下列实验操作或装置正确的是
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 5.00%的溶液、足量的溶液和100 10.00%的溶液,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?