游客
题文

青海昆仑玉被定为2008年北京奥运会奖牌用玉,昆仑玉主要成分是由“透闪石”和“阳起石”组成的纤维状微晶结合体,透闪石(Tremolite)的化学成分为Ca2Mg5Si8O22(OH)2.下列有关说法不正确的是

A.透闪石的化学式写成氧化物的形式为:2CaO·5MgO·8SiO2·H2O
B.透闪石中Mg元素的质量分数是Ca元素质量分数的1.5倍
C.1 mol Ca2Mg5Si8O22(OH)2与足量的盐酸作用,至少需要14 mol HCl
D.透闪石是一种新型无机非金属材料,难溶于水
科目 化学   题型 选择题   难度 中等
登录免费查看答案和解析
相关试题

It is often ______ that human beings are naturally equipped to speak.

A.said B.to say C.saying D.being said

I can’t leave. She told me that I ______ stay here until she comes back.

A.can B.must C.will D.may

—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact

A.Go ahead B.Yes, my pleasure
C.Yes, I do D.Come on

It’s high time you had your hair cut ; it’s getting _______ .

A.too much long B.much too long
C.long too much D.too long much

My friend showed me round the town, ______ was very kind of him.

A.which B.that C.where D.it

Copyright ©2020-2025 优题课 youtike.com 版权所有

粤ICP备20024846号