Silicon carbide, SiC, has the three-dimensional structureshown in the figure.(a) Name another compound that has the same structure.(b) Would you expect the bonding in SiC to be predominantlyionic, metallic, or covalent? (c) How do the bondingand structure of SiC lead to its high thermal stability(to 2700 °C) and exceptional hardness?

Silicon carbide, SiC, has the three-dimensional structureshown in the figure.(a) Name another compound that has the same structure.(b) Would you expect the bonding in SiC to be predominantlyionic, metallic, or covalent? (c) How do the bondingand structure of SiC lead to its high thermal stability(to 2700 °C) and exceptional hardness?

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter20: Chemistry Of Hydrogen, Elements In Group 3a Through 6a, And The Noble Gases

Section: Chapter Questions

Problem 20.2QE

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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)…
Silicon carbide, SiC, has the three-dimensional structure shown in the figure. (a) Name another compound that has the same structure.(b) Would you expect the bonding in SiC to be predominantlyionic, metallic, or covalent? (c) How do the bondingand structure of SiC lead to its high thermal stability(to 2700 °C) and exceptional hardness?
(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.
(a) Draw the best Lewis structure(s) for the nitrite ion, NO2-.(b) With what allotrope of oxygen is it isoelectronic?(c) What would you predict for the lengths of the bondsin NO2- relative to N¬O single bonds and doublebonds?
. For each of the following, draw the Lewis structure, predict the ONO bond angle, and give the hybridization of the nitrogen. You may wish to review the chapters on chemical bonding and advanced theories of covalent bonding for relevant examples. (a) NO2 (b) NO-2
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