Draw a perspective formula for each of the following: a. (S)-2-chlorobutane b. (R)-1,2-dibromobutane

Assign relative priorities to the groups or atoms in each of the following sets:

$$\begin{array}{llll}\text { a. }-\mathrm{CH}_2 \mathrm{OH} & -\mathrm{CH}_3 & -\mathrm{H} & -\mathrm{CH}_2 \mathrm{CH}_2 \\ \text { b. }-\mathrm{CH}_2 \mathrm{Br} & -\mathrm{OH} & -\mathrm{CH}_3 & -\mathrm{CH}_2 \mathrm{OH}\end{array}$$

c. $-\mathrm{CH}\left(\mathrm{CH}_3\right)_2 \quad-\mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br} \quad-\mathrm{CI} \quad-\mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}$

Which of the compounds in Problem 14 can exist as enantiomers?

Tetracycline is called a broad-spectrum antibiotic because it is active against a wide variety of bacteria. How many asymmetric centers does tetracycline have ?

Which of the following objects are chiral? a. a wheelbarrow b. a shoe c. a nail d. a screw

Draw the structure of $(Z)$-2,3-dimethyl-3-heptene.

Draw skeletal structures for each pair of isomers in the previous problem.

a. Draw three constitutional isomers with molecular formula $\mathrm{C}_3 \mathrm{H}_8 \mathrm{O}$. b. How many constitutional isomers can you draw for $\mathrm{C}_4 \mathrm{H}_{10} \mathrm{O}$ ?

A mass on a spring bounces up and down in simple harmonic motion, modeled by the function s(t) = -6 cost where s is measured in inches and t is measured in seconds. Find the rate at which the spring is oscillating at t = 5 s.

One of the chair conformers of cis-1,3-dimethylcyclohexane is 5.4 kcal/mol less stable than the other. How much steric strain does a 1,3-diaxial interaction between two methyl groups introduce into the conformer?

Which has a higher percentage of the diequatorial-substituted conformer compared with the diaxialsubstituted conformer: trans-1,4-dimethylcyclohexane or cis-1-tert-butyl-3-methylcyclohexane?

Which of the following is NOT a renewable resources? (A) wind (B) sunlight (C) water (D) fossil fuels (E) trees

In 1668, Francesco Redi proposed a different hypothesis to explain the specific example of maggots that appear on spoiled food. He had observed that maggots appear on meat a few days after flies have been seen on the food. He inferred that the flies had left behind eggs too small to see. Redi's experiment is shown below. What conclusion can you draw from Redi's experiment?

Carbon dioxide in the atmosphere dissolves in raindrops to produce ca rbonic acid

$$(H_2CO_3)$$

causing the pH of clean, unpolluted rain to range from about 5.2 to 5.6. What are the ranges of

$$[H^+]$$

and

$$[OH^-]$$

in the raindrops?