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Test 4 Review

Test 4 Review. Naming Formulas Percent composition Empirical formulas Balancing Equations Types of Reactions Activity Series. Molecular Compounds. A molecule is held together by covalent bonds . Valence electrons are shared . Between non-metals i.e. H 2 O, CO 2 , O 2 , NO.

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Test 4 Review

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  1. Test 4 Review • Naming Formulas • Percent composition • Empirical formulas • Balancing Equations • Types of Reactions • Activity Series

  2. Molecular Compounds • A molecule is held together by covalent bonds. • Valence electrons are shared. • Between non-metals i.e. H2O, CO2, O2, NO

  3. Naming molecular compounds • Use prefixes 1 mono- 2 di- 3 tri- 4 tetra- 5 penta- 6 hexa- 7 hepta- 8 octa- 9 nona- 10 deca-

  4. Naming molecular compounds • Use prefixes 1 mono- 2 di- 3 tri- 4 tetra- 5 penta- 6 hexa- 7 hepta- 8 octa- 9 nona- 10 deca-

  5. Percent Composition • Determine the mass percentage of each element in the compound. Mass of elementx 100% mass of compound What is the percent composition of Fe2O3? 2 Fe 2 x 55.8 = 111.6 3 O 3 x 16.0 = 48.0 Formula mass 159.6 %Fe = 111.6/159.6 = 70.0% % O = 48.0/159.6 = 30.0%

  6. Calculating Molecular Formula X (empirical formula) = molecular formula so x = molecular formula mass empirical formula mass

  7. What is the molecular formula of the molecule that has an empirical formula of CH2O and a molar mass of 120.12 g/mol? Empirical formula mass: 12.0 + 2.0 + 16.0 = 30.0 amu X = 120.12 amu = 4 30.0 amu So C4H8O4 is the molecular formula.

  8. Determining empirical formula • Find the empirical formula of a compound that contains 53.7% iron and 46.3% sulfur. • % composition g mass of 100 g sample g moles g mole ratio • 53.7g x 1 mol/55.8g = .962 mol Fe 46.3g x 1 mol/32.1g = 1.44 mol S .962/.962 = 1, 1.44/.962 = 1.5 1:1.5 ratio x 2 = 2:3 ratio Fe2S3

  9. Diatomic Molecules • “Honkle Brif” • H2 • O2 • N2 • Cl2 • Br2 • I2 • F2

  10. Symbols • Yields • Gas (g) • Precipitate • Solid (s) or down arrow • Liquid (l) • Aqueous (aq)

  11. Types of Reactions • Balancing Equations • Synthesis (Combination) • Decomposition • Single Displacement (Replacement) • Double Displacement (Replacement) • Neutralization • Combustion

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