Question

Problem 1. Label each of the following items as an ionic compound. molecule: (a) LiCI (b) H2O (c) NaF element, or : (a) Problem 2. Label each of the following items as an ionic compound. molecule: (a) CO2: (b) CaO; (c) N2. Ans: (a) Problem 3. Write the ion symbol for an atom with the given number of protons and electrons: (a) 11 protons and 10 electrons; (b) 35 protons and 36 electrons; (c) 7 pro- tons and 10 electrons. Problem 4. Use the group number to determine the charge of the ion derived by each element. (a) Beryllium; (b) Oxygen; (c) Aluminum. Example: Ca".cr : (a) Problem 5. Which noble gas has the same electronic configuration as each of the following ions: (a) Na': (b) Cr; (c) Sr Problem 6. Horse shoe crabs utilize a copper containing protein called hemocyanine to transport oxygen. When O2 binds to the protein, Cu is oxidized to Cu2 and blood becomes blue in color. How many protons and electrons does each of these copper cations contain? ■ Cu+ contains一一protons and electrons. Cu contains protons and electrons. Problem 7. Which pair of elements will form jonic compound: (a) B and Br: (b) K and F: (c) Na and Mg; (d) Ca and O. Give the answer with Yes or No. Ans: (a) Problem 8. Zinc oxide, an ionic compound, formed from Zn and O2, is a common component of sunblocks. The zinc oxide crystals reflect sunlight away from the skin, and in this way, protect it from sun exposure. What is the formula unit of zinc oxide? Problem 9. Give the symbol for each ion: (a) Stannic ion; (b) lodide ion: (c) Manga- nese(II)ion. : (a)

Answer 1

a) Li Cl rightarrow Ionic b) H_2 O rightarrow Molecule c) Na F rightarrow Ionic a) CO_2 rightarrow Molecule b) Ca O rightarrow Ionic c) N_2 rightarrow Molecule a) 11 protons 10 electrons rightarrow Na^+ b) 35 protons 36 electrons rightdoublearrow Br^- c) 7 protons 10 electrons rightdoublearrow N^-3 1 mole H_2 O = 18 g 1 molecule = 18 times 1/NA = 18/6.022 times 10^23 = 2.98 times 10^-23 g a) Beryllium rightarrow Be^+ 2 b) Oxygen rightarrow O^-2 c) Aluminium rightarrow Al^+ 3 a) Na^+ rightarrow Neon b) Cl^- rightarrow Argon c) Ir^+ e rightarrow Krypton \r\n Cu^+ rightarrow 29 protons, 28 electrons Cu^+ 2 rightarrow 29 protons, 27 electrons a) B and Br rightarrow B Br_3 covalent No b) K and F rightarrow KF Ionic rightarrow Yes c) Na and Mg rightarrow No bond rightarrow No d) Ca and O rightarrow Ca O Ionic rightarrow Yes Zn O a) stannic Ion-Sn^+ 4 b) Iodide Ion rightarrow I^- c) Manganese (II) ion rightarrow Mn^+ e