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What is the molecular geometry of ammonia (NH_3)?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
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Which of the following particle diagrams best represents molecules of only one compound in the gaseous phase?
A
A diagram showing a mixture of monatomic and diatomic particles.
B
A diagram showing identical diatomic molecules evenly spaced throughout the container.
C
A diagram showing clusters of three different types of molecules.
D
A diagram showing both molecules and ions present in the container.
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Understand that a compound consists of molecules made up of two or more atoms chemically bonded together in a fixed ratio and structure.
Recognize that in the gaseous phase, molecules of a single compound will be represented as identical particles evenly distributed throughout the container, reflecting the random motion and spacing typical of gases.
Identify that a diagram showing identical diatomic molecules (two atoms bonded together) evenly spaced represents a pure sample of one compound in the gas phase.
Note that diagrams showing mixtures (different types of particles, clusters, or ions) indicate multiple substances or phases, not a single compound.
Conclude that the correct diagram must show only one type of molecule, identical in composition and structure, dispersed evenly to represent a gaseous compound.
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