Bonding Unit - Oakland Schools

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The plain toothpicks represent bonding electron pairs. Colored toothpicks represent lone pairs. 4. Why do we position the ends of the toothpicks as far apart as possible? The toothpicks represent electrons, and electrons are negatively charged and therefore repel each other. To minimize electron pair interactions, we position the toothpicks as far apart as possible. 5. Can we use the molecular formula to predict the shape of a molecule? Explain. We cannot use a molecular formula to predict the shape of small molecules. We need to also know how many lone pairs of electrons are present (from the Lewis structure) to determine the shape. 6. By looking at the geometry of a molecule, how can you determine if it is polar or nonpolar? Polarity is determined by the symmetry of the molecule. To determine symmetry, look at the atoms and the lone pairs on the central atom. If there are any lone pairs of electrons on the central atom, the molecule is polar. If the molecule has the same atoms around the central atom, then it is nonpolar. See the next page for the answer key to the chart students fill out during the lab activity.
Molecule Total number of atoms and lone pairs of electrons around central atom Number of atoms around central atom Number of lone pairs of electrons around central atom Molecular Shapes Polarity HCN 2 2 0 Linear Polar O 3 3 2 1 Bent Polar CCl 2 H 2 4 4 0 Tetrahedral Polar H 2 CO 3 3 0 Trigonal planar Polar H 2 S 4 2 2 Bent Polar PH 3 4 3 1 Trigonal pyramid Polar CO 2 2 2 0 Linear Nonpolar SF 6 6 6 0 Octahedral Nonpolar
Page 1 and 2: Oakland Schools Chemistry Resource
Page 3 and 4: Background Information: An easy way
Page 5 and 6: Drawing Lewis Structures for Covale
Page 7 and 8: Changes in Potential Energy in the
Page 9 and 10: Websites and Resources for Bonding
Page 11 and 12: the metal is pictured as an array o
Page 13 and 14: Name of Alloy Composition by Mass E
Page 15 and 16: Follow-Up Questions 1. What metal m
Page 17 and 18: Real-World Connections Ideas behind
Page 19: Teacher Notes: Build - A - Molecule
Page 23 and 24: Procedure You will conduct tests on
Page 25 and 26: Bonding Unit Activity #4: Molecular
Page 27 and 28: Procedure 1. Before entering the la
Page 29 and 30: Analysis and Conclusion Questions 1
Page 31 and 32: Station Directions Station 1: Bendi
Page 33 and 34: Station 8: Penny Stacker 1. Place t
Page 35 and 36: Station 3: Mini Lava Lamps 1. After
Page 37 and 38: Station 7: Stain Remover 1. Which s
Page 39: Questions to answer Use the cartoon
Page 45 and 46: Bonding Unit Bond Length and Streng
Page 47 and 48: FIGURE 2
Page 49 and 50: Electronegativity Chart
Page 51 and 52: Bonding Unit Worksheet: Lewis Struc
Page 53 and 54: Answer Key: Lewis Structures, VSEPR
Page 55 and 56: Worksheet: Creative Compounds 1) Li

Bonding Unit - Oakland Schools

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