Molecular Structure (Ps 27)
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An molecule will be which of the following shapes?
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Tetrahedral
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Trigonal bipyramidal
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Square pyramidal
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Trigonal planar
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Square planar
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Explore molecular shapes and electron configurations in 'Molecular Structure (PS 27)'. Assess your understanding of trigonal bipyramidal structures, resonance in molecules like HNO3, and electron pair geometry in various compounds. Ideal for students enhancing their chemistry knowledge.
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Resonance structures are needed to describe the bonding in which of the following molecules?
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H2O
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ClF3
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HNO3
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CH4
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NH3
Correct Answer
A. HNO3Explanation
HNO3, also known as nitric acid, contains a central nitrogen atom bonded to three oxygen atoms and one hydrogen atom. The nitrogen atom has a formal charge of +1 and forms a double bond with one of the oxygen atoms, while the other two oxygen atoms each have a single bond with the nitrogen atom. This arrangement can be represented by drawing two resonance structures, showing the double bond alternating between the nitrogen and different oxygen atoms. Resonance structures are needed to accurately describe the delocalization of electrons in the molecule.Rate this question:
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- 3.
Which of the following has more than one unshared pair of valence electrons on the central atom?
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BrF5
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NF3
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IF7
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ClF3
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CF4
Correct Answer
A. ClF3Explanation
ClF3 has more than one unshared pair of valence electrons on the central atom. This is because chlorine (Cl) has 7 valence electrons and forms 3 single bonds with fluorine (F) atoms, leaving 2 unshared pairs of electrons on the chlorine atom.Rate this question:
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- 4.
The species in the followin set do no include which of the following geometries? SiCl4, BrF4-, C2H2, TeF6, NO3-
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Square planar
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Tetrahedral
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Octahedral
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Trigonal pyramidal
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Linear
Correct Answer
A. Trigonal pyramidalExplanation
The species in the given set do not include the trigonal pyramidal geometry. The other geometries mentioned, such as square planar, tetrahedral, octahedral, and linear, can be found in the set. However, the trigonal pyramidal geometry is not present.Rate this question:
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- 5.
Regular tetrahedral molecules or ions include which of the following? I. CH4 II. SF4 III. NH4+
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I, II, and III
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I and III only
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I only
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I and II only
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II only
Correct Answer
A. I and III onlyExplanation
The correct answer is "I and III only". This is because a regular tetrahedron has four equal sides and four equal angles. In molecule I (CH4), the carbon atom is bonded to four hydrogen atoms, forming a regular tetrahedral shape. In ion III (NH4+), the nitrogen atom is bonded to four hydrogen atoms, also forming a regular tetrahedral shape. Molecule II (SF4) does not have a regular tetrahedral shape as it has a trigonal bipyramidal shape with one lone pair.Rate this question:
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Mar 21, 2023Quiz Edited by
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Mar 25, 2012Quiz Created by
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