Hybrid Orbitals in Chemistry

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Questions and Answers

What is the orientation angle of sp hybrid orbitals?

  • 360°
  • 90°
  • 120°
  • 180° (correct)

Which molecule undergoes sp hybridization forming a linear electron domain geometry?

  • CH4
  • NH3
  • H2O
  • BeCl2 (correct)

In ethyne (C2H2), how many pi bonds are formed between the carbon atoms?

  • One
  • Four
  • Three
  • Two (correct)

What hybridization results from the combination of one s orbital and two p orbitals?

<p>sp2 (A)</p> Signup and view all the answers

What is the angle between the sp2 hybrid orbitals?

<p>120° (D)</p> Signup and view all the answers

What is the predicted hybridization type for boron trifluoride (BF3)?

<p>sp2 (A)</p> Signup and view all the answers

What molecular shape does ammonia (NH3) exhibit?

<p>trigonal pyramidal (C)</p> Signup and view all the answers

Which bond type is formed by end-to-end overlapping of atomic orbitals?

<p>Sigma (s) bond (B)</p> Signup and view all the answers

What is the approximate bond angle in a water (H2O) molecule?

<p>104.5Ëš (A)</p> Signup and view all the answers

In water, how many sp3 hybrid orbitals on oxygen are used for bonding with hydrogen?

<p>Two (C)</p> Signup and view all the answers

What effect does the lone pair of electrons on nitrogen in NH3 have on the bond angles?

<p>Decreases them from 109.5Ëš (A)</p> Signup and view all the answers

How many nonbonding pairs of electrons are found in the oxygen of water (H2O)?

<p>Two (D)</p> Signup and view all the answers

What happens to a paired 2s electron in the context of hybridization discussed?

<p>It is promoted to a higher orbital (C)</p> Signup and view all the answers

What type of hybridization is characterized by combining one s orbital and three p orbitals?

<p>sp3 (D)</p> Signup and view all the answers

In ammonia (NH3), how many of the sp3 hybrid orbitals are half-filled and available for bonding?

<p>3 (B)</p> Signup and view all the answers

Which molecular geometry is associated with sp3 hybridized atoms?

<p>Tetrahedral (B)</p> Signup and view all the answers

Which molecule is an example of sp2 hybridization?

<p>Boron trifluoride (BF3) (D)</p> Signup and view all the answers

What hybridization description applies to the carbon atom in methane (CH4)?

<p>sp3 (B)</p> Signup and view all the answers

Which of the following is true about the lobes of an sp3 hybrid orbital?

<p>One lobe is larger than the other. (B)</p> Signup and view all the answers

What distinguishes the nitrogen atom in ammonia compared to the carbon atom in methane?

<p>Nitrogen has a lone pair of electrons. (C)</p> Signup and view all the answers

Which type of overlap occurs when the s-orbital of one atom overlaps with the half-filled p-orbital of another atom?

<p>s-p overlapping (B)</p> Signup and view all the answers

In which type of overlapping do p-orbitals from two atoms align along the internuclear axis?

<p>p-p overlapping (A)</p> Signup and view all the answers

What is a key characteristic of pi (p) bonds?

<p>Cannot be directly observed experimentally (B)</p> Signup and view all the answers

What happens to the 2s electron in the formation of a pi bond?

<p>It is promoted to a 2py orbital. (B)</p> Signup and view all the answers

Which of the following examples involves s-s overlapping?

<p>H2 (D)</p> Signup and view all the answers

What effect does the presence of a pi bond have on bond length?

<p>Shortens the bond length compared to single bonds (B)</p> Signup and view all the answers

What type of overlap is specifically referred to as lateral or sidewise overlap?

<p>p-p overlapping (A)</p> Signup and view all the answers

Which of the following compounds is not an example of p-p overlapping?

<p>CaO (A)</p> Signup and view all the answers

What occurs during the hybridization process of beryllium in BeCl2?

<p>An s orbital is mixed with a p orbital to form sp hybrid orbitals. (D)</p> Signup and view all the answers

What character do the sp hybrid orbitals contain?

<p>Equal amounts of s and p character (C)</p> Signup and view all the answers

Which of the following statements about the remaining p orbitals after hybridization in beryllium is true?

<p>The remaining p orbitals remain unoccupied. (A)</p> Signup and view all the answers

What characteristic shape do sp hybrid orbitals resemble?

<p>They resemble the shape of unhybridized p orbitals. (B)</p> Signup and view all the answers

Which of the following beryllium compounds undergo hybridization to form sp orbitals?

<p>BeF2, BeH2, and BeCl2 (C)</p> Signup and view all the answers

What promotes one of the electrons in the beryllium atom during hybridization?

<p>It is promoted to the empty px orbital. (C)</p> Signup and view all the answers

Which type of hybridization is specifically referred to in this context?

<p>sp hybridization (B)</p> Signup and view all the answers

What is the main feature that differentiates a sigma bond from a pi bond?

<p>Sigma bonds involve end to end overlapping of half filled atomic orbitals. (C)</p> Signup and view all the answers

Which statement is true regarding the rotation of bonds?

<p>Pi bonds do not allow for free rotation. (B)</p> Signup and view all the answers

What contributes to the strength difference between sigma and pi bonds?

<p>The extent of overlapping between atomic orbitals. (C)</p> Signup and view all the answers

Which bond can exist independently without the presence of another bond?

<p>Sigma bond (C)</p> Signup and view all the answers

How is boron trifluoride (BF3) predicted to form bonds?

<p>By promoting paired 2s electrons to empty p orbitals. (D)</p> Signup and view all the answers

What type of molecular orbital is formed from the overlapping of p orbitals in a pi bond?

<p>Two lobes positioned above and below the internuclear axis. (B)</p> Signup and view all the answers

What is the significance of a paired electron in the formation of bonds?

<p>It can be promoted to higher energy orbitals for bonding. (D)</p> Signup and view all the answers

What aspect of bond formation is reflected in the greater strength of sigma bonds compared to pi bonds?

<p>Greater overlap between atomic orbitals. (D)</p> Signup and view all the answers

Flashcards

sp Hybridization

The process of combining one s orbital and one p orbital, resulting in two equivalent hybrid orbitals oriented in a straight line (180° angle).

Electron Promotion

The process of moving an electron from a paired orbital to an empty orbital within the same energy level, as part of hybridization.

sp Hybrid Orbitals

The resulting hybrid orbitals from sp hybridization, each containing equal amounts of s and p characteristics.

Hybridization in Beryllium

Beryllium atoms, in their neutral state, have all paired electrons in their outermost shell. They therefore undergo hybridization to achieve more stable bonding.

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Hybridization

The combination of orbitals of the same quantum number is called hybridization. A hybrid orbital is an orbital that results from the hybridization process.

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Hybrid Orbital Angle (sp)

The angle between the two sp hybrid orbitals, which is 180°. This leads to linear molecular geometry.

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Unhybridized p Orbitals

In sp hybridization, the two remaining p orbitals (p_y and p_z) don't participate in the process and stay unoccupied.

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sp Hybrid Orbital Shape

The shape of sp hybrid orbitals, similar to p orbitals with one lobe being larger than the other. This facilitates stronger and more directional bonding.

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Hybridization in Ammonia (NH3)

In ammonia (NH3), the nitrogen atom forms three N-H bonds and has one lone pair of electrons. The four orbitals involved in bonding and the lone pair are sp3 hybridized, resulting in a tetrahedral arrangement. The lone pair exerts a slightly greater repulsive force, pushing the N-H bonds away from the top of the pyramid, resulting in slightly smaller H-N-H bond angles (107.3°) compared to a perfect tetrahedral structure (109.5°).

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Hybridization in Water (H2O)

In water (H2O), the oxygen atom is sp3 hybridized, with two of the hybrid orbitals forming bonds with the two hydrogen atoms, and the other two orbitals containing the lone pairs. This arrangement results in a bent molecular shape with an angle of approximately 104.5°.

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Sigma (σ) Bond

A type of covalent bond formed by the direct overlap (end-to-end) of atomic orbitals along the internuclear axis. This type of overlap is also called 'head-on' or 'axial' overlap.

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Pi (Ï€) Bond

A type of covalent bond formed by the sideways overlap of atomic orbitals above and below the internuclear axis. This overlap results in a bond with electron density concentrated above and below the plane of the sigma bond.

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Pi Bond

The sideways overlap of unhybridized p-orbitals on adjacent carbon atoms leads to the formation of pi bonds. Pi bonds are weaker than sigma bonds and contribute to the double or triple bonds in molecules.

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Sigma Bond

The head-on overlap of hybridized orbitals, or an s orbital and a hybridized orbital, on adjacent atoms leads to the formation of sigma bonds. These bonds are strong and are the primary bonds in a molecule.

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Methane (CH4) hybridization

The molecule has a tetrahedral arrangement with four sp3 hybrid orbitals around the central atom. Each sp3 orbital forms a sigma bond with a hydrogen atom.

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Ammonia (NH3) hybridization

The nitrogen atom uses sp3 hybridization to form a trigonal pyramidal structure. Three of the sp3 orbitals form sigma bonds with hydrogen atoms, and the fourth sp3 orbital contains a lone pair of electrons.

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Water (H2O) hybridization

The oxygen atom uses sp3 hybridization to form a bent structure. Two of the sp3 orbitals form sigma bonds with hydrogen atoms, and the remaining two sp3 orbitals contain lone pairs of electrons.

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Boron trifluoride (BF3) hybridization

Boron trifluoride (BF3) has sp2 hybridization, resulting in a trigonal planar geometry. The boron atom forms three sigma bonds with fluorine atoms.

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Covalent Bond Strength

The strength of a covalent bond is determined by the amount of overlap between the atomic orbitals involved.

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Sigma vs. Pi Bond Strength

Sigma bonds are stronger than Pi bonds because of the greater extent of overlapping.

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Rotation Around Bonds

The formation of a Sigma bond allows free rotation around the bond axis, while Pi bonds restrict rotation.

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Bond Formation

Sigma bonds can exist alone, while Pi bonds always form in addition to a Sigma bond.

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Orbital Types in Bonding

Sigma bonds are formed from the overlap of s and p atomic orbitals, while Pi bonds are formed from the overlap of only p orbitals.

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Covalent Bond Formation

The overlap of atomic orbitals forms molecular orbitals and covalent bonds, where electrons are shared between atoms.

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What type of overlapping is involved in the formation of an H2 molecule?

One of the ways sigma bonds can occur in a molecule, where the s-orbital of one atom overlaps with the s-orbital of another atom, leading to the formation of an H2 molecule.

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s-p Overlapping

A type of sigma bond formed when the s-orbital of one atom overlaps with the half-filled p-orbital of another atom, forming molecules like HF and HCl.

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p-p Overlapping

Another type of sigma bond formed when the p-orbitals of two atoms overlap directly along the internuclear axis, leading to the formation of molecules such as F2, Cl2, and Br2.

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How does the presence of a pibond explain the shorter bond length in ethylene?

The presence of a pi bond, which is stronger and shorter than a single bond, leads to a shorter bond length in ethylene compared to molecules with single carbon-carbon bonds. This is because the pi bond contributes to the overall bond strength.

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Is there a correlation between pi bond and the number of bonds?

The presence of a pibond means two atoms are bonded by a double bond instead of a single bond. It is also called a double bond.

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How does a pi bond affect rotation?

The pibond allows for free rotation around the bond axis in molecules like ethane, unlike restricted rotation around the double bond in ethylene.

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Study Notes

Hybrid Orbitals

  • Hybrid orbitals are formed by mixing atomic orbitals.
  • The mixing creates new orbitals with properties intermediate between the original unhybridized orbitals.
  • The number of hybrid orbitals produced equals the number of unhybridized orbitals.
  • The hybridized orbitals exhibit equivalent energy and shape.
  • The number of orbitals that undergo hybridization results in the same number of new hybrid orbitals.
  • Hybridized orbitals orient themselves in preferred directions in space, thus influencing molecular shapes.
  • Only valence shell orbitals of an atom are hybridized.
  • The energy difference between the orbitals undergoing hybridization should be minimal.
  • Not only half-filled orbitals, but also filled orbitals, can take part in hybridization.
  • Promotion of electrons to higher orbitals is not crucial for hybridization to occur.
  • Before hybridizing, determine whether the ground state electronic configuration applies.
  • Electrons are promoted from one orbital to a higher orbital for hybridization, based on the hybridization type.
  • Combining orbitals results in more stable hybrid orbitals.
  • The number of orbitals mixed equals the number produced afterward.
  • The hybrid orbitals formed afterward share similar shapes and sizes.

Types of Hybridization

sp Hybridization

  • One 's' orbital and one 'p' orbital combine to create two equivalent 'sp' hybrid orbitals.
  • The angle between the 'sp' orbitals is 180°.
  • Examples of molecules with sp hybridization include BeFâ‚‚, BeHâ‚‚ and BeClâ‚‚.
  • The beryllium atom contains only paired electrons and thus must undergo hybridization.
  • One of the 2s electrons is promoted to an empty 2px orbital.
  • Only occupied orbitals participate in the hybridization process, producing two sp hybrid orbitals.
  • The two remaining p-orbitals (namely 2py and 2pz) remain unhybridized.
  • The resulting sp orbitals are similar in shape to the original p orbitals but differ significantly.
  • Other molecules incorporating sp hybridization that require the use of sp hybrid orbitals include COâ‚‚ and Câ‚‚Hâ‚‚.
  • The sp orbitals in these molecules also appear similar to the original p orbital shape but have a significant difference.

sp² Hybridization

  • One 's' orbital and two 'p' orbitals combine to generate three equivalent 'sp²' hybrid orbitals.
  • The angle between the 'sp²' orbitals is 120°.
  • All three 'sp²' hybrid orbitals lie in one plane.
  • Examples include BCℓ₃, BеClâ‚‚, and compounds like these.
  • The first step involves promoting a paired 2s electron to an empty 2p orbital.
  • The hybridization of the three occupied orbitals produces three 'sp²' hybrids, leaving the 2pz orbital untouched.
  • The molecular shape is trigonal planar.
  • Each sp² hybrid orbital forms a bond with a p orbital.
  • The lobes of the sp² hybrid orbitals point towards the corners of an equilateral triangle.
  • Ethylene(Câ‚‚Hâ‚„) also shows sp² hybridization: the carbon atoms use sp² hybrid orbitals to bond with each other and hydrogen atoms.

sp³ Hybridization

  • One 's' orbital and three 'p' orbitals combine to create four equivalent 'sp³' hybrid orbitals.
  • The angle between the 'sp³' orbitals is 109.5°.
  • The four 'sp³' hybrid orbitals are oriented towards the corners of a tetrahedron.
  • Methane (CHâ‚„), Ammonia (NH₃), and Water (Hâ‚‚O) are molecules with sp³ hybridization.
  • In methane, each carbon sp³ hybrid orbital bonds with a hydrogen 1s orbital.
  • The hybridization process in Ammonia involves the promotion of a paired 2s electron in the nitrogen atom to an empty 2p orbital.
  • Forming sp³ hybrid orbitals leaves one unhybridized p orbital.

Sigma (σ) and Pi (π) Bonds

  • Covalent bonds can be sigma or pi bonds, dependent on overlap type.
  • Sigma bonds result from head-on overlap of atomic orbitals along an internuclear axis.
  • Pi bonds arise from side-to-side overlap of atomic orbitals perpendicular to the internuclear axis.
  • Sigma bonds are stronger than pi bonds due to greater overlap.
  • Pi bonds can only exist alongside a sigma bond. Multiple bonds (double or triple) involve sigma and pi bonds.
  • The presence, type, and strength of bonds influence chemical reaction patterns.

VSEPR Theory

  • Valence Shell Electron Pair Repulsion theory (VSEPR) explains molecular shapes.
  • Electron pairs surrounding the central atom arrange as far apart as possible, minimizing repulsion.
  • Lone pairs repel more strongly than bonding pairs.
  • The order of repulsions: lone pair-lone pair > lone pair-bonding pair > bonding pair-bonding pair.
  • Multiple bonds are treated as single electron pairs for VSEPR purposes.
  • VSEPR helps determine molecular shapes, influencing properties like polarity.

Molecular Shapes

  • Molecular shapes depend on specific atom arrangements and bond angles (predictable through VSEPR).
  • Understanding molecular shapes helps study polarity, symmetry, and hence physical/chemical properties of compounds.
  • The VSEPR theory helps visualize these 3-dimensional molecular structures.

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