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d. CrO3<br />
e. SnO<br />
____ 171. Write the balanced formula unit equation for the reaction of the complete combustion of pentane, C5H12.<br />
What is the sum of the coefficients?<br />
a. 16<br />
b. 19<br />
c. 20<br />
d. 21<br />
e. 22<br />
____ 172. Combustion of fossil fuels and the roasting of metal ores often both produce oxides of<br />
a. P<br />
b. N<br />
c. S<br />
d. Si<br />
e. C<br />
____ 173. The brownish color of photochemical smog is due to __________.<br />
a. CO<br />
b. NO2<br />
c. NO<br />
d. SO2<br />
e. SO3<br />
____ 174. Combustion of fossil fuels contaminated with sulfur leads to what phenomena?<br />
a. greenhouse effect<br />
b. global warming<br />
c. ozone destruction<br />
d. photochemical smog<br />
e. acid rain<br />
____ 175. The two acids that are major contributors to "acid rain" are __________.<br />
a. H2CO3 and HNO3<br />
b. H2SO4 and H3PO4<br />
c. H2CO3 and H2SO4<br />
d. H2SO4 and HNO3<br />
e. H3PO4 and HNO3<br />
____ 176. Which of the following statements about ionic and covalent compounds is false?<br />
a. Electrons are shared in covalent compounds.<br />
b. Covalent compounds are usually poor conductors of electricity.<br />
c. Many ionic compounds are soluble in water.<br />
d. Covalent compounds commonly exist as gases, liquids or solids.<br />
e. Ionic compounds have low melting points.<br />
____ 177. Which Lewis Dot Formula below is incorrect?<br />
a.<br />
b.<br />
c.<br />
d.
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