Predict the molecular geometry for each. Match the words in the left column to the appropriate blanks in the sentences on the right.

Predict the molecular geometry for each. Match the words in the left column to the appropriate blanks in the sentences on the right. ResetHelp T-shaped square pyramidal tetrahedral linear trigonal bipyramidal seesaw square planar trigonal pyramidal octahedral bent trigonal planar The molecule BrO2− has a(n) The molecule B r O 2 − has a(n) blank molecular geometry. molecular geometry. The molecule ClO3− has a(n) The molecule C l O 3 − has a(n) blank molecular geometry. molecular geometry. The molecule CH3+ has a(n) The molecule C H 3 + has a(n) blank molecular geometry. molecular geometry. The molecule BrF3 has a(n) The molecule B r F 3 has a(n) blank molecular geometry. molecular geometry. The molecule XeF2 has a(n) linearThe molecule X e F 2 has a(n) blank molecular geometry. molecular geometry. The molecule AsF3 has a(n) The molecule A s F 3 has a(n) blank molecular geometry. molecular geometry.

Answers

1.)Part A

The molecular geometry of PH3 is trigonal pyramidal. We start with the Lewis structure of PH3. The molecule has eight valence electrons.

2.) Part B

Based on VSEPR Theory (Valence Shell Electron Pair Repulsion Theory) the electron clouds on atoms around the C will repel each other. As a result they will be pushed apart giving the CS2 molecule a linear molecular geometry or shape. The CS2 bond angle will be 180 degrees since it has a linear molecular geometry.

3.) Part 3

Water or H2O has 8 electrons around the central oxygen atom. This means there are four electron pairs arranged in a tetrahedral shape. There are two bonding pairs and two lone pairs. The resulting shape is bent with an H-O-H angle of 104.5°.

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4 and 5

Explanation:

a. The molecular geometry is based only on the arrangement of atoms, not the arrangement of the electrons

Explanation:

As we know that molecules geometry is the three dimensional arrangement of molecule.Molecules geometry includes bond angles,bond length ,torsional angle and others parameters which describe the geometry.

When molecules are arrange in proper manner then it is known as molecular geometry and when two lone pairs of electron does not present then it known as electronic geometry.

So the option a is correct.

a. The molecular geometry is based only on the arrangement of atoms, not the arrangement of the electrons

BrO2-bent

ClO3−trigonal pyramidal

CH3+trigonal planar

BrF3 T-shaped

XeF2 linear

AsF3. trigonal pyramidal

Explanation:

For BrO2-, there are two shapes possible for any three atom molecule; linear or bent. In this case, starting with 7 electrons around a Br atom and at least two formal bonds it is safe to say that it will be bent because there will have to be an accommodated one lone pair on the central atom Br.

Based on VSEPR Theory the electron clouds on atoms and lone pair of electrons around the central Cl atom will repel each other. As a result they will be pushed apart giving the ClO3- molecule a trigonal pyramidal geometry or shape.

Carbon has 4 valence electrons. But in CH3+, a positive charge makes the number of available electrons 3. Hence carbon forms 3 single bonds with H to form a planar structure with sp2 hybridization.

BrF3 contains three bonded and two nonbonded electron domains, giving a trigonal bipyramidal electron domain geometry and a T shaped molecular geometry. The bond angles are compressed relative to those ones in a perfect trigonal bipyramid due to lone pairs spreading out more in space than bonded pairs.

XeF2 has 22 valence electrons, out of which there are three lone pairs of electrons. Its hybridization is sp3d. According to the VSEPR theory, The molecular geometry of the molecule is linear. The bond angle of F-Xe-F is 180 degrees.

The molecule AsF3 has four electron domains around the central atom. Hence the electron domain geometry is Tetrahedral. As there is one non bonded electron pair, the molecular geometry is thus Trigonal pyramidal.

The correct answer is option 4 and 5.

The electron domain geometry for an ammonia molecule, NH₃ has tetrahedral electron domain geometry. In NH₃ there are three bond pair electrons and one lone pair electron. Therefore, NH₃ has four electron pairs which are distributed in a tetrahedral shape.

The molecular geometry for an ammonia molecule, NH₃ is trigonal-pyramidal molecular geometry. Ammonia has one lone pair of electron and three bond pairs of electrons thus the resulting molecular geometry is trigonal-pyramidal.  

The correct answer is option c.

Explanation:

Molecular geometry is defined as three dimensional arrangement of the atoms constituting the molecule in a space. It gives us picture of the shape of the molecule , its bond lengths, bond angles and other parameter related to it which tell us about the positions of the atoms.

Electron pair geometry is defined as three dimensional arrangement of the electrons around the central atoms. Or it can also be define as arrangement of atoms and lone pair in three dimensional space which along position of atoms also tells the us the position of lone pairs.

The electron-domain geometry is linear. The molecular geometry is linear.

Explanation:

According to the valence shell electron pair repulsion theory (VSEPR), the shape of a molecule depends on the arrangement of electron pairs present on the valence shell of the central atom of the molecule. Electron pairs are arranged in such a way as to minimize repulsion between them. The electron pairs are positioned as far apart in space as possible.

In CS2, both the molecular and electron pair geometries are linear because the electron pairs and bonding groups are positioned at an angle of 180° from each other. Hence the answer.

KrF2‡ 5 trigonal bipyramid
   
  the electron geometry is tetrahedral due to four groups surrounding the
sulfur atom ( 2 lone pairs and 2 hydrogens) 
 the molecular geometry of the hydrogen sulfide i found to be bent (which i
havnt come across in uni for some reason) 
 and due to the lone pair repulsion of the S-H bonds the angle will be
considerably less than 109.5 degrees, around 92 degrees.   
 the differenece between molecular and electronic is that molecular takes into
account only the bonded substituents around the sulfur such as the
hydrogens, while the electronic geometry is the geometry of the localised
electron densities( bonds and lone pairs).

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