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【单选题】
(2018长春)在实验室里配制100 g溶质的质量分数为10%的NaCl溶液。 (1)用NaCl固体和蒸馏水配制溶液时,用到的玻璃仪器有烧杯、玻璃棒、胶头滴管和 量筒 。 (2)用浓溶液配制稀溶液时,计算的依据是稀释前后 溶 质 的质量保持不变。 下列配制方法可以达到上述实验目的是A.
将10 g NaCl固体与100 g水
B.
向50 g溶质的质量分数为20%的NaCl溶液中加入50 g水
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【单选题】It is known that modulus of compression of NaCl crystal is 2.4×1010Pa. If a pressure of 2×104atm is applied to NaCl crystal, how much will the distance between adjacent ions decrease?
A.
27.4%
B.
0.274%
C.
2.74%
D.
274%
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A.
$8,000
B.
$67,000
C.
$258,000
D.
$26,000
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【简答题】某小区绿化需要栽植10株胸径15cm的悬铃木,土球直径50cm。计算悬铃木的栽植费。
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