Structures 29 Use with Chapter 8‚ Section 8.3 1. Step 1 in drawing the Lewis structure for a molecule is to decide which atoms of the molecule are most likely the terminal ones. In the transparency‚ why are the hydrogen (H) atoms in hydrazine (N2H4) shown as the terminal atoms? 2. Step 2 in drawing a Lewis structure involves determining the total number of valence electrons in the atoms in the molecule. Explain why the total number of valence electrons in N2H4 is 14. 3. Step 3 in drawing a
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POLAR-The opposite ends of the molecule have opposite charges **attraction between polar molecules **hydrogen bonding orders molecules into structural organization Non-Polar-Substances that are hydrophobic/water fearing. They do not dissolve well and cannot bond. They share electrons perfectly‚ therefore have no difference in charge. Ex: oil‚ gum‚ wax‚ sand‚ plastic. Adhesion-Something’s ability to stick to other molecules Cohesion- The ability of the molecules to bond to themselves. (hydrogen
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carbons +1.008x12 hydrogens + 16= 148.09 09 g mol -1. From this knowledge the unknown molecule must include either an alcohol‚ aldehyde‚ ketone‚ ether or methoxy- functional group. Secondly it is important to calculate the degrees of unsaturation in the molecule. The degrees of unsaturation
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Here‚ the ammonium nitrate compound absorbs heat from the water molecules in order to dissolve into ions of ammonium and nitrate. This absorption of heat is what causes the ice pack to get cold. This is the opposite of an exothermic reaction‚ in which heat is released from the system rather than absorbed. The chemical reaction that takes place in cold packs is also a decomposition reaction‚ as the heat causes the ammonium nitrate molecule to decompose into ions‚ thus making ammonium nitrate soluble
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properties are often superior to those of their component elements. 8.1-Molecular Compounds Molecular compounds tend to have relatively lower melting and boiling points than ionic compounds. A molecular formula shows how many atoms of each element a molecule contains. 8.2-Covalent Bonding In covalent bonds‚ electron sharing usually occurs so that atoms attain the electron configurations of noble gases. An electron dot structure such as H:H represents the shared pair of electrons of the covalent bond
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chemistry is a branch of chemistry that uses principles of computer science to assist in solving chemical problems. It uses the results of theoretical chemistry‚ incorporated into efficient computer programs‚ to calculate the structures and properties of molecules and solids. Its necessity arises from the well-known fact that apart from relatively recent results concerning the hydrogen molecular ion (see references therein for more details)‚ the quantum many-body problem cannot be solved analytically‚ much
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Lab BCH 2333 Section: Lab 1 Carbohydrates: Separation Techniques Based on Molecular Size TA: Wednesday‚ January 16th‚ 2013 Team #4 By: Partner: Purpose The purpose of this experiment is to exemplify how differences in molecular weight allow separation of polymers from their monomers. Methods of dialysis and gel filtration chromatography will be used to separate a glucose monomer from a starch polymer. Colorimetric
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and bonding of molecules that are used in creating small scale electronic components for products such as computers. Scientists have succeeded in imaging and forming a unique bond between a single gold atom and a single organic molecule called a pentacene. They managed to bind the atom to the pentacene and take images of rearrangements of the electrons participating in the formation of the chemical bond. The pentacene has been selected as it is a special class of molecule that has qualities
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348 299 240 413 A) -63 B) -217 C) +160 D) -160 E) +63 9. The molecular geometry of the CS2 molecule is __________. A) trigonal planar B) bent C) T-shaped D) linear E) tetrahedral 10. The molecular geometry of the PF4+ ion is __________. A) trigonal planar B) trigonal bipyramidal C) tetrahedral D) trigonal pyramidal E) octahedral 11. The Cl-Si-Cl bond angle in the SiCl2F2 molecule is approximately __________. A) 90° B) 109.5° C) 180° D) 60° E) 120° 12. The O-S-O bond angle
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contain equal numbers of molecules. He also figured out that relative molecular weights of any two gases are similar to the ratio of the densities of the two gases under the constant conditions of temperature and pressure. This is now known as the Avogadro’s Principle. He also figured out that simple gases were not single atoms but were compound molecules of two or more atoms. In 1811‚ the words atom and molecule meant the same thing. He talked about three kinds of “molecules‚” including an “elementary
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