Chemistry Unit 3

Chapters 7-9: Chemical Composition Intra-chemical Forces Intra = within Atoms (elements) held together by an attractive force Metallic Bonding atoms of a metal share the valence electrons because they move from one element to another

Ionic Bonding valence electrons are transferred between two elements strongest bonds Covalent Bonding valence electrons

are shared between two elements Weaker bonds than ionic bonds Ionic Bonding Electrons are transferred from one element to another.

Ionic Bonding Opposite charges is attractive force Commonly referred to as salts Atoms that donates electron = cation Atom that accepts electron = anion Oxidation state refers to the charge of an atom

Lewis Dot Formulas Octet Rule: every element wants 8 electrons in its outer shell. a) potassium + chlorine potassium chloride b) magnesium + fluorine magnesium fluoride Types of Ions

monatomic cation: cation with one element K+ Mg2+ Fe3+ Fe2+ Mn7+ Au3+ Au+ monatomic anion: anion with one element name ends in ide Cl O2 N3 S2

F P3 Br polyatomic ion: many atoms covalently bonded that have a net charge. NO3 SO42 C2H3O2 PO43 NH4+

Writing Ionic Chemical Formulas 1. 2. 3. 4. 5. 6. Composition number of elements Writing chemical formulas (from the names)

Recognize the (+) and () ions Write the symbols of the elements with their charge A Roman numeral will tell you what the charge is on the cation if there is more than one possibility 7. Adjust the number of each ion (with subscripts) as needed so the positive charge is equal and opposite the negative charge. 8. If the ions are polyatomic and there is more than one, the ion is enclosed with parentheses with a subscript on the outside.

Writing Ionic Chemical Formulas 1. sodium chloride 2. calcium sulfide 3. calcium sulfate 4. barium phosphate Naming Ionic Compounds a) Consists of two words:

b) Name the cation c) Name the anion d) If the cation has more than one possible charge, a Roman Numeral is used to show the charge. e) All transition metals need roman numerals except: i. Zinc always has a charge of +2 ii. Silver always has a charge of +1 Naming Ionic Compounds

1. FeCl3 Fe3+ iron(III) chloride 2. FeCl2 Fe2+ iron(II) chloride 3. NH4Cl 4. Cu2SO4 5. NaC2H3O2

6. Ca(NO3)2 7. Zn(ClO)2 8. Cu2O Naming Ionic Compounds 1. FeCl3 Fe3+ iron(III) chloride 2. FeCl2

Fe2+ iron(II) chloride 3. NH4Cl ammonium chloride 4. Cu2SO4 copper (I) sulfate 5. NaC2H3O2

sodium acetate 6. Ca(NO3)2 calcium nitrate 7. Zn(ClO)2 zinc hypochlorite

8. Cu2O copper (I) oxide Covalent Bonding A.Valence electrons are shared between two elements B.Weaker than ionic bonding polar & nonpolar covalent bonds Polar Covalent (stronger): unequal

sharing of electrons (the more electronegative element pulls more) Nonpolar Covalent (weaker): equal sharing of electrons Writing Formulas for Covalent Compounds 1. carbon dioxide 2. carbon monoxide 3. dinitrogen monoxide 4. carbon tetrafluoride

5. triphosphorus pentachloride Naming Formulas for Covalent Compounds Binary covalent compounds (2 elements) Formulas with two nonmetals Rules: i. First word: 1. prefix indicating the number of atoms for the first element (if there is more than one) 2. name of first element

ii. Second word: 1. prefix for the number of atoms of the second element (prefixes on supplement notes sheet) 2. name of second element 3. suffix ide Naming Formulas for Covalent Compounds 1. NO 2. NO2 3. CBr4

4. P4O10 5. BF3 6. SiI5 7. H2O 8. S6Cl8 Naming Formulas for Covalent Compounds 1. NO 2. NO2

nitrogen monoxide nitrogen dioxide 3. CBr4 carbon tetrabromide 4. P4O10 tetraphosphorus decoxide

5. BF3 boron trifluoride 6. SiI5 silicon pentaiodide 7. H2O dihydrogen monoxide

8. S6Cl8 hexasulfur octochloride Lewis Structures The number of covalent bonds formed by an atom equals the number of unpaired electrons in the Lewis Dot Formula. i. water (H2O)

Lewis Structures ii. Hydrogen gas (H2) iii. Hydrochloric acid (HCl) Lewis Structures iv. ammonia (NH3) v. methane (CH4) Multiple Bonds

i. double bonds: two pairs of electrons shared O2 ii. triple bonds: three pairs of electrons shared N2 Hybridization Combining of two or more orbitals of nearly the same energy into new orbitals of equal energy

Hybridization Most common hybridizations occur in groups 2, 13, 14 (IIA, IIIA, IVA) Group 2 (IIA): Beryllium: [He]2s2 sp hybrid Hybridization Most common hybridizations occur in groups 2, 13, 14 (IIA,

IIIA, IVA) Group 13 (IIIA): Boron: [He]2s22p1 sp2 hybrid Hybridization Most common hybridizations occur in groups 2, 13, 14 (IIA, IIIA, IVA)

Group 14 (IVA): Carbon: [He]2s22p2 sp3 hybrid Molecular Polarity Molecules with more than one element (polar or nonpolar) depends on: i. electronegativity

difference (2 elements) ii. Non-bonded electron pairs (2+ elements) Inter-chemical forces A. Inter = between B. Whole salts or molecules attract and bond with one another

Inter-chemical forces 1. Ion dipole 2. Hydrogen Bonding 1. Dipole Dipole 2. London Dispersion Ion Dipole forces

Strongest interchemical force hydrogen bonding hydrogen bonding is a unique case of dipole dipole bonding occurs because hydrogens

exposed proton results in a slight hydrogen bonding medium strength inter-chemical bond. occurs in molecules when hydrogen is bonded with F, O, or N.

hydrogen bonding hydrogen bonding is responsible for: waters high boiling point, and the low density of ice

dipole dipole bonding weaker than hydrogen bonding. occurs between polar molecules London Dispersion Forces named after Fritz London the weakest intermolecular force the random movement of electrons can

create an instantaneous dipoles

Recently Viewed Presentations

  • Children's Literature

    Children's Literature

    Tips for picking books for preschoolers Find books that they can relate to. Read stories with simple plots. Folk tales and books with animals that act like humans are popular. Little children like rhyming books. Pick books that are interesting...
  • Title IX: Pregnancy

    Title IX: Pregnancy

    Title IX of the Education Amendments Act of 1972 "No person in the United States shall, on the basis of . sex, be excluded from participation in, be denied the benefits of, or be subjected to discrimination under any education...
  • Money - Wattsburg Area School District

    Money - Wattsburg Area School District

    Role of Money. Complete the worksheet provided. Use your textbook pages 210 - 215 as a resource. ... What are the three uses of Money? What are the 6 characteristics of Money? "Ours is the worst possible system, except for...
  • PowerPoint - Tourism Sales and Distribution

    PowerPoint - Tourism Sales and Distribution

    Rail Travel - Travel by rail is also sold like other travel suppliers, direct and indirect. In the U.S., Amtrak is the corporation that handles most long-distance passenger service. In Canada, the company is called VIA Rail Canada. Many rail...
  • Graphing Quadratic Functions - Miami Arts Charter

    Graphing Quadratic Functions - Miami Arts Charter

    Then connect the five points with a smooth curve. y x 3 2 y x Graphing a Quadratic Function y x Y-intercept of a Quadratic Function Y-axis The y-intercept of a Quadratic function can Be found when x = 0....
  • Sponsorship Proposal Team Building Workplace Fitness Socializing and

    Sponsorship Proposal Team Building Workplace Fitness Socializing and

    Deliverable Details. Networking and Data Base. Sponsor Lunch - 2-3 months before event, CFR will host a sponsor only lunch near host venue to enable sponsors to get to know each other in an intimate setting.. Email Introductions - CFR...
  • January 2006 doc.:15-06-0176-00-0005 Project: IEEE P802.15 Working Group

    January 2006 doc.:15-06-0176-00-0005 Project: IEEE P802.15 Working Group

    Editing Team: Hui-Rong Shao (TG5 Editor), Chunhui Zhu, Michael Sim, Sebastian Max, James Allen (Chief Editor for WG15) Ad hoc meetings as needed for the editing team . <month year> Myung Lee doc.: IEEE 802.15-<doc#> <author>, <company> TG5 WPAN Mesh...
  • High School versus College: A Comparison of What to Expect

    High School versus College: A Comparison of What to Expect

    Budgeting Vocabulary. Budget - a plan based on itemized estimates of expected income and expenses for a given period of time. Income - monetary payment received for goods, services, or from other sources. Expenses - costs or charges for items...