【名词&注释】
催化剂(catalyst)、二氧化锰、是不是(yes)
[多选题]如果用本实验探究铜是不是H2O2分解的催化剂,需要对上述实验方案进行补充,其中必要的是________。
A. 称量实验前铜丝网的质量
B. 将实验后的铜丝网干燥、称重
C. 向仪器中加入二氧化锰
D. 将实验后的铜丝网插入AgNO3溶液中
查看答案&解析查看所有试题
学习资料:
[单选题]62. Usually at weekends the girl will _______.
A. stay at home B.play with their classmates
B. do whatever she likes
C. go to different kinds of training courses
[单选题]2. We were angry __________ him ___________ keeping us waiting.
A. with; for
B. to; for
C. with ;as
D. to ;as
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