Textbook Question
Which type (or types) of crystalline solid is characterized by each of the following? (c) high melting point and poor electrical conductivity;
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Ch.12 - Solids and Modern Materials
Chapter 12, Problem 16
Indicate the type of solid (molecular, metallic, ionic, or covalent-network) for each compound: (a) InAs, (b) MgO, (c) HgS, (d) In, (e) HBr.
Verified step by step guidance1
Step 1: Understand the types of solids. Molecular solids consist of molecules held together by intermolecular forces. Metallic solids are composed of metal atoms with a 'sea of electrons'. Ionic solids are formed from cations and anions held together by electrostatic forces. Covalent-network solids have atoms connected by covalent bonds in a continuous network.
Step 2: Analyze compound (a) InAs. Indium arsenide (InAs) is a compound formed from indium (a metal) and arsenic (a metalloid). It forms a covalent-network solid due to the strong covalent bonds between the atoms in a continuous lattice structure.
Step 3: Analyze compound (b) MgO. Magnesium oxide (MgO) consists of magnesium ions (Mg²⁺) and oxide ions (O²⁻). The electrostatic attraction between these oppositely charged ions forms an ionic solid.
Step 4: Analyze compound (c) HgS. Mercury(II) sulfide (HgS) is composed of mercury and sulfur. It forms an ionic solid due to the ionic bonding between Hg²⁺ and S²⁻ ions.
Step 5: Analyze compound (d) In and (e) HBr. Indium (In) is a metal, so it forms a metallic solid. Hydrogen bromide (HBr) is a molecular compound, forming a molecular solid due to the weak intermolecular forces between HBr molecules.
Related Practice
Textbook Question
Which type (or types) of crystalline solid is characterized by each of the following? (d) network of covalent bonds.
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Textbook Question
Indicate the type of solid (molecular, metallic, ionic, or covalent-network) for each compound: (c) Ta2O5 (melting point, 1872°C)
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Textbook Question
You are given a gray substance that melts at 700 °C; the solid is a conductor of electricity and is insoluble in water. Which type of solid (molecular, metallic, covalent-network, or ionic) might this substance be?
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Open Question
You are given a white substance that melts at 100 °C. The substance is soluble in water. Neither the solid nor the solution is a conductor of electricity. Which type of solid (molecular, metallic, covalent-network, or ionic) might this substance be?
Textbook Question
(a) Draw a picture that represents a crystalline solid at the atomic level.
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