下列实验中,溶液颜色不会发生变化的是( )
What do you mean, there are only ten tickets? There _____ be twelve
Could I speak to ______ is in charge of International Sales please?
How much _______ she looked without her glasses!
Let’s go to ______ cinema – that’ll take your mind off the problem for _____while.
下图所示装置中,甲、乙、丙三个烧杯依次分别盛放100 g 5.00%的 NaOH 溶液、足量的 CuS O 4 溶液和100 g 10.00%的 K 2 S O 4 溶液,电极均为石墨电极。(1)接通电源,经过一段时间后,测得丙中 K 2 S O 4 浓度为10.47%,乙中c电极质量增加。据此回答问题:①电源的N端为极;②电极b上发生的电极反应为;③列式计算电极b上生成的气体在标准状况下的体积:④电极c的质量变化是g;⑤电解前后各溶液的酸、碱性大小是否发生变化,简述其原因:甲溶液乙溶液丙溶液(2)如果电解过程中铜全部析出,此时电解能否继续进行,为什么?