occurs for: -complex structures -rapid cooling "Amorphous" = Noncrystalline noncrystalline SiO2 Adapted from Fig. 3.22(b)‚ Callister 7e. Chapter 3- 3 METALLIC CRYSTALS • tend to be densely packed. • have several reasons for dense packing: -Typically‚ only one element is present‚ so all atomic radii are the same. -Metallic bonding is not directional. -Nearest neighbor distances tend to be small in order to lower bond energy. • have the simplest crystal structures. We will look at
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What’s in a “Chemical”? Jordan Butt and Alexandra Porter Bleach Table of Contents HOUSEHOLD CHEMICAL – Bleach * Page 4 : Product Use * Page 5 : Chemical Ingredients * Page 6 : Associated Symbols * Page 7 : Suggested Precautions * Page 8 : Possible Health Effects * Page 9 : Possible Environmental Effects * Page 10 : Disposal recommendations CHEMICAL COMPOUND – Sodium Hypochlorite * Page 12 : The Basics * Page 13 : Chemical Properties * Page 14 : Physical Properties
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2NaN 3 (s) → 2Na (s) + 3N 2 (g) Two students looked at data in a simulated computer-based experiment to determine the volume of nitrogen generated in an airbag. (a) Sodium azide involves ionic bonding‚ and metallic bonding is present in sodium. Describe ionic and metallic bonding. [2] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Vanessa Gale Formal Lab: Evaluation of the Gas Law Constant Dr. Monzyk Due 06/25/2012 Purpose: The purpose of this lab is to evaluate the gas law constant. The ideal gas law is represented as PV=nRT‚ where R represents the gas law constant. To determine R‚ we must find the other parameters‚ P‚ V‚ n and T through the experiment. Equipment and Materials: Large beaker Ring stand Clamp Copper wire 100 mL eudiometer tube Magnesium (Mg) ribbon M6 H2SO4 (Sulfuric Acid) Wash bottle
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Solutions manual: Chapter 1 Getting started © Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2006. This page from the Chemistry Dimensions 1‚ Teacher’s Resource may be reproduced for classroom use. QUESTIONS 1 Research 2 Property Solid Liquid Gas Volume Fixed Fixed Variable Shape Fixed Variable Variable Forces between particles Yes Yes No Movement of particles Vibration and rotation Vibration‚ rotation and translation Random and chaotic
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relative change of electrical resistance divided to mechanical strain (relative change of the length of the conductor). Commercial strain gauges are made with metallic and semiconducting sensing elements. SGF of metallic gauges is from 2 to 6‚ and for semiconducting ones it is from 40 to 200 in absolute value [15-17]. Piezoresistive effect in metallic conductors is concerned with change of geometry of them. In semiconductors the effect is concerned generally with change of specific resistance of them due
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H2 Chemistry 9647 Term 3 Block Test 2010 – Examiner’s report H2 CHEMISTRY 9647 Paper 2 (Section A) Structured Questions Question 1 – Atomic Structure and Redox Titration Most elements exist in nature as mixture of isotopes. At present‚ there are about 1600 known isotopes‚ of which only one-sixth are stable. The unstable isotopes lose energy by emitting ionising particles or radiation through the process of radioactive decay. Ernest Rutherford and later Paul Villard discovered the three
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Electron Configuration: [Ar]4s23d104p4 Oxidation States: 6‚ 4‚ -2 Selenium is a non metallic chemical element‚ member of the group XVI of the periodic table. In chemical activity and physical properties it resembles sulfur and tellurium. Selenium appears in a number of allotropic forms: the most popular are red amorphous powder‚ a red crystalline material‚ and a gray crystalline metallike form called metallic selenium. This last form conducts electricity better in the light than in the dark and
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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 all the time. Corrosion is a process that happens over a period of time when required properties within a material begin to deteriorate‚ after a long time exposure to oxygen within
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Lensey Ford Mrs.Beckwith Pre-Ap Physical Science 23 November 2015 Revolving with Electrons Have you ever wondered exactly how the elements on the periodic table are organized‚ what the groups on the periodic table mean‚ and how electrons work in an atom‚ compound‚ and chemical bond? The way elements are organized on a periodic table has to do with the characteristics that they hold. There are groups‚ periods‚ compound formation and color coordination in a periodic table. The periodic
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