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PhysChem 1 Worksheet 009 Ind

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  STUDENT WORKSHEET OF PHYSICAL CHEMISTRY I: CHEMICAL STRUCTURE & BONDING   IGMA SANJAYA & DIAN NOVITA MOLECULAR ORBITAL THEORY (MOT)  Basic Competence : Understanding chemical bonding and its use for molecular structure determination Indicator : 1. To describe the formation of molecular orbital based on the principle of LCAO 2. To distinguish the orbital bonding, non bonding, and anti-bonding 3. To write electron configurations in the molecular orbitals 4. To determine the energy level and frequency of electronic transitions using the method of Huckel 5. To describe the current developments of molecular orbital theory. ================================================================================== WORKSHEET 009 1.   a. Jelaskan berdasarkan teori orbital molekul, dapatkah Anda menemukan orbital-orbital atomic dalam suatu molekul. ...................................................................................................................................................................................................... Lalu apa yang dimaksudkan dengan orbital molekul dan apa hubungannya dengan kerapatan elektron dalam suatu molekul? Jelaskan! ............................................................................................................................................................................................................ Jelaskan posisi orbital molekul, apakah terlokalisasi atau terdelokalisasi dan apa yang dimaksudkan dengan kedua istilah tersebut. ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... b. Based on the literature, the formation of chemical bonding is related to energy stability. To further clarify, draw the potential energy curve of a molecule. Complete the curve with notation of the distance of separation between the two cores R, the equilibrium bond length Re, and the bond dissociation energy De. Then explain the meaning of the curve.  STUDENT WORKSHEET OF PHYSICAL CHEMISTRY I: CHEMICAL STRUCTURE & BONDING   IGMA SANJAYA & DIAN NOVITA Fig. 1. a molecular potential energy curve. The explanation of the curve: ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 2.   a. Are you able to find the molecular ion of   ? In other words, is Hydrogen ion (proton) to form a chemical bonding with another Hydrogen ion (proton) to form a molecular ion of     Explain why this might be happening! ...................................................................................................................................................................................................... Are you able to find The molecular of   . In other words, weather the hydrogen atom tend to form a chemical bonding with another Hydrogen atom, explain the answer. ..................................................................................................................................................................................................... Based on the above, please explain what caused the attractive forces of atoms in chemical bonding. ...................................................................................................................................................................................................... Based on this, try to predict whether you can make   -molecular ion. Then explain the reason you thought so. ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 3.   a. Draw two thick black dots describing the position of proton A and proton B. Place a small dot of electron in any place around the two thick black dots. When you drag a force line from each protons to the electron, where the direction of motion of each proton relative to one another.  STUDENT WORKSHEET OF PHYSICAL CHEMISTRY I: CHEMICAL STRUCTURE & BONDING   IGMA SANJAYA & DIAN NOVITA Repeat this case by putting the electron in different locations, i.e. on the right location, on the left location, or in location between of the two protons. Describe where the location of electron so that their interactions caused both hydrogen atom cores or protons move closer with each other. ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Summarize the position of electron density distribution in chemical bonding. ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 4.   a. Draw a chemical bonding model of hydrogen molecular ion with two thick black dots mark each hydrogen nucleus A and B which is connected by the line R. Electron positioned at the location between the two hydrogen nuclei which connected to point A with r A  line and to point B with r B  line. When a force drown from point A to the electron and also from point B towards the electron, then explain what the point A (the core of the first hydrogen atom) and point B (the core of the second hydrogen atom) will toward each other or away from each other. ................................................................................................................................................................................................................................................................................................................................................................................................................................................  STUDENT WORKSHEET OF PHYSICAL CHEMISTRY I: CHEMICAL STRUCTURE & BONDING   IGMA SANJAYA & DIAN NOVITA ............................................................................................................................................................................................................................................ b. Write down in detail the Schrodinger equation to solve the case on the model 4.a. ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ c. Explain why the equation resulting in 4.b. is difficult to be solved. ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ d. Explain what Born-Oppenheimer assumed to resolve cases 4.a. which can be formulated in the 4.b. ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. e. What is the formulation of equation developed by Born-Oppenheimer as a result of the simplification of the Schrodinger equation obtained from section 4.b. .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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