Chemical Prperties of Metals Most metals are chemically reactive‚ reacting with oxygen in the air to form oxides over changing timescales (for example iron rusts over years and potassium burns in seconds). The alkali metals react quickest followed by the alkaline earth metals‚ found in the leftmost two groups of the periodic table. Examples: 4Na + O2 → 2Na2O (sodium oxide) 2Ca + O2 → 2CaO (calcium oxide) 4Al + 3O2 → 2Al2O3 (aluminium oxide) The transition metals take much longer to
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Special Report Plastic Additive: A Techno-Commercial Profile B.G. SAMPAT E-mail: bgsampat@bom3.vsnl.net.in INTRODUCTION Every activity in modern life is influenced by plastics and many depend entirely on plastic products. All these plastic products are made from the essential polymer mixed with a complex blend of materials known collectively as additives. Without additives‚ plastics would not work‚ but with them they can be made safer‚ cleaner‚ tougher and more colourful. Additives cost money
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Plastic Composition and Types of Plastic A plastic is made up principally of a binder together with plasticizers‚ fillers‚ pigments‚ and other additives. The binder gives a plastic its main characteristics and usually its name. Thus‚ polyvinyl chloride is both the name of a binder and the name of a plastic into which it is made. Binders may be natural materials‚ e.g.‚ cellulose derivatives‚ casein‚ or milk protein‚ but are more commonly synthetic resins. In either case‚ the binder materials consist
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Part III PHYSICS HSE II Time:2Hours Max:60 Scores 1. Three identical charges each +q are placed at the corners of an equilateral triangle of side d cm. Calculate the force on a +ive charge +2q at the centroid of the triangle. 2 2.If the earth is supposed to be a metallic sphere‚its capacity will be nearly (a) 700pf (b) 700 microfarad (c) 700f (d) 6.4 X10^6 f 1score 3. write the relation between dielectric constant and electric susceptibility. 1score 4. A box encloses an electric dipole consisting
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Chemical elements listed by electro negativity This list contains the 118 elements of chemistry. The chemical elements of the periodic chart sorted by: | Electro- negativity | Name chemical element | Symbol | Atomic number | - Name alphabetically | 0.7 | Actinium | Ac | 89 | - Atomic number | 0.79 | Lanthanum | La | 57 | - Symbol | 0.82 | Potassium | K | 19 | - Atomic Mass | 0.82 | Strontium | Sr | 38 | - Electro negativity | 0.89 | Cerium | Ce | 58 | - Density | 0.89 | Thorium |
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Green technology is not just something of the present; it has history and is going to play a big role in the future. “The term ‘technology’ refers to the application of knowledge for practical purposes.” (http://www.green-technology.org‚ 2010) With that being said‚ green technology is a method of products designed to protect our environment from toxins. We are living in the age of technology‚ but we are not living in the environmentally “cleanest” era. In the 21st century we need to look into the
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using 30%. We as consumers need to make sure which companies really use recycling bottles so they do not end up in landfills. According to the Ban the Bottle website‚ plastic bottles contain a chemical that causes depression and dizziness called antimony‚ large doses of this chemical can lead to death. Tannenbaum‚ Kiri Feb. 13 2012.The Drinking Water Inspectors stated that tap water is as good as
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Name___________________________________________ Chem 111 Practice Exam 1 Summer 2014 (60 points) MULTIPLE CHOICE. Choose the answer that best completes the statement or answers the question. 1) Round off 807509 to four significant figures. a. 8076 b. 00 81 c. 8100 d. 8.075 × 105 2) Convert 5.100 × 10-3 to ordinary notation. a. 5100 b. 0.0005100 c. 510.0 d. 0.005100 3) To the correct number of significant figures‚ an automobile traveling at 28
Free Atom Periodic table Chemical element
Atomic number | Element | Percent of Mass[2][3][4][5] | Mass (kg)[6] | Atomic percent | Positive health role in mammals[7] | Group | 8 | Oxygen | 65 | 43 | 24 | Yes (water‚ electron acceptor) /No (Reactive Oxygen Species) | 16 | 6 | Carbon | 18 | 16 | 12 | Yes (organic compounds are hydrocarbon derivatives) | 14 | 1 | Hydrogen | 10 | 7 | 63 | Yes (e.g. water) | 1 | 7 | Nitrogen | 3 | 1.8 | 0.58 | Yes (e.g. DNA and amino acids) | 15 | 20 | Calcium | 1.4 | 1.0 | 0.24 | Yes (e.g. Calmodulin and Hydroxylapatite inbones)
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an antimony in kelsen’s ptl Some important ideas in K’s PTL can be traced back to Kantian trad K draws distinction btn 2 radically dif worlds: world of facts & world of norms. The normativity of legal science and idea of validity as a binding force‚ based on doctrine of the BN These tenets & use of a normative concept of validity prove to be incompatible w/ K’s positivistic programme of a value-free legal science. Science of law CANNOT state that legal norms are obligatory or binding w/o overstepping
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