QUIZ 1. If there are n carbon atoms on an alkane, how many hydrogen atoms are there on the molecule? a. 2n b. 2n + 2 c. 2n + 4 d. 3n Answer: b. If there are n carbon atoms, there will be 2n + 2 hydrogen atoms on the alkane. This best indicates a completely saturated hydrocarbon molecule. 2. What can be said specifically about n-hexane as opposed to other types of hexane? a. It doesn’t have a double bond while other types of hexanes do. b. It is branched, while other types of hexanes are not branched. c. It is not branched, while other types of hexanes are branched. d. It is much more combustible than other forms of hexane. Answer: c. The n in front of the alkane, as in n-hexane, means it isn’t branched, while other forms of the alkane are possibly branched. 3. A carbon atom with four CH3 molecules attached to it is called what? a. Isobutane b. Tert-pentane c. Sec-butane d. Neopentane Answer: d. Neopentane is a carbon atom with four CH3 molecules attached to it. It is a cross-shaped molecule that has a total of 5 carbon atoms but an unusual shape.
71
