Explain why SmCl2, EuCl2 and YbCl2 are crystalline salts with no colors whereas LaCl2, CeCl2 and PrCl2 have a metallic appearance and great electricity conduction.
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Explain why SmCl2, EuCl2 and YbCl2 are crystalline salts with no colors whereas LaCl2, CeCl2 and PrCl2 have a metallic appearance and great electricity conduction.
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- PbF4 has a melting point of 600 °C, whereas PbCl4 melts at 215 °C. Please provide a justificationfor this observation.Calculate the lattice energy of AgBr(s) using the following thermodynamic data (all data is in kJ/mol). Ag(s) ΔHsublimation = 265 kJ/mol Ag(g) Ionization energy = 711 kJ/mol Br-Br(g) Bond energy = 173 kJ/mol Br(g) Electron affinity = -345 kJ/mol AgBr(s) ΔH°f = -120 kJ/mol ______________ kJ/molVF5 is a liquid that boils at 48°C, whereas VF3 is a solid that melts above 800°C. Explain this difference in properties.
- 122 CHAPTER 5ID 15. Which of the following best describes the particle-level bonding in a crystal of KBr? iupil doiw (A) alternating positive and negative metal ions in a crystal lattice framework. (B) positive and negative ions in fixed position in a crystal lattice framework. (C) mobile valence electrons shared between positive metal ions. (D) metallic and nonmetallic atoms covalently bonded in a 3-dimenional framework. () HO (C) CC (D) CH'OE Questions 16-17 use the following information. 6801 9010 oloegsini doidW8 H H H---H H H Ethane wolod a (B) но-с-Сн, — СH, — СH, — СH, ннн нннн H-C-C- C-C-C-C-C-H || | | I|| Η Η Η Η | H. нн Heptane Pentanoic Acid 10 Name Chemical Formula Molar Mass (g/mole) Boiling Point (°C) Ethane 30.07 -88.5 Heptane 16 100.20 98.1-98.7 Pentanoic Acid 102.13 186-187 16. Heptane and pentanoic acid have very similar molar masses, but pentanoic acid has a significantly higher boiling point. Which of the following statements best helps explain this observation? (A)…hydrated CuSO4 is blue in colour. why?The thermal decomposition of 1.826 g of a hydrate of MnCl2 produces 1.161 g of anhydrous MnCl2. Calculate the mass percent of water in the hydrate.
- Consider the equilibrium, CO2(g) + H2(g) < ---- > CO(g) + H2O(g). Calculate the equilibrium concentration of CO, given that the equilibrium constant, Kc, is 0.0049 and the equilibrium concentrations of H2O(g) is 0.46 M, that of H2(g) is 4.54 M, and that of CO2(g) is 9.54 M. Group of answer choices 0.46 M 10. M 0.098 M 2.2 MGive the molecular formula for any stable molecules that contain one atom of the specified elements, and chlorine as the only other element. Lead: Carbon: If more than one compound is possible, name the phenomenon responsible, and state what it involves. no 1023603/39 What is the fundamental cause of this phenomenon? Comment on how this affects oxidation states and the trend in ionization energies down the group.Using the thermodynamic tables find the enthalpy of formation for H2O (l). a. – 1.29 x 103 kJ/mol b. – 5.16 x 103 kJ/mol c. – 1219.471 kJ/mol d. none of these e. – 187.8 kJ/mol f. + 314.42 kJ/mol g. – 285.840 kJ/mol h. – 241.826 kJ/mol
- There is a trimeric silicate ion Si3O96-. Draw a possible structure for the ion. Phosphorus forms an isostructural and isoelectronic ion. What is its formula? Another element forms an isoelectronic and isostructural neutral compound. What is its formula?sketch a diagram showing the formation of energy levels from the valence orbitals for Li, Li2, Li3, Li(n). On the diagram, place arrows indicating how the electrons fill these energy levels How many energy levels are present in the valence band of a single crystal of lithium with a mass of 348.3 mg?What mass of silver oxide, Ag2I, is required to produce 25g of silver sulfadiazine, AgC10H9N4SO2, from the reaction of silver oxide snd sulfadiazine?