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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- (a) (i) (ii) (iii) With the aid of a simple schematic, explain what covalent bonding is and how it is formed. What are the differences between a covalent bond and an ionic bond? Which type of bond is found in crystalline silicon? At room temperature do you expect an ionic crystal to be a good electrical conductor or a good electrical insulator? Explain why.Briefly explain (in one or two sentences) the following observations: a. TIH is stable but TIH3 is not. b. SiF4 reacts with water but CF4 does not. c. HCl can be formed from H₂ and Cl₂ but HI cannot be synthesized from H₂ and I2. SiH4 rapidly reacts with water to produce H₂ and SiO2, in a manner very similar to the reaction between SiCl4 and H₂O. a. Write balanced equation for the reaction between SiH4 and H₂O that produces SiO2 and H₂. b. Is this a redox or acid-base reaction? c. Draw a clear mechanism of the first step in the reaction showing clear structures of reactants, intermediates and the products.In some electrolyte drinks, MgCl2 is added to provide magnesium. Why would you expect MgCl2 to be soluble in water?
- Calculate the lattice energy of TICI(s), in kJ/mol, using the following thermodynamic data: Heat of sublimation 161 kJ/mol for TI lonization energy for TI 569 kJ/mol Cl-CI bond energy 223 kJ/mol Electron affinity -369 kJ/mol for CI Heat of formation for -224 kJ/mol TICIBH3 exist as a dimer, also known as diborane, while BF3 is monomeric. Explain?3. Calculate the radius of a tantalum atom, given that Ta has a BCC crystal structure, a density of 16.6 g/cm³, and an atomic weight of 180.9 g/mol.
- 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 MThere 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?