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
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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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IGCSE Chemistry 2012 exam revision notes by Samuel Lees Contents: 1. The particulate nature of matter 2. Experimental techniques 2.1 Measurement 2.2 (a) Criteria of purity 2.2 (b) Methods of purification 3. Atoms‚ elements and compounds 4.1 Atomic structure and the Periodic Table 4.2 Bonding the structure of matter 3.2 (a) Ions and ionic bonds 3.2 (b) Molecules and covalent bonds 3.2 (c) Macromolecules 3.2 (d) Metallic bonding 3 Stoichiometry 4
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theoretical yield)/ theoretical x 100% = percent error Abs. (58.5 – 60)/ 60 x 100 = 2.5% Scheme of the Reaction (Exp.12a/12b): Analysis of Results: In this experiment‚ the compound diphenylacetylene was made by using potassium hydroxide to take the bromine off of the 1‚ 2-dibromo-1.2-diphenylethane. Pyridinium bromide perbromide was used rather than Br2 due to it being a volatile and highly corrosive substance. Calculate the theoretical yield which was 0.107g of diphenylacetylene. Calculate the percent
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was made by German chemist Johann Dobereiner. In 1817 Dobereiner noticed that certain elements that were chemically similar could be grouped together in threes‚ for example‚ calcium‚ strontium‚ and barium; lithium‚ sodium‚ and potassium; chlorine‚ bromine‚ and iodine. In each group of three‚ the atomic weight of one element fell halfway between the atomic weights of the other two elements. Based on his discoveries‚ Dobereiner proposed the Law of Triads in 1829. His work made other scientists want to
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