Answer the following question given this paragraph: Female reproductive organs form before birth. However, they do not mature until puberty. Q: When do female reproductive organs mature? Choices: - at menopause - at birth - periomenopause - at puberty A:
at puberty
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Answer the following question given this paragraph: Arachnids do not have antennae or wings. Q: While similar to insects, what eight-legged invertebrates lack antennae or wings? Choices: - spiders - reptiles - crustaceans - arachnids A:
arachnids
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Answer the following question given this paragraph: molecular masses. Primary amines tend to have boiling points intermediate between those of the corresponding alcohol and alkane. Moreover, secondary and tertiary amines have lower boiling points than primary amines of comparable molecular mass. Tertiary amines form cations analogous to the ammonium ion (NH 4+), in which all four H atoms are replaced by alkyl groups. Such substances, calledquaternary ammonium salts, can be chiral if all four substituents are different. (Amines with three different substituents are also chiral because the lone pair of electrons represents a fourth substituent. ) Alkylamines can be prepared by nucleophilic substitution reactions of alkyl halides with ammonia or other amines: Equation 24.12. Q: Which reaction between alkyl halides and ammonia makes alkylamines? Choices: - nitrogen catabolism - conductive substitution reactions - nucleophobic reactions - nucleophilic substitution reactions A:
nucleophilic substitution reactions
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Answer the following question given this paragraph: The fluoride ion is acting as a weak Brnsted-Lowry base. The hydroxide ion that is produced as a result of the above reaction makes the solution slightly basic. Salt hydrolysis is a reaction in which one of the ions from a salt reacts with water, forming either an acidic or basic solution. Q: Salt hydrolysis is a reaction in which one of the ions from a salt reacts with what? Choices: - proteins - fat - air - water A:
water
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