Section A Multiple choice (17 marks) Do NOT Write on this section of the paper. Answer ALL questions in the table provided at the start of Section B Question 1. Which of the following best describes the structure of metals? A lattice of A. alternating positive and negative ions B. positive ions surrounded by freely moving electrons C. molecules held together by covalent bonds D. atoms held together by covalent bonds Question 2. Which of the following is not a property of most metals
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N11/4/CHEMI/SP2/ENG/TZ0/XX 88116105 CHEMISTRY STandaRd lEvEl PaPER 2 Monday 7 November 2011 (afternoon) 1 hour 15 minutes INSTRUCTIONS TO CANDIDATES • • • • • Candidate session number 0 0 Examination code 8 8 1 1 – 6 1 0 5 Write your session number in the boxes above. Do not open this examination paper until instructed to do so. Section A: answer all questions. Section B: answer one question. Write your answers in the boxes provided. 19 pages © International Baccalaureate Organization
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atmospheric condition i.e.‚ moist air‚ carbon dioxide form undesirable compounds on the surface is known as corrosion‚ The compounds formed are usually oxides . Rusting is also a type of corrosion but the term is restricted to iron or products made from it .Iron is easily prone to rusting making its surface rough. Chemically‚ rust is a hydrated ferric oxide. Titanic‘s bow exhibiting microbial corrosion damage in the form of ‘rusticles’ Rusting an Electrochemical Mechanism ; Rusting may be explained
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Nitrous oxide Nitrous oxide Description Nitrous oxide — an odorless‚ tasteless gas — is an inhalation analgesia that can be used during labor. You administer the anesthetic gas using a hand-held face mask. Nitrous oxide takes effect within a minute. While common in the United Kingdom and Canada‚ this technique is rarely used in the United States. Pros Nitrous oxide alters pain perception. It can be used intermittently or continuously during labor. If you need to have a tear repaired after delivery
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the facilities being required and conductive conditions for my project. Introduction The commercial production of aluminium began only in the last decade of the nineteenth century‚ although the existence of the metal in certain kinds of ores was known by scientists from the beginning of that century. However‚ until World War II greatly increased the demand for aluminium‚ little attention was paid to the deposits of bauxite outside Europe and the United States of America‚ including Jamaica
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Module 06 - EASA Questions 1. The property of a metal to resist deformation when subjected to a tensile load and is proportional to the maximum stress required to cause fracture: a. Tenacity. b. Toughness. c. Tensile strength. 2. The ability of a metal to resist wear and penetration is defined as: a. Hardness. b. Toughness. c. Bearing strength. 3. What is the strain of a 1.2m tube which as extended 15mm? a. 0.0125. b. 0.0125Nm-2. A Load (N) B C D Extension (m) c
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ore‚ and • Purification of the metal. It is also called ‘Refining’. Stages of extraction of metals: After the concentration of the ore is done‚ there are two main steps or stages in extractive metallurgy. They are: Conversion of the ore into Metal oxide or metal compound. Extraction of crude metal from metal from metal compound. Concentration of ores: Removal of the unwanted materials (e.g.‚ sand‚ clays‚ etc.) from the ore is known as concentration‚ dressing or benefaction. It involves several steps
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atmospheric condition i.e.‚ moist air‚ carbon dioxide form undesirable compounds on the surface is known as corrosion‚ The compounds formed are usually oxides . Rusting is also a type of corrosion but the term is restricted to iron or products made from it .Iron is easily prone to rusting making its surface rough. Chemically‚ rust is a hydrated ferric oxide Titanic‘s bow exhibiting microbial corrosion damage in the form of ‘rusticles’ Rusting an Electrochemical Mechanism ; Rusting may be explained by an
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3.0 INTRODUCTION Recently‚ University Putra Malaysia (UPM) have involved in a project that focuses on the environmental awareness. This project is called “Bandar Hijau Serdeng”‚ collaboration between UPM with the Subang Jaya Municipal Council (MPSJ0 which involved in activities from simple “3R’’ proses which includes reduce‚ recycle and reused campaigns. Extension to this project‚ UPM has decided to build a pavilion for the purpose of providing a place to sit and enjoy the scenery of Serdang town
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the group. Reactivity with oxygen Magnesium metal + oxygen gas magnesium oxide Mg (s) + O2 (g) MgO (s) unbalanced 2Mg (s) + O2 (g) 2MgO (s) balanced Calcium metal + oxygen gas calcium oxide Ca (s) + O2 (g) CaO (s) unbalanced 2Ca (s) + O2 (g) 2CaO (s) balanced Barium metal + oxygen gas barium oxide Ba (s) + O2 (g) BaO (s) unbalanced 2Ba
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