Which isotope ratio is especially important in studying Earth's climate over the past 500,000 years?
a. oxygen-18 to oxygen-16
b. carbon-14 to carbon-12
c. sulfur-34 to sulfur-32
d. nitrogen-15 to nitrogen-14
e. argon-40 to argon-39
A
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Explain why caprylic acid, CH3(CH2)6COOH, dissolves in a 5 percent aqueous solution of sodium hydroxide but caprylaldehyde, CH3(CH2)6CHO, does not
A) With two oxygens, the caprylic acid is about twice as polar the caprylaldehyde. B) The caprylaldehyde is a gas at room temperature. C) The caprylaldehyde behaves as a reducing agent, which neutralizes the sodium hydroxide. D) The caprylic acid reacts to form the water soluble salt.
How many separate sites of seismograph recordings are required to locate the center of an earthquake?
a. ?one b. ?two c. ?three d. ?four e. ?five
The density of seawater will increase when ____
A) the temperature increases B) the salinity decreases C) the salinity increases D) dissolved gases increase
Heterogeneity is more a characteristic of
A) suburban and rural communities. B) ancient urban centers than modern urban centers. C) manufacturing centers and rural populations. D) rural and urban centers. E) urban centers than rural communities.