题目

硫化锌(ZnS)是一种重要的化工原料，难溶于水，可由炼锌的废渣锌灰制取，其工艺流程如下图所示。（1）为提高锌灰的浸取率，可采用的方法是____________(填序号)。①研磨 ②多次浸取③升高温度④加压⑤搅拌（2）步骤Ⅱ所得滤渣中的物质是_______________(写化学式)。（3）步骤Ⅲ中可得Cd单质，为避免引入新的杂质，试剂X应为____________。（4）步骤Ⅳ还可以回收Na2SO4来制取Na2S。①检验ZnS固体是否洗涤干净的方法是_________________。②Na2S可由等物质的量的Na2SO4 请根据句意从方框中选择合适的动词，并用其适当时态填空，使句子通顺。 finish    become    talk    be    taste 1. Don't talk loudly, my father with my uncle __ _____ about something.2. The food ____ ____better than it looked.3. I hope I ____ ____ a singer when I grow up.4. Our school year usually ____ ____ at the end of June.5. Jack____ ___ often nervous before the class in the past.