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【简答题】
某研究性学习小组用下列装置（铁架台等支撑仪器略）探究氧化铁与乙醇的反应，并检验反应产物． （1）组装好仪器后必须进行的操作是______，用2%的CuSO 4 溶液和10%的NaOH溶液配制Cu（OH） 2 悬浊液的注意事项是______． （2）为快速得到乙醇气体，可采取的方法是______；若实验试管中的溶液已经开始发生倒吸，你采取的措施是______（填写编号）； a．取下小试管 b．移去酒精灯 c．将导管从乳胶管中取下 d．以上都可以 （3）如图实验，观察到红色的Fe 2 O 3 全部变为黑色固体（M），充分反应后停止加热．取下小试管，加热，有砖红色沉淀生成，小试管中发生反应的化学方程式是______． （4）为了检验M的组成，进行下列实验． ①M能被磁铁吸引；加入足量稀硫酸，振荡，固体全部溶解，未观察到有气体生成； ②经检验溶液中有铁离子和亚铁离子，检验铁离子的方法是______；能得出的结论是______（填写编号）． a．一定有+3价和+2价铁，无0价铁 b．一定有+3价，0价和+2价铁至少有一种 c．一定有+3价和0价铁，无+2价铁 d．一定有+3价、+2价和0价铁 （5）若M的成份可表达为Fe x O y ，用CO还原法定量测定其化学组成．称取agM样品进行定量测定，实验装置如图2，步骤如下： ①组装仪器；②点燃酒精灯；③加入试剂；④打开分液漏斗活塞；⑤检查气密性；⑥停止加热；⑦关闭分液漏斗活塞；⑧…．正确的操作顺序是______（填写编号） a．①⑤④③②⑥⑦⑧b．①③⑤④②⑦⑥⑧ c．①⑤③④②⑥⑦⑧d．①③⑤②④⑥⑦⑧ （6）若实验中每步反应完全，反应后M样品质量减小bg，则Fe x O y 中 x y =______．
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参考答案：
举一反三
【单选题】下列元素中，哪一个不是达利作品中常用的？
A.
蚂蚁
B.
抽屉
C.
太空象
D.
花
查看完整题目与答案
【单选题】The Whites came here to buy some clothes and _____ on an old friend of theirs.
A.
call
B.
for calling
C.
calling
D.
called
查看完整题目与答案
【简答题】The Beginning of the Civil Rights Movement In 1955，bus seats for African Americans and whites were separated in parts of the U．S.. On December 1,1955，in the city of Montgomery，Alabama，a conflict，or di...
查看完整题目与答案
【判断题】Some whites were driven by religious convictions and took part in this movement.
A.
正确
B.
错误
查看完整题目与答案
【判断题】Marguerite met Mrs. Flowers in the town of Stamps where the B、lacks and whites were equal.()
A.
正确
B.
错误
查看完整题目与答案
【单选题】髋骨的骨性标志,除哪项外都是正确的描述?
A.
外侧面的深窝称为髋臼
B.
髂骨上缘较厚，称为髂骨翼
C.
髂嵴前段的突起称为恰前上棘
D.
与骶骨相连接的关节面称为耳状面
查看完整题目与答案
【单选题】额定电压6KV的油断路器在新安装及大修后作交流耐压试验,应选标准试验电压()千伏。
A.
28
B.
15
C.
10
D.
38
查看完整题目与答案
【简答题】In the Southern states,whites were sentenced to
查看完整题目与答案
【单选题】Some of the whites of Cuba thought one race of men is better than any other.
A.
Right.
B.
Wrong.
C.
Doesn't say.
查看完整题目与答案
【单选题】Blameless I was a freshman in college when I met the Whites. They were completely different from my own family, yet I felt at home with them immediately. Jane White and I became friends at school, and...
A.
The author's parents were less caring.
B.
The author's parents were less loving.
C.
The author's parents were less friendly.
D.
The author's parents were less understanding.
查看完整题目与答案
相关题目：
【单选题】下列元素中，哪一个不是达利作品中常用的？
A.
蚂蚁
B.
抽屉
C.
太空象
D.
花
查看完整题目与答案
【单选题】The Whites came here to buy some clothes and _____ on an old friend of theirs.
A.
call
B.
for calling
C.
calling
D.
called
查看完整题目与答案
【简答题】The Beginning of the Civil Rights Movement In 1955，bus seats for African Americans and whites were separated in parts of the U．S.. On December 1,1955，in the city of Montgomery，Alabama，a conflict，or di...
查看完整题目与答案
【判断题】Some whites were driven by religious convictions and took part in this movement.
A.
正确
B.
错误
查看完整题目与答案
【判断题】Marguerite met Mrs. Flowers in the town of Stamps where the B、lacks and whites were equal.()
A.
正确
B.
错误
查看完整题目与答案
【单选题】髋骨的骨性标志,除哪项外都是正确的描述?
A.
外侧面的深窝称为髋臼
B.
髂骨上缘较厚，称为髂骨翼
C.
髂嵴前段的突起称为恰前上棘
D.
与骶骨相连接的关节面称为耳状面
查看完整题目与答案
【单选题】额定电压6KV的油断路器在新安装及大修后作交流耐压试验,应选标准试验电压()千伏。
A.
28
B.
15
C.
10
D.
38
查看完整题目与答案
【简答题】In the Southern states,whites were sentenced to
查看完整题目与答案
【单选题】Some of the whites of Cuba thought one race of men is better than any other.
A.
Right.
B.
Wrong.
C.
Doesn't say.
查看完整题目与答案
【单选题】Blameless I was a freshman in college when I met the Whites. They were completely different from my own family, yet I felt at home with them immediately. Jane White and I became friends at school, and...
A.
The author's parents were less caring.
B.
The author's parents were less loving.
C.
The author's parents were less friendly.
D.
The author's parents were less understanding.
查看完整题目与答案
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