electrical/heat conductors) Bonding in solids: Ionic solids Ionic solid crystals (e.g. NaCl) are held together by the Coulomb attractive interaction between ions with opposite sign (ionic bonding) e2 b U = −αk + m r r (α = 1.7476 for Na +Cl − ) (m ~ 10) k = 1 / 4πε 0 Madelung constant Ionic cohesive energy: 11 U0 = min U (r ) = −αk 1 − m r0 mb r0 = αk 1 m −1 Bonding in solids: Ionic solids Properties of ionic solid crystals: • relatively stable and hard
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Chemistry‚ 2014 UNIT 1 – MATTER TRENDS AND CHEMICAL BONDING History of the atom DEMOCRITUS Smallest particle of matter is called an atom Atoms are in constant motion and have empty space between them ARISTOTLE 4 element theory of matter (earth‚ air‚ water‚ fire) Had different combinations of the 4 qualities: hot‚ cold‚ dry‚ moist JOHN DALTON Expanded on Democritus’s theory: All matter is composed of tiny‚ indivisible particles All atoms of an element have identical properties
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Molecule Polarity PhET Lab A study of electronegativity‚ bond polarity‚ and molecular polarity Introduction: In this atomic-level simulation‚ you will investigate how atoms’ electronegativity value affects the bonds they produce. When two atoms bond‚ a pair of electrons is shared between atoms. Electronegativity is a measure of a single atom’s ability to hoard electrons shared in that bond. In this lab you will work diligently‚ at your own pace‚ to answer a number of questions. To begin‚ from
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electrostatic forces between the sea of valence electrons and the positively charged nucleus. Malleability and Ductility Because metallic bonding is non-directional-meaning that the bonds don’t have to exist with a set pair of particles‚ means that the positive nucleuses can easily slip over each other with bonds being broken. Conductivity of electricity Conductivity of electricity requires two things‚ charged particles and they have to be freely moving. Metals have free-moving electrons‚ therefore
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Abacus Inc. has asked you price a 5 year bullet bond issue for them‚ with Price‚ Yield to Maturity and Modified Duration. There are no comparable existing issues in the secondary market either by Abacus or a competitor and so you will need to price the issue from scratch. You have the following set of US Treasury bond data and consultations with your Bank Equity Analyst and Debt Analyst suggest that a Z-spread for Abacus of 200 bps over Treasuries and a coupon rate of 6.5% should be appropriate
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charge of each? 3. Distinguish between anions and cations. 4. What are the four major chemical elements of the body? 5. Distinguish between an ionic and a covalent chemical bond. 6. Define electronegativity. 7. Describe how polar covalent bonds are formed and how electrical charges are distributed in them. 8. Describe how nonpolar covalent bonds are formed and how electrical charges are shared in them. 9.
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Ionic Bonding Puzzle Lab Introduction When metals and non-metals chemically react‚ the atoms will tend to form ions or charged atoms. Ions form because electrons are either gained or lost. Metals will generally form cations or positive ions‚ since they tend to donate electrons Non-metals will form anions or negative ions‚ since they tend to accept electrons. Activity In this activity you will create models of ionic compounds and observe the chemical formula of the binary molecules you
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Name: __________________________________ Teacher: ________________________________ DO NOT OPEN THE EXAMINATION PAPER UNTIL YOU ARE TOLD BY THE SUPERVISOR TO BEGIN Chemistry 2202 FINAL EXAMINATION June 2010 Value: 100% General Instructions This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I – Multiple Choice (40%) Select the letter of the correct response from those provided. EITHER
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electron configuration of the ion to determine which ion shown below has an incorrect ionic charge? A.Se2- B.Ba2+ C.Al3- D.Rb+ E.none of the above Answer Key: C Part 2 of 8 - 4.0/ 6.0 Points Question 4 of 23 0.0/ 2.0 Points The correct Lewis structure for BF3 would have exactly: A.1 double bond. B.no double bonds. C.2 double bonds. D.1 triple bond. E.none of the above Answer Key: B Question 5 of 23 2.0/ 2.0 Points
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Words: 893 Recently‚ one of my good friend has inherited ￡20‚000 and wants to invest this amount of money in financial market‚ in other words‚ she is planning to buy some financial products such as equities‚ bonds and currencies. She has asked me for some guidance. In my opinion‚ I think diversifying portfolio would be the best way to get a higher return. In this essay‚ I will explain the concept and benefits of diversification in financial markets. However‚ even with a diversified portfolio of
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