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【简答题】
Translate each of these statements into logical expressions using predicates, quantifiers, and logical connectives. (Hint: Let R ( x ) be " x is in the correct place”; let E ( x ) be “ x is in excellent condition”; let T ( x ) be “ x is your tool”; and let the domain of discourse be all things. ) a) Something is not in the correct place. b) All tools are in the correct place and are in excellent condition. c) Everything is in the correct place and in excellent condition. d) Nothing is in the correct place and is in excellent condition. e) One of your tools is not in the correct place, but it is in excellent condition.
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【单选题】往 1 升 0.1mol · L -l 的氨水溶液中加入一些 NaCl 晶体,此时
A.
氨水的电离度减少
B.
氨水的电离度增大
C.
溶液的 pH 减少
D.
溶液的 H + 离子浓度不变
【单选题】往 1L 0.1 mol·L -1 的 NH 3 ·H 2 O 溶液中加入一些 NH 4 CL 晶体,会使 ( )
A.
K b ( NH 3 ·H 2 O )增大
B.
K b ( NH 3 ·H 2 O )减小
C.
溶液的 pH 增大
D.
溶液的 pH 减小