For Chapter 2 you MUST know: The names and symbols for elements 1-36 Know the polyatomic Ions. You MUST know ammonium (\(\ce{NH4+}\)), acetate ( \(\ce{CH_3COO^-}\)), carbonate ( \(\ce{CO_3^{2-}}\)), hydroxide ( \(\ce{OH^-}\)), nitrate ( \(\ce{NO_3^-}\)), phosphate ( \(\ce{PO_4^{3-}}\)), and sulfate ( \(\ce{SO_4^{2-}}\)). Turn in your answers for the following questions - show your work How many protons, neutrons and electrons are present in one atom of the following: 1 H 2 H 3 H 79 Br 81 Br 1 - 262 Bh What is the Atomic Weight of chlorine given that: The exact mass of 35 Cl is 34.9689 and the relative abundance is 75.53% The exact mass of 37 Cl is 36.9659 and the relative abundance is 24.47% Is this the answer that you expected? What is the Atomic Weight of ruthenium given the following information from WebElements, www.webelements.com. Is this the answer that you expected? Isotope Abundance Exact Mass 96 Ru 5.54% 95.907599 98 Ru 1.87% 97.905287 99 Ru 12.76% 98.9059389 100 Ru 12.60% 99.9042192 101 Ru 17.06% 100.9055819 102 Ru 31.55% 101.9043485 104 Ru 18.62% 103.905424 For the following molecules; write the chemical formula. carbon dioxide iron (II) chloride dinitrogen pentoxide iron (III) sulfate Name the following compounds. KI CaF 2 Cu 2 SO 4 N 2 O LiOH Give the chemical formula (or atomic symbol) and charge for the following ions: sulfate sulfite nitrate chloride nitride acetate carbonate The Following Questions are for your practice - Do Not Turn In. They include answers so you can check your work Atomic Structure and Symbolism Write the symbol for each of the following ions: the ion with a 1+ charge, atomic number 55, and mass number 133 the ion with atomic number 15, mass number 31, and a 3− charge Answer A 133 Cs + Answer B 31 P 3 − Give the number of protons, electrons, and neutrons in neutral atoms of each of the following isotopes: \(\ce{^7_3Li}\) \(\ce{^{125}_{52}Te}\) Answer A 3 protons, 3 electrons, 4 neutrons Answer B 52 protons, 52 electrons, 73 neutrons Chemical Formulas Write the molecular and empirical formulas of the following compounds: > Answer A molecular CO 2 , empirical CO 2 Answer B molecular C 2 H 2 , empirical CH The Periodic Table Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal: uranium bromine gold americium Answer A metal, inner transition metal Answer B nonmetal, representative element Answer C metal, transition metal Answer D metal, inner transition metal Molecular and Ionic Compounds Using the periodic table, predict whether the following chlorides are ionic or covalent: (a) KCl, (b) NCl 3 , (c) ICl, and (d) PCl 5 . Answer A ionic Answer B covalent Answer C covalent Answer D covalent Chemical Nomenclature Name the following compounds: CsCl BaO K 2 S Answer A cesium chloride Answer B barium oxide Answer C potassium sulfide Write the formulas of the following compounds: rubidium bromide magnesium selenide calcium chloride Answer A RbBr Answer B MgSe Answer C CaCl 2 Write the formulas of the following compounds chlorine dioxide dinitrogen tetraoxide potassium phosphide silver(I) sulfide Answer A ClO 2 Answer B N 2 O 4 Answer C K 3 P Answer D Ag 2 S Each of the following compounds contains a metal that can exhibit more than one ionic charge. Name these compounds: Cr 2 O 3 FeCl 2 CrO 3 Answer A chromium(III) oxide Answer B iron(II) chloride Answer C chromium(VI) oxide