【简答题】设nA 代表阿伏加德罗常数(NA )的数值,下列说法正确的是
【简答题】【T13】 A.BADLY B.BE COINED AFTER C.REFUSE TO D.FROM 1782 TO 1792 A.HE TREATED HIS POOR TENANTS VERY【T13】______ B.WHO LIVED【T14】______ C.MEANS TO【T15】______HAVE ANYTHING TO DO WITH SOMEBODY OR SOMETHING...
【单选题】设N A 代表阿伏加德罗常数的值,下列说法不正确的是( )
A.
阿伏加德罗常数N A 是0.012kg l2 C中所含的原子数
C.
标准状况下,11.2LNH 3 所含的原子数目为0.5N A
D.
含71gNa 2 SO 4 的溶液中所含Na + 离子数目为N A
【单选题】设N A 为阿伏加德罗常数的值,下列说法正确的是 [ ]
A.
1 mol/L的氯化钠溶液中钠离子的个数为N A
B.
依据阿伏加德罗定律,同温同体积下两种气体的物质的量之比等于压强之比
C.
在标准状况下,1L辛烷完全燃烧,所生成气态产物的分子数为8/22.4N A
D.
常温常压下,1 mol氦气含有的核外电子数为4N A
【单选题】设N A 代表阿伏加德罗常数的值,下列说法不正确的是( )
B.
阿伏加德罗常数N A 在数值上与0.012kg l2 C中所含的原子数相等
C.
标况下,22.4LNH 3 所含的分子数目为N A
D.
1L1mol/LNaCl溶液中所含有的Na + 离子数目为N A
【简答题】【T13】 A. BADLY B. BE COINED AFTER C. REFUSE TO D. HORN 1782 TO 1792 A. HE TREATED HIS POOR TENANTS VERY【T13】______ B. WHO LIVED【T14】______ C. MEANS TO【T15】______ HAVE ANYTHING TO DO WITH SOMEBODY OR S...
【单选题】China's flag is _____________. [ ]
【简答题】A green drink. There are many in China.
【单选题】根据以下资料,回答13~16题。 The winter in Iceland has been one of the worst ever.An animal that was born in Iceland and just returned there has enjoyed the weather.Keiko is a killer whale who is now living in a ...
A.
die from the cold water in Iceland
B.
be happy to return home
【单选题】Phytoplankton are the source of which color pigment?