未分类题
浓度均为0.01 mol·kg
-1
的蔗糖、HAc、NaC1、BaCl
2
的水溶液的凝固点哪一个最高?哪一个最低?
A.01
【参考答案】
NaCl、BaCl
2
是强电解质,HAc是弱电解质,蔗糖是非电解质。同浓度的化合物,其质点数大小依次......
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听力原文:W: Id rather not talk about it. Just dont ask. M: Come on. I think you need to let off some steam. Q: What does the man advise the woman to do?1.A.Speak to her previous employer.B.Get a job working on campus.C.Attend Career Service's workshop.D.Get a job application from him.
A.A.Speak
B.
B.Get
C.
C.Attend
D.
D.Get
E.
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溶解3.24g的硫于40g苯中,苯的沸点升高0.81K,已知苯的Kb=2.53K·kg·mol-1,问硫在此溶液中的分子是由几个硫原子组成的?
A.24g的硫于40g苯中,苯的沸点升高0.81K,已知苯的K
b
=2.53K·kg·mol
-1
,问硫在此溶液中的分子是由几个硫原子组成的?
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