Bonding structure Metals: metallic bonding Ionic compound (metal +nonmetal): ionic bonding Molecule (nonmetal +nonmetal): covalent bonding 3.1 Metallic Bonding 1) Definition The electrostatic attraction between a lattice if positive ions and delocalized electrons. 2) The strength of metallic bonding (depend on) Delocalized electrons (=valence electrons=Group number) More valence electrons‚ stronger metallic bonding Ionic radii (=distance between nucleus and e-) Greater ionic radius
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Lewis Structure Review How To Write Lewis Structures 1. Determine the total number of valence electrons from all of the atoms in the molecule or ion. • Add one electron for each unit of negative charge. • Subtract one electron for each positive charge. 2. Write the correct skeletal structure. • For molecules of the formula ABn‚ place the least electronegative element in the center‚ and the more electronegative elements in the terminal positions. • H is always a terminal atom‚ and NEVER a central
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Office hours 1 Huynh Kim Lam : Dr. Huỳnh Kim Lâm : Ms. Võ Diệu Ánh Dương Ms. Hồ Như Ngọc : Rm. A1.705 : 9:00-11:00 AM‚ Thursday (LKH) Chemistry for Engineers (CH011IU) - Lecture 7 - Semester 1: 2014-2015 huynhkimlam.iu@gmail.com / lamhuynh.info Molecular forces Intramolecular forces (bonding forces) – exist within each molecule – influence the chemical properties of the substance – are relatively strong (larger charges that are closer together) Intermolecular forces (nonbonding forces) – exist
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differs from the next by a common repeating unit‚ CH2 . The members of the series are called homologues. • • • • • • Functional Groups All share the same general formula. Formula of a homologue differs from its neighbour by CH2. (e.g. CH4‚ C2H6‚ . . . etc ) Contain the same functional group(s). Have similar chemical properties. Show a gradual change in physical properties as molar mass increases. Can usually be prepared by similar methods. • Can consist of one atom‚ a group of atoms
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molecules of C2H6 b. 1.00 mol of H2O d. 2 X 1023 molecules of C2H6O2 6. NaOH a. What is the formula for sodium hydroxide? 40.00 g/mol b. What is the formula mass of sodium hydroxide? 10. g c. What is the mass in grams of 0.25 mol of sodium hydroxide? 7. 80% C‚ 20% H What is the percentage composition of ethane gas‚ C2H6‚ to the nearest whole number? 8. C5H10O5 Ribose is an important sugar (part of RNA)‚with a molar mass of 150.15 g/mol. If its empirical formula is CH2O‚ what is its molecular formula
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water. e) A sample of ethanol (C2H5OH) has a mass of 45.6 g.How many carbon atoms does the sample contain?How many hydrogen atoms are present?How many oxygen atoms are present? Percent Composition from Chemical a) What is the percent of C & H in C2H6 ? b) What is the percent of each element in Al2 (SO3)3 ? Empirical Formula a) What is the empirical formula for a compound which is 75 % C and 25 % H? b) What is the empirical formula for a compound which has 48.64 % C‚ 8.16 % H‚ 43.20 % O
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completed before coming to the lab. Molecular Modeling Print this handout and bring it to the lab with you. You do not need to do any prelab work for the molecular modeling part of the lab. Answer these questions in your lab notebook in the post lab question section of your lab report. You may work together to build the models. There are many organic substances that have identical molecular formulas but are completely different compounds. Consider the molecular formula C2H6O. There are two compounds
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possible. • In molecules with one or multiple carbons‚ each carbon bonded by one covalent bond to four other atoms results in a tetrahedral shape. CH4‚ methane • However‚ when two carbon atoms are joined by a double bond‚ the atoms joined to the carbons are in the same plane as the carbons. Name and Comment Molecular Formula (a) Methane CH4 (b) Ethane C2H6 (c) Ethene (ethylene) C2H4 Structural Formula Ball-andStick Model Space-Filling Model • The electron configuration of carbon gives it
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lab you are culturing human cells in order for the cells to survive they must be cultured in a solution containing 25 mM glucose. You must make 500 ml of this solution. First‚ calculate the molecular weight of glucose given that its molecular formula is C6H12O6 (C=12g/mol‚ H=1g/mol‚ O=16 g/mol). The molecular weight of glucose is: 180 g/mol How many grams of glucose should you weigh out and add to 500 ml to make a 25 mM solution 2.25 g Your final solution has a [H+] = 3.98x10^-8 what is the
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Honors Chemistry Final Exam Study Guide Multiple Choice- (51 points @ 1/2 point ea.) Identify the letter of the choice that best completes the statement or answers the question. ____ 1. The pair of elements that forms a bond with the least ionic character is |a. |Na and Cl. |c. |O and Cl. | |b. |K and Cl. |d. |Mg and Cl.
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