the reactions used for their identification. PROCEDURE: You must first determine to which of the three groups the various anions belong. Since no two people observe the same event in exactly the same way it is important to also conduct specific confirmation tests on the known samples of each anion. This information will help identify the anion
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million eggs during a single breeding season. The only natural control is a species of diving duck. Hot water will kill zebra mussels (only useful for a very small bilge!). Chlorine will also kill them‚ but is very toxic to marine life. Potassium‚ bromine‚ ozone and ultraviolet light are less toxic alternatives are difficult to apply under water. A novel experiment was reported at the Sixth International Zebra Mussel and other Aquatic Nuisance Species Conference in March 1996.zebra mussel’s are about
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Common Elements/Uses Element Common Uses &/or Descriptions Aluminum A light metal used in making airplanes‚ buildings‚ pots and pans‚ etc. Bromine Used in photography‚ medicines‚ insecticides‚ etc. Calcium A soft‚ metallic chemical element found in limestone‚ marble‚ chalk‚ etc. Carbon Found in coal‚ oil‚ gas‚ living things‚ and inks. Chlorine Used in bleach‚ in chemical to kill germs in swimming pools‚ and found with the element sodium in table salt. Chromium A shiny metal usde on bumpers
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amine groups‚ which are electron-donating. Chlorobenzene contains chlorine‚ which is electron-withdrawing. Phenol contains a hydroxyl group. Oxygen‚ being electronegative‚ was suspected to be electron-withdrawing and hence it took longer time for the bromine to react with benzene. Nitrophenol contains two substituents‚ one of which is a nitro group which is electron-withdrawing. 2.) Sources of error if actual and theoretical doesn’t agree. Contaminated chemical reagents Inappropriate proportions Uncontrolled
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Zinc and Hydrochloric-Acid Written By Kahlil Zione Date:02/02/05 Abstract: We observed the reaction between zinc and hydrochloric acid and recorded it in a table and learned wether the percentage of zinc is effected by the amounts of both substances added to the solution. Introduction The purpose of this experiment is to determine if the amount of zinc and hydrochloric acid will effect the percentage of the zinc in the out coming solution. We are reacting zinc metal with hydrochloric
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certain types of doze alarm-type alarm clocks.It can turn into liquid at room tempurature.It boils at 656.11 F. Mercury is the only metal that is a liquid at standard temperature and pressure. The only other liquid element under standard conditions is bromine‚although the metals rubidium‚ cesium‚ and gallium melt just warmer than room temperature. Mercury has a very high surface tension‚ so it forms rounded beads of liquid.
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methyl bromide and hydrochloroflourocarbons (HCFCs) are the major contributors to the deterioration of the ozone layer. These chemicals have industrial halocarbons that break up into chlorine and bromine in the upper stratosphere when they react with the sun’s rays. Chlorine eats up the ozone layer while bromine acts as a catalyst and speeds up the process. Often found in Antarctica‚ there are frozen chemical clouds in the upper stratosphere called polar stratospheric clouds. These polar stratospheric
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PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
Free Atom Electron Covalent bond
PHILIPPINES DATE SUBMITTED: 3 JANUARY 2012 DATE PERFORMED: 8 DECEMBER 2011 ------------------------------------------------- ABSTRACT Alkyl halides are molecules which have a carbon atom attached to a halogen atom (e.g.‚ chlorine‚ iodine‚ or bromine.) Alkyl halides are very important since they are used in many of the products used today. They can be synthesized by means of adding alcohols to hydrogen halides (such as HCl‚ HI‚ or HBr) resulting in nucleophilic substitution (specifically the SN1
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with alkyl halides and that these salts readily lose HX with strong base. This product is called an ylide or a phosphorane. The ylide is a polar molecule with a carbanionic carbon. Figure 1. How to make a phosphorus ylid (1) In relation to stereochemistry‚ such as cis/trans‚ or E/Z‚ is still not fully understood in the reaction (2). Triphenylphosphines tend normally to give the Z- (Cis)
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