Periodic Table: * Mass Number = protons + neutrons in the nucleus * Atomic Number = number of protons in the nucleus * Number of neutrons = mass number – atomic number Example: Lithium (Li) * # of protons + # of neutrons = mass # * 3 + 4 = 6.9/ 7 * The atomic mass is the mean of all the isotopes of Lithium in nature; round the number * Isotopes of a specific element have a varying number of neutrons * The number
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Study material CHEMISTRY CLASS: XII KENDRIYA VIDYALAYA SANGATHAN LUCKNOW R E G I O N 2009-2010 Study Material Class XII -Chemistry SHRI RANGLAL JAMUDA IAS‚COMMISSIONER CHIEF Patron KENDRIYA VIDYALAYA SANGTHAN NEW DEHLI SHRI M.S Chauhan Asst. Commissioner Patron Kendriya Vidyalaya Sangthan Lucknow Region SHRI S.S. Rawat Guidance Smt. A.N Siddiqui (Education officer) (Education officer) SHrI K.‚M. Bhatnagar (Education officer) Co-ordinator SHRI. T. Singh Principal K.V. No. 2
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CH 125 INORGANIC CHEMISTRY FOR MICROBIOLOGY Laboratory Manual 2013 Edition By Brian Clark‚ Marco Castillo & Patrick Chan CENTENNIAL COLLEGE OF APPLIED ARTS & TECHNOLOGY‚ SCARBOROUGH‚ ONTARIO Preliminary Laboratory Information - CH 125 The following safety information is provided to the student in order to ensure that all students and college staff working in the laboratory are aware of common industrial laboratory safety practices. Laboratory
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Inorganic compounds exclude compounds exclude compounds based on carbon. The vast majority of chemical compounds are organic. S.No | Name of the chemical compound | Formula | 1 | Acetic acid formula | CH3COOH | 2 | Hydrochloric acid formula | HCl | 3 | Sulfuric acid formula | H2SO4 | 4 | Acetate formula | CH3COO- | 5 | Ammonia formula | NH3 | 6 | Nitric acid formula | HNO3 | 7 | Phosphoric acid formula | H3PO4 | 8 | Sodium phosphate formula | Na3PO4 | 9 | Calcium carbonate formula
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(Anions) + Positive Ions (Cations) = Solubility of Compounds in water Example any anion + Alkali Ions (Li+‚ Na+‚ K+‚ Rb+‚ Cs+‚ Fr+) = soluble Sodium fluoride‚ NaF‚ is soluble any anion + hydrogen ion [H+ (aq)] = soluble hydrogen chloride‚ HCl‚ is soluble any anion + ammonium ion (NH4) = soluble ammonium chloride‚ NH4Cl‚ is soluble nitrate NO3- + any cation = soluble potassium nitrate‚ KNO3‚ is soluble acetate (CH3COO-) + any cation (except Ag) = soluble sodium acetate‚ CH3COONa‚ is
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CHEMISTRY TRIAL 2011 MARKING SCHEME PAPER 2 4541/2 http://cikguadura.wordpress.com © Trial2011 Hak Cipta Sekolah Berasrama Penuh SULIT SULIT 2 MARKING SCHEME FOR CHEMISTRY PAPER 2 4541/2 No. 1. (a) (i) (ii) Answer Zinc Mark 1 1 1 1 1 1 1. The presence of X/zinc atoms disrupts the orderly arrangements of copper atoms 2. This reduce the layers of atoms from sliding over one another easily Steel Silicon dioxide/silica /sand Heat resistant/can withstand with high temperature (iii) (b)(i)
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increase or decrease in concentration. ("a" is done as an example.) a) Mg(s) + 2HCl(aq) H2(g) + MgCl2(aq) reaction rate = mass of Mg consumed unit time b) c) or reaction rate = volume of H2 produced unit time or reaction rate = decrease in [HCl] unit time or reaction rate = increase in [MgCl2] unit time AgNO3(aq) + NaCl(aq) C(s) + O2(g) 1 NaNO3(aq) + AgCl(s) CO2(g) 2. For each of the following reactions find a quantity or property which could be monitored in order to measure the rate
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gas along with respective salt when they react with a metal. Example:- Hydrogen gas and zinc chloride are formed when hydrochloric acid reacts with zinc metal. Hydrogen gas and sodium chloride are formed when hydrochloric acid reacts with sodium metal. Hydrogen gas and iron chloride are formed when hydrochloric acid reacts with iron. Hydrogen gas and zinc sulphate are formed when zinc metal reacts with sulphuric acid Test for hydrogen gas: The gas evolved after reaction of
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C12H22O11 molten sulphur S limewater Ca(OH)2 ammonia solution NH3 aqueous ethanonoic acid CH3COOH aqueous sulphurous acid H2SO3 aqueous carbonic acid H2CO3 aqueous sulphuric acid H2SO4 aquous nitric acid HNO3 aquous hydrochloric acid HCl aqueous potassium hydroxide KOH aqueous sodium hydroxide NAOH copper(II) sulphate solution CuSO4 Electrolysis of Molten Compounds Molten/aqueous ionic
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SAFETY General WHMIS beforehand – no messing around on anything‚ no food/drink anywhere PPE – goggles‚ coat‚ feet Treatment Skin Chem: emergency shower – TA/HS Eye Chem: eye wash – 10 mins. TA/HS Fire Emergency kill switch for gas‚ electricity and water – leave and set the alarm Stop drop and roll Apparati should be clear of any controls or switches‚ keep vapours to minimum/take need Extinguishers – on the wall inside each 1st year lab Class A - ordinary combustibles
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