practice modeling molecules and exploring the capabilities of the ChemOffice programs. The minimum energy was found for each of the three molecules tested and the strain energy at different dihedral angles was plotted. The first molecule‚ butane‚ was easily completed but amphetamine and U4EA caused some difficulty. The results of the last two were not very conclusive. INTRODUCTION The purpose of this lab was to explore the capabilities of ChemOffice in the realm of modeling molecules. The strain
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another element are represented by bolts. After examining each model‚ complete the following tasks: a. sketch a representative molecular picture of the model; b. describe the composition of the model in words (does the model contain atoms‚ molecules‚ or both?; does the model represent elements‚ compounds‚ or both?; does the model represent a pure substance or a mixture?) c. write the "chemical formula" of the model‚ using B as the symbol for a bolt and N for a nut. Lab report requirements:
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inter- or intra-molecularly because of the partially positive charge of H and the partially negative charge of O/N/F‚ Van der Waals between neutral atoms with partially charged regions due to asymmetric electron accumulation by chance. The atoms/molecules must be very close together * What are their similarities and differences? * What happens when a
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* Microbiology: Study of microorganisms Most microorganisms are pathogenicFalse The majority of bacteria are harmless True Total number of bacterial species: about 10 million to a billion What is a microorganism? An organism or virus too small to be seen without a microscope. (Smaller than 0.5 mm) Ex: Bacteria‚ Fungi‚ Protozoa‚ Algae‚ and Viruses Microbiom: collection of microbes Human cells vs. Microbial cells = 1:10 Which statement about Michaelangelo is not correct? A. He was
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Molecular-Orbital Theory Introduction Orbitals in molecules are not necessarily localized on atoms or between atoms as suggested in the valence bond theory. Molecular orbitals can also be formed the LCAO where more than two atomic orbitals are used. (Technically‚ we can use all of the atomic orbitals in the LCAO.) Linear combinations of orbitals result in the interference of waves. Both constructive and destructive interference may result. Within a diatomic molecule‚ N atomic orbitals on atom 1 and N atomic
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Intermolecular forces exist between independent particles‚ such as atoms‚ ions‚ or molecules. They can be forces of either attraction or repulsion. The amount of charge‚ how it is distributed‚ and the length of time that a charge distribution exists can affect the strength of intermolecular forces. And despite having variable force strengths‚ all intermolecular forces are considered weak compared to chemical bonds‚ or intramolecular forces. Chemical bonds are not only stronger; they are also more
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Phytochemical and Antimicrobial study of Laptedenia pyrotechnica Forssk. Decne from Cholistan desert‚Pakistan. Nadeem Ahmed1‚S.S.Tahir1‚ M.Farman2‚ Asghari Bano1 1 : Department of Plant Sciences‚ Quaid-i-Azam University‚ Islamabad. Pakistan Council for scientific and industrial research‚ H-9‚ Islamabad. 2: Department of Chemistry‚ Quaid-i-Azam University‚ Islamabad. ABSTARCT The present study reveals the chemical composition and antimicrobial activity of extracts of Laptedenia pyrotechnica
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resulting in a water molecule having a positive charge on the side where the hydrogen atoms are and a negative charge on the other side‚ where the oxygen atom is. This uneven distribution of charge is called polarity. Since opposite electrical charges attract‚ water molecules tend to attract each other‚ making water kind of "sticky." As the right-side diagram shows‚ the side with the hydrogen atoms (positive charge) attracts the oxygen side (negative charge) of a different water molecule. (If the water
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Name Period Date Molecular Geometry – Ch. 9 For each of the following molecules‚ draw the Lewis Diagram and tally up the electron pairs. Then‚ identify the correct the molecular shape and bond angle. molecule lewis diagram e- tally shape bond angle 1. SeO3 2. AsH3 3. NO2 - 4. BeF2 molecule lewis diagram e- tally shape bond angle 5. SiH4 6. SeH2 7. PF5 8. SCl6 Name:
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is written in superscript immediately after the chemical structure for the molecule/atom. The net charge is written with the magnitude before the sign; that is‚ a doubly charged cation is indicated as 2+ instead of +2. However‚ the magnitude of the charge is omitted for singly charged molecules/atoms; for example‚ the sodium cation is indicated as Na+ and not Na1+. An alternative (and acceptable) way of showing a molecule/atom with multiple charges is by drawing out the signs multiple times; this
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