Al2O3 5. (5 points) Which element‚ indicated by letter on the periodic table below‚ has a 2+ ion with electron configuration [Ar]3d10 ? (a) A (b) B (c) C (d) D Exam #2 Page 1 6. (5 points) Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0. Which statement best describes the bonding in A3B? (a) The AB bond is largely covalent with a d– charge on A. (b) The AB bond is largely covalent with a d+ charge on A. (c) The AB bond is largely ionic with A as
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A) change easily from a liquid to gaseous form B) ionic C) hydrophobic D) polar E) have a low surface tension 5. The tendency of an atom to pull electrons toward itself is referred to as its _____. A) electronegativity B) covalency C) ionic potential D) polarity E) tonicity 6. In this molecule‚ what type of bond is found between the oxygen and hydrogen atoms? A) polar covalent B) hydrophobic C) ionic D) hydrophilic
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Discussion no. 2 The Nomenclature of Inorganic Compounds Discussion no. 3 The Periodic Table of Elements Sta. Maria‚ Yza Suaco‚ Trisha Marie T. Teves‚ Joan Marie Vale‚ Kate IN-9 Group 9 I. Introduction Representing molecules as images allows us to impart a great deal of information concerning molecular structure. But these molecules can also be named‚ and there are occasions when this is more convenient than drawing a picture. In the early days of chemistry‚ the list of known compounds
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Chemistry: A Molecular Approach (Tro) Chapter 9 Chemical Bonding I: Lewis Theory 1) Which of the following represent the Lewis structure for N? A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: A 2) Which of the following represent the Lewis structure for Cl? A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: B 3) Which of the following represent
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Practice Exam Chapter 8 I have put the questions we may not get to for this exam at the end of the practice exam) 1. How many lone pairs of electrons are assigned to the sulfur atom in H2S? a) 0 b) 1 c) 2 d) 3 e) 4 2. Which of the following is a correct Lewis structure for nitrous acid‚ HNO2? 3. The central atom in PH3 is surrounded by a) three single bonds and no lone pairs of electrons. b) three single bonds and one lone pair of electrons. c) three single bonds and two lone
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15.2 Born-Haber Cycle Our calculations of enthalpies so far have involved covalent substances. Now we need to look at the enthalpy changes involved in the formation of giant ionic lattices. Lattice enthalpy is defined as either the: ’the enthalpy change that occurs when one mole of a solid ionic crystal is broken into its ions in the gaseous state‚ at standard temperature and pressure. Because all the bonds in the ionic lattice are broken‚ it is an endothermic process‚ ∆H is positive. ’ The
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There exists four types of intermolecular bonding‚ they include ionic‚ covalent‚ Van der waals and hydrogen bonding. In order to describe the existence of such bonding you must also understand the concepts of polarity‚ polar and non-polar‚ and electronegativity. Ionic bonds are created by the complete transfer of electrons from one atom to another. In this process of electron transfer‚ each atom becomes a ion that is isoelectronic with the nearest noble gas.‚ the substance is held together by electrostatic
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1. Polar molecules A. have bonds with an unequal distribution of electric charge. B. must form ions in water solution. C. have bonds with an equal distribution of electrical charge. D. have bonds with an overall negative charge. E. have bonds with an overall positive charge. Correct See Section 2.2: How Do Atoms Bond to Form Molecules? Points Earned: 1/1 Correct Answer: A Your Response: A 2. Hydrocarbons are _______ and _______‚ whereas salts are _______ and _______. A. nonpolar;
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Title: Reaction of Iodoethane with Sodium Saccharin- Ambient Nucleophile Dates Performed: February 21 + 28‚ 2013 Date Submitted: March 14‚ 2013 Abstract: The product ratio of N-ethylsaccharin to O-ethylsaccharin that occurred due to alkylation with iodoethane at 80 oC was determined to be 81.5% to 18.5%‚ respectively‚ based on an analysis of the 1H NMR spectrum that was collected. The melting point range of 87.8-94.7 oC also indicated that the mixture was largely composed of N-ethylsaccharin
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The Biological Structure of Water Water is a substance with the chemical formula H2O: one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Its structure enables it to carry out many important functions in the body. Water molecules are charged‚ with the oxygen atom being slightly negative and the hydrogen atoms being slightly positive. These opposite charges attract each other‚ forming hydrogen bonds. These are weak‚ long distance bonds that are very common and
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