问题
选择题
three groups, we could do the job effectively and finished it on time. [ ]
A. Dividing into
B. Separating from
C. Divided into
D. Separated from
答案
答案:C
three groups, we could do the job effectively and finished it on time. [ ]
A. Dividing into
B. Separating from
C. Divided into
D. Separated from
答案:C
假如你的实验桌上有两瓶失去标签的未知溶液:稀硫酸和澄清石灰水;另有已知的试剂:铁片、贝壳、酚酞试液、硫酸铜溶液、稀盐酸、氯化钡溶液等.现要你设计出四种不同的方法鉴别这两瓶未知溶液.请按示例填写实验报告(若上述试剂不够,可另向实验室领取使用).
方案 | 选取的试剂或者方法 | 实验现象和结论 |
示例 | 铁片 | 有气泡产生的是稀硫酸;无气泡产生的是澄清石灰水 |
(1) | ||
(2) | ||
(3) | ||
(4) |