Tuesday, September 13, 2022
问题:下列物质露置在空气中最容易发生“自燃”的是()A、木炭B、铜C、白磷D、硫
Tuesday, September 13, 2022
Sunday, December 3, 2023
问题:下列各组变化中,后者一定包括前者的是:()A、化学变化、物理变化B、还原反应、置换反应C、氧化反应、化合反应D、中和反应、复分解反应
Tuesday, September 13, 2022
Thursday, February 8, 2024
Tuesday, September 13, 2022
Saturday, September 10, 2022
Friday, December 8, 2023
Thursday, July 20, 2023
Saturday, September 10, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
问题:用碘量法进行氧化还原滴定时,错误的操作是()。A、在碘量瓶中进行B、避免阳光照射C、选择在适宜酸度下进行D、充分摇动
Saturday, April 20, 2024
Monday, September 9, 2024
问题:过滤的目的是将()与()分离,通常过滤是通过()或()()进行.
Monday, October 31, 2022
问题:将4gNaOH溶解在10mL水中,稀至1L后取出10mL,其物质的量浓度是()A、1mol/LB、0.1mol/LC、0.01mol/LD、10mol/L
Thursday, February 8, 2024
问题:1%酚酞的配置方法是:将g酚酞溶于60ml乙醇中,用水稀释至(),配置100ml甲基橙所用甲基橙质量(),溶剂为()。
Tuesday, September 13, 2022
Tuesday, September 13, 2022
问题:在分析天平上称样时,可否将手较长时间伸入天平内加减样品?为什么?
Saturday, October 21, 2023