The long, nonpolar hydrocarbon tail embeds itself in a person's oily skin, where the molecule initiates an allergic response
Scratching the itch spreads tetrahydrourushiol molecules over a greater surface area, causing the zone of irritation to grow. Is this compound an alcohol or a phenol?
A) an alcohol because of the hydroxyl groups it contains
B) both a phenol and an alcohol because of the hydroxyl groups it contains
C) a phenol because of the hydroxyl groups attached to the benzene ring
D) neither an alcohol or phenol because it contains two hydroxyl groups instead of one
Answer: C
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Which of the following statements correctly explains why galaxy collisions should have been more common in the past than they are today?
A) Galaxies were closer together in the past, because the universe was smaller. B) Galaxies were more active in the past and therefore would have collided with each other more frequently. C) Galaxies were much bigger in the past, because they had not contracted completely. D) Galaxies attracted each other more strongly in the past, because they had not yet turned most of their mass into stars.
Pianos are usually strung with multiple identical wires sounding each note. If two wires that each are meant to have a fundamental frequency of 283.5 Hz are played, and a beat frequency of 1.5 Hz is heard, by what fraction must the string which is lower in frequency than the other have its tension adjusted?
A. 0.27% B. 0.53% C. Impossible to determine D. 1.1%
Sometimes on a hot day a distant dry street appears wet, which is due to
A) water from a previous rainfall. B) reflection of the sky from the street. C) refracted sky light.
Of all the terrestrial and Jovian worlds, Jupiter has the largest magnetic field and thus the largest magnetosphere
a. True b. False Indicate whether the statement is true or false