Ch.11 - Liquids, Solids & Intermolecular ForcesWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Two solids are shown below. One is a semiconductor and one is an insulator.Which one is which? Explain your reasoning.

Solution: Two solids are shown below. One is a semiconductor and one is an insulator.Which one is which? Explain your reasoning.

Problem

Two solids are shown below. One is a semiconductor and one is an insulator.

Photographs of two piles of powder. The top pile has a wider diameter than the bottom and is nearly white, while the bottom power is rust colored.


Which one is which? Explain your reasoning.

Solution

Semiconductors are materials that can conduct electricity but not as well as metals. Semiconductors form an energy gap between the filled and empty states, much like the energy gap between bonding and antibonding orbitals. 

Occupied bonding molecular orbitals → valence band

Unoccupied antibonding molecular orbitals → conduction band

These two bands are separated by the energy band gap Eg

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