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. SO2 trigonal planar<br />
c. NH2- tetrahedral<br />
d. NH3 tetrahedral<br />
e. BH4- trigonal planar<br />
____ 216. Which one of the following molecules has a central atom that is not sp 3 hybridized?<br />
a. H2O<br />
b. NH3<br />
c. CH4<br />
d. CHCl3<br />
e. SF4<br />
____ 217. Which species is incorrectly matched with bond angles?<br />
Molecule Bond Angles<br />
a. CI4 109.5°<br />
b. BeF2 180°<br />
c. HI 90°<br />
d. I3 - 180°<br />
e. BI3 120°<br />
____ 218. Which response contains all the covalent molecules below that are polar, and no others?<br />
I. CCl4<br />
II. HBr<br />
III. N2<br />
IV. C2H6<br />
V. H2S<br />
a. II, III, and IV<br />
b. I and II<br />
c. III, IV, and V<br />
d. II and V<br />
e. I, III, and V<br />
____ 219. Which one of the following is the most polar molecule?<br />
Electronegativities: H = 2.1, Be = 1.5, B = 2.0, F = 4.0, S = 2.5, Cl = 3.0, Te = 2.1, P = 2.1)<br />
a. BF3<br />
b. H2S<br />
c. BeCl2<br />
d. H2Te<br />
e. PF5<br />
____ 220. Which one of the following statements about nuclear reactions does not correctly distinguish nuclear<br />
reactions from ordinary chemical reactions?<br />
a. Particles within the nucleus are involved.<br />
b. No new elements can be produced.<br />
c. Rate of reaction is independent of the presence of a catalyst.<br />
d. Rate of reaction is independent of temperature.
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