Name:_______________________________________
Date:_____________
Chapter 9
Guided Reader- Honors Chemistry
Directions: Please answer the questions to the guided reading activity as you read chapter 9 of your
textbook. A word of advice: write page numbers by your answers so you can reference them later.
1. Molecules have shapes and sizes that are defined by the ________ and distances between the
_________ of their component atoms.
2. The shape of a molecule affects its ________, since the nose has receptor sites into which the
molecule may fit and send impulses to the brain.
3. The overall shape of a molecule is determined by its ________________.
4. Molecules with single central atoms conform to the general formula of ABn. What does this mean?
5. The shape of ABn molecules depends on the value of _____.
6. How many possible shapes are there for AB2 molecules? Name them.
7. How many possible shapes are there for AB3 molecules? Name them.
8. A ___________________ of electrons defines a region in which the electrons will most likely be
found.
9. A ______________________, also known as ___________________ of electrons defines an
electron domain that is located principally on one atom.
10. How many bonding pairs of electrons are around the central atom in a molecule of ammonia?
11. How many nonbonding pairs of electrons are around the central atom in a molecule of ammonia?
12. How many electron domains does are around the central atom in a molecule of ammonia?
13. A multiple bond in a molecule constitutes a __________ electron domain.
14. List the three things that can produce an electron domain around the central atom.
15. What is the best arrangement of a given number of electron domains?
16. Complete the following table:
# of electron domains
2
3
4
5
6
Electron-domain geometry
Predicted bond angle
17. What is the difference between electron-domain geometry and molecular geometry?
18. When all electron domains in a molecule arise from bonds, the molecular geometry is
_____________ to the electron-domain geometry.
19. Complete the table below:
# of electron
domains
2
Electron-domain
geometry
Bonding domains
Nonbonding
domains
Molecular
geometry
3
4
5
6
20. Bond angle decreases/increases as the number of nonbonding electron pairs increases. CIRCLE 1
21. Electron domains for nonbonding electron pairs exert greater _____________________ on
adjacent electron domains and thus tend to ________________ the bond angles.
22. Multiple bonds represent ___________ electron domains.
23. Electron domains for multiple bonds exert a greater ________________________ on adjacent
electron domains than do electron domains for __________________________.
24. For larger molecules with more than one central atom, we can use the VSEPR model to
predict___________________________________________________________________.
25. What is bond polarity?
26. The dipole moment depends on both the __________________ of the individual bonds and the
______________ of the molecule.
27. Both the _______________ and the ________________ of the dipoles must be considered when
summing vectors.
28. Molecules in which the central atom is symmetrically surrounded by identical atoms are
___________.
29. For all ABn molecules in which all the B atoms are the same, list the shapes that must lead to
nonpolar molecules even though the individual bonds might be polar.