下图是初中化学常见的几个实验操作,其中错误的是  (     )

下图是初中化学常见的几个实验操作,其中错误的是  (     )

答案

B

相关题目

某气体可能由、、CO组成,为确定其成分某兴趣依次进行了如
某气体可能由、、CO组成,为确定其成分某兴趣依次进行了如下实验假设每一步反应均完全进行 通过澄清的石灰水,未出现浑浊现象;通过灼热的氧化
下列实验装置或操作正确的是( )A.图①向Ⅰ中通入过量CO2,
下列实验装置或操作正确的是( )A.图①向Ⅰ中通入过量CO2,出现白色沉淀,则溶液中一定含有AlO B.图②两支试管中的蛋白质溶液均会变性 C.图③装
阅读理解 Here is a menu for a fast food restaurant, the prices are in Amer
阅读理解 Here is a menu for a fast food restaurant, the prices are in American money, called dollars and cents. There are 100 cents in a dollar. Main meals SmallLargeDrinksSmallLarge Hamburger
I want a large,________ box that won't break easily to contain some useful thing
I want a large,________ box that won't break easily to contain some useful things. A. genuine      B. solid           C. violent           D. slight
用化学符号或化学式填空。 (1)2个氮原子__。 (2)3个五氧化二
用化学符号或化学式填空。 (1)2个氮原子__。 (2)3个五氧化二磷分子___。 (3)小苏打__。 (4)铝元素__ __。
 That’s such a well-known place______everyone wants to visit______ we can fin
 That’s such a well-known place______everyone wants to visit______ we can find it in the map of the world. A. that, as    B. as, as    C. that, that    D. as, that
The media can often help solve problems and draw attention ﹍﹍situations﹍
The media can often help solve problems and draw attention ﹍﹍situations﹍﹍help is needed. A. in; that           B. to; which         C. in; where         D. to; where
在一定条件下,NO跟NH3可以发生反应:6NO+4NH3=5N2+6H2O,该反
在一定条件下,NO跟NH3可以发生反应:6NO+4NH3=5N2+6H2O,该反应中被氧化和被还原的氮元素的质量比是 A.3:2    B.2:1    C.1:1    D.2:3

最新题目