Section 9.5
The tendency of an atom to attract highest electronegativity electrons
2.Which element has the? What is the numerical value? What are the name and group number of the chemical family that has the highest overall electronegativity?
Fluorine; F; 3.98; halogens; group 7A
3. Which element has the lowest electronegativity? What is the numerical value? What are the name and group number of the chemical family that has the lowest overall electronegativity
Francine; 0.7; alkaline metals; group 1A
4. What general tend in electronegativity do you note going down a group? Across a period?
Decreasing – increasing
5. How are the electronegativity values used to determine the type of bond that exists between two atoms?
Electrons are subtracted.
6. Ionic compounds are usually soluble in polar substances- True
7. In a covalent molecular compound, the attraction between molecules tends to be strong- False
8. Unequal sharing of electrons between two bonded atoms always indicates
c. A polar covalent bond
9. When electronegativity of two bonded atoms differ greatly, the bond is
d. ionic
10. What is the electronegativity difference that usually is the dividing line between covalent and ionic bonds
b. 1.7
11. The Symbol δ is placed next to which of the following
a. The less electronegativity atom in a polar covalent bond
12. A nonpolar covalent bond is one in which
c. Electrons are shared equally.
13. Molecules containing only polar covalent bonds
b. May or May not be polar
14. What factor other than electronegativity determines whether a molecule as a whole is polar or not?
b. its geometry
15. Which of the following correctly describes the compound water, H2O?
d. Polar overall, which polar covalent bonds
16. Which of the following correctly describes the compound carbon tetrachloride, CCl4?
a. Nonpolar overall, with polar covalent bonds
17. A molecule of ammonia, NH3, is
d. polar because there is an electronegativity difference and the molecule is trigonal pyramidal.
No comments:
Post a Comment