纯碱和小苏打都是白色晶体,在日常生活中都可以找到。若要在家中

纯碱和小苏打都是白色晶体,在日常生活中都可以找到。若要在家中将它们区分开来,下面的方法中可行的是   

A.分别放在炒锅中加热,观察是否有残留物

B.分别用干净铁丝蘸取样品在煤气炉的火焰上灼烧,观察火焰颜色

C.将样品溶解,分别加入澄清石灰水,观察是否有白色沉淀

D.在水杯中各盛相同质量的样品,分别加入等体积的白醋,观察反应的剧烈程度

答案

D

相关题目

设函数f(x)=x-lnx(x>0),则y=f(x)( ) (A)在区间(,1),(1,e)内
设函数f(x)=x-lnx(x>0),则y=f(x)( ) (A)在区间(,1),(1,e)内均有零点 (B)在区间(,1),(1,e)内均无零点 (C)在区间(,1)内有零点,在区间(1,e)内无零点 (
回家去问妈妈    毕淑敏 ①那一年游敦煌回来,兴奋地同
回家去问妈妈    毕淑敏 ①那一年游敦煌回来,兴奋地同妈妈谈起戈壁的黄沙和祁连的雪峰。说到丝绸之路上僻远的安西,哈密瓜汁甜得把嘴唇粘在
如图所示电路中,电源电压保持不变,闭合开关S后,将滑动
如图所示电路中,电源电压保持不变,闭合开关S后,将滑动变阻器R2的滑片P向右移动,在此过程中: A.电流表A示数变大,电压表V2示数变小   B.电
Every boy and every girl ______ that each day and each hour brings ______ duty.
Every boy and every girl ______ that each day and each hour brings ______ duty. A.know;their  B.knows;their C.knows;its   D.know;its  
—Do you have the New Chinese-English Dictionary?        —Yes, but no m
—Do you have the New Chinese-English Dictionary?        —Yes, but no more than one copy. Would you like to take            ?        A.some B.them C.it      D.on
《清明上河图》以写实的手法记录了古代开封的繁荣景象。
《清明上河图》以写实的手法记录了古代开封的繁荣景象。下列场景中不可能在画中出现的是(    )A.王家锦帛铺当街而设 B.刘三叔精装字画铺出
The pen ____ she writes letters is broken.A. whichB. thatC. with whichD. by whic
The pen ____ she writes letters is broken.A. whichB. thatC. with whichD. by which  
You may not pay much attention to your daily elevator(电梯) ride. Many of us
You may not pay much attention to your daily elevator(电梯) ride. Many of us use a lift several times during the day without really thinking about it. But Lee Gray, PhD, of the University o f Nort

最新题目