皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【简答题】
常见的治疗缺铁性贫血的方法是服用补铁药物,市场上一种常见的补铁药物的商品名称是:速力菲,正式名称是:琥珀酸亚铁薄膜片,为棕黄色薄膜衣片,除去薄膜衣后显暗黄色,药片中Fe 2+ 的含量约为34.0%~36.0%.该药片在乙醇中的溶解度不大.某学校化学实验小组为了检测“速力菲”药片中Fe 2+ 的存在,设计了如下几组理论实验设计方案: Ⅰ.甲组方案: (提示:白色的Fe(OH) 2 在空气中会迅速变成灰绿色,最后变成红褐色) 甲组同学按照设计的方案完成实验,但遗憾的是他们没有得到预期的实验结果.分析甲组实验失败的可能原因:______. Ⅱ.同学在参考书上如下资料: ①人体胃液中有大量盐酸,能溶解多种物质. ②H 2 O 2 不稳定,光照、加热和微量杂质会促使其分解;H 2 O 2 中氧元素为-1价,它既有氧化性又有还原性. 他们认真思考了甲组实验失败的原因,模拟药服用后在人体中溶解的变化过程,重新设计并完成下列实验: 方案: (1)试剂1为:______,试剂2为:______; (2)加入试剂2后,溶液显淡红色的原因是:______; (3)加双氧水后,红色加深的原因是:______.根据氧化还原反应中化合价变化情况,试写出在酸性条件下Fe 2+ 与双氧水反应的离子方程式:______. Ⅲ.丙组同学对实验中最后红色褪去的现象产生了浓厚的兴趣,欲探究其褪色的原因.根据粒子的组成,他们认为有两种可能原因:①[Fe(SCN)] 2+ 中的三价铁被还原为亚铁;②______. 请你对其中一种可能进行实验验证: 实验方案(用文字叙述):______. 根据预期现象判断结论:______.
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【单选题】Dickerson Corporation had the following activities, traceable costs, and physical flow of driver units: Traceable Physical Flow of Activities Costs Driver Units Account inquiry (hours) $1...
A.
a. $0.028
B.
b. $1.50
C.
c. $5.00
D.
d. $20.00
【多选题】竞技体校包含的内容是?
A.
培养高水平运动员
B.
为体育学院培养后备力量
C.
满足社会对体育人才的需要
D.
增强青少年体质
【简答题】举例说明针灸取穴原则。
【单选题】Baylor Corporation had the following activities, traceable costs, and physical flow of driver units: Traceable Physical Flow of Activities Costs Driver Units Account inquiry (hours) $8,000 500 hour...
A.
a. $3,000
B.
b. $150
C.
c. $300
D.
d. $450
【单选题】Youngblood Corporation had the following activities, traceable costs, and physical flow of driver units: Traceable Physical Flow of Activities Costs Driver Units Account inquiry (hours) $8,000 500 h...
A.
a. $100
B.
b. $500
C.
c. $1,000
D.
d.  None of these answers is correct.
【单选题】Baylor Corporation had the following activities, traceable costs, and physical flow of driver units: Traceable Physical Flow of Activities Costs Driver Units Account inquiry (hours) $8,000 500 hour...
A.
a. $8,000
B.
b. $800
C.
c. $1,280
D.
d. $20,800
【简答题】I suggested (go) ______ for a picnic.
【单选题】The examination results suggested that I in poor health,so the doctor suggested that I more exercises to improve it.
A.
was;took
B.
was;take
C.
be;took
D.
be;take
【简答题】举例说明针灸取穴原则。
【单选题】Dickerson Corporation had the following activities, traceable costs, and physical flow of driver units: Traceable Physical Flow of Activities Costs Driver Units Account inquiry (hours) $8,000 500 h...
A.
a. $0.04
B.
b. $1.50
C.
c. $5.00
D.
d. $16.00
相关题目:
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题