BOILING POINT G1 Decreases going down. Because metal bonds get weaker. Less energy is required this metallic bonding. BOILING POINT G 17‚18 Increases. Because the atomic size incrases. The molecules are attracted by intermolecular forces. Going down the group‚ the intermolecular forces increases. More energy is needed to overcome these stronger forces. DENSITY Because mass increases faster than volume. REACTIVITY OF GROUP 1 The number of occupied shells increases. The atomic size increases
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despite their strength that still light that the traditional metallic materials. The polymers often used to make this composite material is epoxy‚ polyester‚ vinyl and even nylon. Thus in making CFRP carbon fibre is often combined with polymers such as epoxy to result in a material that has a very high strength-to-weight ratio. Carbon fibre reinforced polymers despite being relative expensive as compared to other traditional metallic materials; they have been preferred for many applications such
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should be submitted before the class (NO delay is allowed). • Make-up class will be scheduled with you‚ if necessary. UNIST 2011 Spring AME20201 Schedule Week 1-2 2-5 5-6 6-7 8 7‚10 10-11 12-13 14-15 16 Topic General Intro; Atomic Bonding Crystalline Structure; Imperfections Imperfections; Diffusion Mechanical Properties Midterm Exam Dislocation & Strengthening Mechanisms Failure & Phase Diagrams Electrical & Thermal Prop. Magnetic & Optical Prop. Final Exam Chapter 1‚2
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is a hybrid type of silicate and polycarboxylate cements. This adheres to the enamel‚ dentin‚ and metallic materials. They are supplied in 3 different types‚ type I‚ type II‚ and type III. Type I is for cementation of metal restorations and direct-bonded orthodontic brackets‚ while Type II is designed for restoring areas of erosion near the gingiva. And Type III is used as a liner dentin bonding agent. Glass ionomer has benefits such as it causes less trauma to the pulp; it has low solubility
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Syallubus for CHEM 1301 General Chemistry I Fall 2011 SCIE 2.106‚ M‚W: 2:35-3:50 Instructor Name: Dr. J. G. Parsons Email: parsonsjg@utpa.edu Office: Science room number: 3.348 Phone: Office : 381-7462 Office Hours: M/W: 1:30-2:30 or by appointment CRN: 12626 REQUIRED MATERIALS: Text Book: Chemistry by Julia Burdge (ISBN 978-0-07-302554-4) Scientific calculator (ARIS software package Required) RECOMMENDED MATERIALS: Burdge study guide Blackboard web course and a UTPA email address. CREDIT: Lecture
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bromide‚ the attraction between ions is strong/ ionic bond/PbBr2 has strong electrostatic attraction. ∴ it has higher a m.p. (Do NOT accept lead(II) bromide is an ionic compound/ ionic structure) 1 1 (ii) Lead is a metal/ The bonding between lead atoms in solid is metallic bond. There exists mobile/ delocalized (freely-moving) electrons in lead ∴ it conducts electricity. In solid lead(II) bromide‚ the ions are not mobile ∴ it does not conduct electricity 1 1 (iii) Yes‚ when molten/ in liquid
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SYLLABUS FOR ENTRANCE TEST 2012 UNIVERSITY OF HEALTH SCIENCES LAHORE‚ PAKISTAN STRUCTURE OF ENTRANCE TEST PAPER 2012 Sr.# Subject No. of Questions 1. PHYSICS 44 2. CHEMISTRY 58 3. ENGLISH 30 4. BIOLOGY 88 TOTAL 220 CONTENTS PHYSICS Syllabus TOS Self Test Questions CHEMISTRY Syllabus TOS Self Test Questions ENGLISH Syllabus Self Test Questions BIOLOGY Syllabus TOS Self Test Questions PAGE# 1-5 6 7-9 10-21 22 23-28 29-34 35-36 37-44 45 46-51 PHYSICS
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These are the oxides where the Period 3 elements are in their highest oxidation states. In these oxides‚ all the outer electrons in the Period 3 element are being involved in the bonding - from just the one with sodium‚ to all seven of chlorine’s outer electrons. The structures The trend in structure is from the metallic oxides containing giant structures of ions on the left of the period via a giant covalent oxide (silicon dioxide) in the middle to molecular oxides on the right. Melting and boiling
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CHEMISTRY 110 GENERAL CHEMISTRY I INFORMATION SHEET Fall 2011 Instructors: Professor Ashok Kakkar Otto Maass Chemistry Building‚ room 313 Tel: (514) 398-6912 Office hours: By appointment‚ e-mail via WebCT to arrange meetings. E-mail: use webCT Professor Scott Bohle Otto Maass Chemistry Building‚ room 233A Tel: (514) 398-7409 Office hours: By appointment‚ e-mail via WebCT to arrange meetings E-mail: use webCT Professor Bryan Sanctuary Otto Maass Chemistry Building‚ room 224 Tel: (514) 398-6930
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by phonon vibrations. Metals (e.g. copper‚ platinum‚ gold‚etc.) are usually good conductors of thermal energy. This is due to the way that metals are chemically bonded: metallic bonds (as opposed to covalent or ionic bonds) have free-moving electrons which are able to transfer thermal energy rapidly through the metal. The "electron fluid" of a conductive metallic solid conducts most of the heat flux through the solid. Phonon flux is still present‚ but carries less of the energy. Electrons also conduct electric current through
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