Ba h. 7.1 Ions 27. What is a valence electron? * 28. To which group in the periodic table does each of the following elements belong? How many valence electrons do atoms of each element have? a. nitrogen d. barium b. lithium e. bromine c. phosphorus f. carbon 37. Name each ion in Problem 36. Identify each as an anion or a cation. 7.2 Ionic Bonds and Ionic Compounds 38. Define an ionic bond. 39. Explain why ionic compounds are electrically 29. Write electron dot structures
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Fe Co Ni Cu Zn Ga Ge As Se Br Kr potassium calcium scandium titanium vanadium chromium manganese iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine krypton 39.10 40.08 44.96 47.87 50.94 52.00 54.94 55.85 58.93 58.69 63.55 65.38(2) 69.72 72.63 74.92 78.96(3) 79.90 83.80 37 38 39 40 41 42 43 44 45 46 47
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carbon has a molar mass of 12.01 grams per mole.There are a few exceptions to this rule. In some cases‚ the element is usually found in a different form than just one unbonded atom. In the case of hydrogen‚ nitrogen‚ oxygen‚ fluorine‚ chlorine‚ bromine‚ and iodine‚ the element is diatomic‚ meaning that each molecule of the element has two atoms of that element stuck together. As a result‚ the formula of hydrogen is H2‚ nitrogen is N2‚ etc.This gets weirder for a couple of cases... phosphorus is normally
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Melissa Kenney Dr. Braun/Lab K Lewis Symbols & Structures Purpose The purpose of this lab experiment is to practice writing Lewis symbols for elements and monatomic ions while writing Lewis structure for molecules and polyatomic ions. I will also be writing chemical equations using Lewis structures for
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Operation Theatre Preparation Worksheet Name : LI Cheuk Chee Jasmine SID: 13003633 Cohort: NY 2013 Cluster / Hospital NTEC/ AHNH Instruction Student should answer all questions in point forms with reference. Students are required to submit the worksheet via TUNITIN TWO days in advance of corresponding specialty duty. There will be disciplinary action if any plagiarism found. Late submission may have disciplinary action. Format Guidelines: Font Arial Font Size 12 size Line
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Objectives After studying this Unit‚ you will be able to • name haloalkanes and haloarenes according to the IUPAC system of nomenclature from their given structures; • describe the reactions involved in the preparation of haloalkanes and haloarenes and understand various reactions that they undergo; • correlate the structures of haloalkanes and haloarenes with various types of reactions; • use stereochemistry as a tool for understanding the reaction mechanism; • appreciate the applications of organo-metallic
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FIRST PERIODICAL EXAM GRADE 7 NAME: SCORE: YEAR AND SECTION: DATE: I. MULTIPLE CHOICE. Circle the letter of the correct answer. 1. What is the set of procedures that can be used to explain and predict events or phenomena? A. Scientific discovery B. Scientific method C. Scientific notation D. Scientific thinking 2. Which of the following pairs of elements make up the salt compound? A. chlorine and oxygen B. oxygen and hydrogen C. sodium and chlorine D. sodium and hydrogen 3. What
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Electrolysis a) Electrolysis is the decomposition of a substance to give simpler substances. The substance being electrolysed has to be an ionic compound. b) The substance being decomposed is called the electrolyte. c) In electrolysis the electric current enters and leaves the electrolyte by conducting rods called electrodes. The positive electrode is called the anode and the negative electrode is called the cathode. d) For electrolysis to occur the electrolyte must be in liquid form so that
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solution? (A: 1.5g) 12. Vinegar is a solution of acetic acid. What is the molarity of the solution produced when 125g of acetic acid (C2H4O2) is dissolved in sufficient water to prepare 1.50 L of solution? (A: 1.39M) 13. How many grams of bromine‚ Br2‚ are needed to prepare 0.500 L of a 0.0100M solution in water?
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ROLE OF YOUTH IN OZONE LAYER PROTECTION Ozone layer plays a vital role in protecting animals‚ human beings and plants from ultraviolet radiation. Ozone layer is destroyed by a group of manufactured or human made chemicals such as chlorine bromine. These chemicals are called "ozone-depleting substances". Ozone layer is destroyed by some natural’s ways and some humane made activities. A single molecule of chlorine can break apart thousands of molecules of ozone. Chlorofluorocarbons the most widely
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