In the LCAO-MO approach, there are 3 important characteristics that two atomic orbitals, on different atoms,...
In the LCAO-MO approach, there are 3 important characteristics that two atomic orbitals, on different atoms, must share in order to come together to form a molecular orbital. What are these three things, for five points each?
condition1:
2:
3:
Homework Answers
Conditions for effective linear combination of atomic orbitals (LCAO):
- The combining atomic orbitals should have same or nearly same energy.
- The atomic orbitals should have the same symmetry about the molecular axis.
- Two atomic orbitals should overlap signifcantly for effective bond formation.
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In
the LCAO-MO approach, there are 3 important
characteristics that two atomic
orbitals, on different atoms,...
Please show all your work in the space provided. 1. (15 pts) in the LCAO-MO approach,...
Please show all your work in the space provided. 1. (15 pts) in the LCAO-MO approach, there are three important characteristics that two atomic orbitals, on different atoms, must share in order to come together to form a molecular orbital. What are these three things, for five points each? Condition #1: Condition #2: 2, Condition #3: (20 pts) A hydrogen atom is excited to a 3d electronic state. Two photons are emitted, one after the other. For ten points each,...
Consider two 2p orbitals, one on each of two different atoms, that are oriented side-to-side as...
Consider two 2p orbitals, one on each of two different atoms, that are oriented side-to-side as in the figure. Imagine bringing these nuclei together so that overlap occurs as shown in the figure. This overlap results in a system of molecular orbitals, 88-8. Construct an orbital interaction diagram for molecular orbital formation using the images that represent various orbital types (e.g., atomic, bonding, antibonding). Additionally, identify the number of nodes in each atomic and molecular orbital. Answer Bank
Consider two 2p orbitals, one on each of two different atoms, oriented side-to-side, as in the...
Consider two 2p orbitals, one on each of two different atoms, oriented side-to-side, as in the figure. Imagine bringing these nuclei together so that overlap occurs as shown in the figure. This overlap results in a system of molecular orbitals. (Scroll down to answer part "c)".) a) Below, construct an orbital interaction diagram for molecular orbital formation by dragging the images triat represent various orbital types (e.g., atomic, bonding, antibonding) into the relevant boxes. b) Identify the number of nodes in each...
Draw a labelled diagram showing the atomic orbitals for N and O on each side and...
Draw a labelled diagram showing the atomic orbitals for N and O on each side and the molecular orbitals for NO, in the middle. The diagram should clearly show: which atomic orbitals combine to form each molecular orbital, the relative position (increasing energy going up the page) of the molecular orbitals and the locations of electrons in the atomic orbitals and in the molecular orbitals. Use your diagram to determine the following: What is the bond order? Explain how you...
Question #4 & #5? 3) Using Early and Late Molecular Orbitals, draw the two M.O. diagrams...
Question #4 & #5?
3) Using Early and Late Molecular Orbitals, draw the two M.O. diagrams for NO , determine which is most stable; calculate and state bond order of each, state diamagnetic or paramagnetioc d if paramagnetic and by how many electrons. an 4) If four hydrogens, each with its 1s orbital, and two carbons, each with its one 2s and three 2p orbitals, form a molecule, then how many molecular orbitals will there be? How many bonding orbitals,...
5. Molecular orbitals are formed by the overlap of atomic orbitals. Thus, n atomic orbitals can combine (overlap) t...
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4. On the basis of molecular orbitals and molecular orbital diagrams, predict which molecule in each...
4. On the basis of molecular orbitals and molecular orbital diagrams, predict which molecule in each series will have the longest bond. Be sure to provide a brief explanation a. B2, B2 b. 02*, 0,- c. HHe", Hz 5. Consider the hydroxide ion, OH and do the following: a. Prepare a molecular orbital diagram and fill with electrons given the following atomic orbital potential energies: O(2s) = -32.3 eV, O(2p) = -15.8 eV, H(s) -13.6 eV. Be sure to label...
(a) write the minimal basis set of atomic orbitals for the acetylene molecule. (b) on the...
(a) write the minimal basis set of atomic orbitals for the
acetylene molecule.
(b) on the diagram to the right draw in the atomic orbitals
that are the main contributors to the molecular orbital on its
left. Indicate the phase (positive or negative) of each lobe of
each atomic orbital by shading in the negative lobes.
3. Cartoons A-E below show the occupied bonding orbitals of acetylene (ethyne) The lighter shaded lobes are positive, and the darker lobes are negative....
13. (14 pts) MO Theory Draw the complete (core and valence) molecular orbital energy level diagram...
13. (14 pts) MO Theory Draw the complete (core and valence) molecular orbital energy level diagram for the homonuclear diatomic molecule Be2. Use standard MO symbols to label the energy levels (That is: o, o, , or n*, as needed, with subscripts indicating which atomic orbitals formed them.) a. Sketch the molecular orbital formed when two 2p orbitals, one each on each Be atom, overlap to form a o antibonding MO b. Using your MO energy level diagram in (a),...
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Exercise 3: (a) In a molecule of HNNH the H atoms hybridize. do | do not (b) the N atomshybridize do I do not (c) This means the energy diagram of a H atom change. will | will not (d) And the energy diagram of a N atom change. will I will not (e) Draw any modifications to the energy and boundary diagrams for the atoms in HNNH that you indicate hybridize. When the orbitals of these atoms come together...
Please show all your work in the space provided. 1. (15 pts) in the LCAO-MO approach, there are three important characteristics that two atomic orbitals, on different atoms, must share in order to come together to form a molecular orbital. What are these three things, for five points each? Condition #1: Condition #2: 2, Condition #3: (20 pts) A hydrogen atom is excited to a 3d electronic state. Two photons are emitted, one after the other. For ten points each,...
Consider two 2p orbitals, one on each of two different atoms, that are oriented side-to-side as in the figure. Imagine bringing these nuclei together so that overlap occurs as shown in the figure. This overlap results in a system of molecular orbitals, 88-8. Construct an orbital interaction diagram for molecular orbital formation using the images that represent various orbital types (e.g., atomic, bonding, antibonding). Additionally, identify the number of nodes in each atomic and molecular orbital. Answer Bank
Question #4 & #5?
3) Using Early and Late Molecular Orbitals, draw the two M.O. diagrams for NO , determine which is most stable; calculate and state bond order of each, state diamagnetic or paramagnetioc d if paramagnetic and by how many electrons. an 4) If four hydrogens, each with its 1s orbital, and two carbons, each with its one 2s and three 2p orbitals, form a molecule, then how many molecular orbitals will there be? How many bonding orbitals,...
5. Molecular orbitals are formed by the overlap of atomic orbitals. Thus, n atomic orbitals can combine (overlap) to form n molecular orbitals. In 1,3-butadiene there are four atomic p orbitals which can combine to form four 7 molecular orbitals. In ethene there are two atomic p orbitals which can combine to form two y molecular orbitals. The drawings below show the different ways in which the p orbitals of ethene and 1,3- butadiene can be combined to form the...
4. On the basis of molecular orbitals and molecular orbital diagrams, predict which molecule in each series will have the longest bond. Be sure to provide a brief explanation a. B2, B2 b. 02*, 0,- c. HHe", Hz 5. Consider the hydroxide ion, OH and do the following: a. Prepare a molecular orbital diagram and fill with electrons given the following atomic orbital potential energies: O(2s) = -32.3 eV, O(2p) = -15.8 eV, H(s) -13.6 eV. Be sure to label...
(a) write the minimal basis set of atomic orbitals for the
acetylene molecule.
(b) on the diagram to the right draw in the atomic orbitals
that are the main contributors to the molecular orbital on its
left. Indicate the phase (positive or negative) of each lobe of
each atomic orbital by shading in the negative lobes.
3. Cartoons A-E below show the occupied bonding orbitals of acetylene (ethyne) The lighter shaded lobes are positive, and the darker lobes are negative....
13. (14 pts) MO Theory Draw the complete (core and valence) molecular orbital energy level diagram for the homonuclear diatomic molecule Be2. Use standard MO symbols to label the energy levels (That is: o, o, , or n*, as needed, with subscripts indicating which atomic orbitals formed them.) a. Sketch the molecular orbital formed when two 2p orbitals, one each on each Be atom, overlap to form a o antibonding MO b. Using your MO energy level diagram in (a),...
Exercise 3: (a) In a molecule of HNNH the H atoms hybridize. do | do not (b) the N atomshybridize do I do not (c) This means the energy diagram of a H atom change. will | will not (d) And the energy diagram of a N atom change. will I will not (e) Draw any modifications to the energy and boundary diagrams for the atoms in HNNH that you indicate hybridize. When the orbitals of these atoms come together...
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