A:向Na2S03溶液中加入硝酸酸化的BaCl2溶液,有白色沉淀出现,说明Na2S03溶液已经变质
B:向皂化反应后的混合物中加入食盐可分离出高级脂肪酸钠,说明高级脂肪酸钠在此时容易析出
C:等体积、都为3的酸HA和HB分别与足量的锌反应,HA放出的氢气多,说明酸性:
D:向浓度均为0.1的MgCl2、CuCl2混合溶液中逐滴加入少量氨水,先生成
Hello,I'm Bill. I like swimming.This is my father.He likes reading.This is my mother.She likes singing.This is my brother.He likes skating.This is my sister.She likes dancing.What about you?
观察下图——向“距离”挑战。结合所学知识判断,下列叙述正确的是( )