Table of content Introduction.............................................................................pg. 1 Definition of corrosion…………………………….....................pg.2 Chemical change during corrosion…………………………….pg.3 Corrosion in Metals………………………………………………pg.4 Preventing corrosion……………………………………………..pg.4 ABSTRACT Introduction Corrosion has been a fundamental problem from the time humans started using metals. Many metallic substances such as steels‚ cars and ships become subjects to corrosion
Premium Oxygen Iron Hydrogen
know: IONIC bonds: form betw. two atoms when electrons are transferred from one atom to the other. Occurs when the electronegativities of the two atoms are very different and one atom has a much stronger pull on the electrons than the other atom. One atom gains electrons and has an overall negative charge and the other atom loses electrons and has an overall positive charge – these atoms are ions and the attraction of their opposite charges constitutes the ionic bond. (EX: NaCl) COVALENT bonds:
Free Atom Electron Ion
kj/mol which of the following substances are largely ionic and which are covalent HF ENF = 4.0; ENH = 2.1: DEN = 1.9 HF is polar covalent. (b) HI ENI = 2.5; ENH = 2.1: DEN = 0.4 HI is polar covalent. (c) PdCl2 ENCl = 3.0; ENPd = 2.2: DEN = 0.8 PdCl2 is polar covalent. (d) BBr3 ENBr = 2.8; ENB = 2.0: DEN = 0.8 BBr3 is polar covalent. (e) NaOH Na+-OH- is ionic (f) CH3Li CH3Li is polar covalent. Use the electronegativity data in Figure 7.4 to
Premium Energy Electronegativity Atom
TUTORIAL 1: STK1503 BENZENE AND AROMATIC 1. Draw structures corresponding to the names given. a. m-fluoronitrobenzene b. p o-chlorophenol c. o-chlorophenol d. 3‚5-dimethylbenzoic acid e. 1-phenyl-3-methylpentane 2. Provide correct IUPAC names for each of the following compounds. a. NO2 CH3 b. c. CH3 d. NH2 H2N CH3 e. Ph C H3 C C CH2CH2CH3 Ph 3. For each molecule below‚ predict whether the molecule would be expected to show aromatic character or not. Explain your answer
Premium Oxygen Chemistry Atom
electrons and 6 neutrons. Carbon-14 has 6 protons‚ 6 electrons and 8 neutrons. 4a. What are two types of bonds that hold the atoms within a compound together? -Ionic and covalent bonds 4b. A potassium atom easily loses its one electron. What type of bond will it form with a chlorine atom? -An ionic bond Bottom line I learned about the different structures of atoms. Amanda Bynes 2.2 assessment p.5 pg. 44 October 2nd 1a. What does
Free Atom Chemical bond Hydrogen
| | Answers are attached Enjoy Biology‚ 8e (Campbell) Chapter 7 Membrane Structure and Function Multiple-Choice Questions 1) Who was/were the first to propose that cell membranes are phospholipid bilayers? A) H. Davson and J. Danielli B) I. Langmuir C) C. Overton D) S. Singer and G. Nicolson E) E. Gorter and F. Grendel 2) Who proposed that membranes are a phospholipid bilayer between two layers of hydrophilic proteins? A) H. Davson and J. Danielli B) I. Langmuir
Premium Atom Covalent bond Cell membrane
predominantly ionic compound and provide cyanide ion : C N in solution. The attack mainly takes place through lone pair of electron on carbon atom due to high electron density and not through nitrogen atom since C-C bond is more stable than C-N bond. AgCN: is mainly a covalent compound therefore‚ nitrogen donates electron pair forming isocyanide as the main product. 3. Grignard Reagent is prepared under anhydrous conditions. Ans. In Grignard Reagent‚ the carbon-magnesium covalent bond is highly
Premium Alcohol Carboxylic acid Oxygen
However in covalent bonds the nuclei are positive and the electrons which are being shared are negative. The intermolecular forces in hydrogen chloride are Dipole-Dipole forces: The slightly negative end of another hydrogen chloride particle will become attracted to the other end of the particle which has a slight positive charge. Therefore the two dipoles will become drawn together because the electrons are not shared between the two particles of hydrogen chloride. Dipole-Dipole bonding is less powerful
Premium Oxygen Water Atom
SYLLABUS Cambridge O Level Chemistry 5070 For examination in June and November 2014 University of Cambridge International Examinations retains the copyright on all its publications. Registered Centres are permitted to copy material from this booklet for their own internal use. However‚ we cannot give permission to Centres to photocopy any material that is acknowledged to a third party even for internal use within a Centre. © University of Cambridge International Examinations 2011 Contents
Premium Chemistry Oxygen Ionic bond
Module A Lesson 2: Famous Gemstones and Jewellery Diamond Encrustations British Crown Jewels Koh-I-Noor diamond: (“Mountain of Light”) One of world’s largest diamonds The Cullinan Diamond: largest diamond rough ever found Hope Diamond Deep blue colouration Lack of internal flaws Shows VS1 clarity First sold to King Louis XIV Top ten diamonds by size Diamonds >10 carats = exquisite Diamonds >50 carats = possession of museum/wealth people Diamond >199 carats = not sold
Premium Mineral Corundum Color