(three marks) The molecular formula for heptane is\ a.

C_(7)H_(12)

\ b.

C_(7)H_(16)

\ d.

C_(6)H_(12)

\ c.

C_(6)H_(14)

\ e.

C_(7)H_(18)

\ (three marks) A complex mixture of hundreds of thousands of compounds, most of which are hydrocarbons\ with one to 40-carbon atoms per molecule is\ a. crude oil\ d. organic compounds\ b. petroleum\ e. none of the above\ c. natural gas\ (three marks) The main concern over the increasing concentration of carbon dioxide in the atmosphere is\ a. loss of oxygen\ d. global warming\ b. decreased plant growth\ e. global cooling\ c. increase in rainfall\ (three marks) Which of the following could be produced during incomplete combustion?\ a. water vapour\ d. carbon\ b. carbon dioxide\ e. all of the above\ c. carbon monoxide\ (three marks) During fractional distillation, which of the following chemicals would come out at the top of\ the tower?\ a. octane\ d. ethane\ b. coal tar\ e. kerosene\ c. wax

Instructione. 6. (three marks) The molecular formula for heptane is a. C7H12 d. C6H12 b. C7H16 e. C7H18 c. C6H14 7. (three marks) A complex mixture of hundreds of thousands of compounds, most of which are hydrocarbons with one to 40 -carbon atoms per molecule is a. crude oil d. organic compounds b. petroleum e. none of the above c. natural gas 8. (three marks) The main concern over the increasing concentration of carbon dioxide in the atmosphere is a. loss of oxygen d. global warming b. decreased plant growth e. global cooling c. increase in rainfall 9. (three marks) Which of the following could be produced during incomplete combustion? a. water vapour d. carbon b. carbon dioxide e. all of the above c. carbon monoxide 10. (three marks) During fractional distillation, which of the following chemicals would come out at the top of the tower? d. ethane a. octane e. kerosene b. coal tar c. wax Page 4