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- Using the standard enthalpy of formation data in Appendix G, calculate the bond energy of the carbon-sulfur double bond in CS2.Think of forming an ionic compound as three steps (this is a simplification, as with all models): (I) removing an electron from the metal; (2) adding an electron to the nonmetal; and (3) allowing the metal cation and nonmetal anion to come together. a. What is the sign of the energy change for each of these three processes? b. In general, what is the sign of the sum of the first two processes? Use examples to support your answer. c. What must be the sign of the sum of the three process d. Given your answer to part c, why do ionic bonds occur? e. Given your above explanations, why is NaCl stable but not Na2Cl? NaCl2? What about MgO compared to MgO2? Mg2O?Describe the molecular structure around the indicated atom or atoms: (a) the sulfur atom in sulfuric acid, H2SO4[(HO)2SO2] (b) the chlorine atom in chloric acid, HClO3[HOClO2] (c) the oxygen atom in hydrogen peroxide, HNO3[HONO2] (d) the nitrogen atom in nitric acid, HNO3[HONO2] (e) the oxygen atom in the OH group in nitric acid, HNO3[HONO2] (f) the central oxygen atom in the ozone molecule, O3 (g) each of the carbon atoms in propyne, CH3CCH (h) the carbon atom in Freon, CCl2F2 (i) each of the carbon atoms in aliene, H2CCH2
- For the following pairs of ions, use the principleof electrical neutrality to predict the formula ofthe binary compound that the ions are mostlikely to form.a. N a and S2 e. C u2 and B rb. K and C lf. A l3 and Ic. B a2 and O2 g. A l3 and O2d. M g2 and S e2 h. C a2 and N3c. A number of concatenated sulfur forms are known, such as S6, S7, and Ss, while similar compounds for oxygen are not known. Provide an explanation.Write the empirical formula for at least four ionic compounds that could be formed from the following ions: 2+ 4+ OH , Fe, MnO, Pb' L... ? X
- Part II: Binary Covalent Compounds Covalent compounds are produces by nonmetals bonding with one another. You can use the valence electrons for each element to determine the simplest formula that exists between two elements. For example, H has 1 valence electron and needs one more to obey the Octet Rule, so it will only make 1 bond when found in a compound. Oxygen has 6 valence electrons and needs two more to obey the Octet Rule, so it typically makes 2 bonds when found in a compound. Since hydrogen needs just one electron while oxygen needs two, the correct formula for the simplest compound would be H20. However, there are often other combinations possible in addition to the simplest formula. For example, hydrogen and oxygen can also form, H2O2, which is known as hydrogen peroxide. To work with all the possible combinations, some rules have been developed for naming binary covalent compounds. The rules are stated below: 1. The least metallic element will always end in the suffix…7 Which of the following elements will have the fastest chemical reaction? A. Na B. Al C. Si D. P 8 Which of the following elements will have the fastest chemical reaction? A. I B. Br C. Cl D. F Which of the following element's atoms will NOT have an octet of electrons when 9 the atom is ionized? A. Li B. Na C. K D. Rb 10 What is the octet rule? A. All atoms when they chemically react will have only 8 electrons after the reaction is completed. B. Most atoms when they chemically react will try to have 8 valence electrons after the reaction is completed. C. Most atoms when they chemically react will give 8 valence electrons to another atom. D. Most atoms when they chemically react will take 8 valence electrons from another atom. BLIVEWORKSHEETSConsidering the stable ions of the following compounds, which could be a possible combination of a metal and nonmetal? a. NaI2 b. Al2S3 c. MgBr d. CaF3
- Give a specific explanation for the observed differences in reactivity based on the atomic structure of the elements.Y For parts a to f, consider the loss of electrons by atoms of the element X, and a gain of electrons by atoms of the element Y, if X is in Group 2A (2), Period 3, and Y is in Group 7A (17), Period 3. a. Which reactant has higher electronegativity? b. What are the ionic charges of X and Y? c. Write the electron arrangements for the atoms of X and Y. d. Write the electron arrangements for the ions of X and Y. e. Give the names for the noble gases with the same electron arrangements as the X and Y ions. f. Write the formula and name for the ionic compound formed from X and Y. e. a) Y has the higher electronegativity b)1. Draw Lewis Structures (including resonance structures if applicable) for the following molecules/ions: A. NO3– B. NO2– C. NO2+ D. O3 2. Which of the following items in Number 1 are isoelectronic?
