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实验室里某小组正在探究一个问题。根据设计方案，向试管中加入2mL氢氧化钠溶液，滴入几滴酚酞溶液，溶液显红色。然后她又用滴管连续滴入一定量的稀硫酸，溶液由红色变为无色。 （1）他们探究的问题是_______（填Ⅰ或Ⅱ） Ⅰ．酚酞溶液遇酸、碱溶液能显示不同颜色吗？ Ⅱ．酸和碱溶液能发生反应吗？ （2）大家对得到的无色溶液继续探究。小斌认为反应后溶液中的溶质是硫酸钠，认为溶质有两种，它们是_______。同学们根据以下两种方案进行实验后，一致认为的观点是正确的。请你补填下表的空缺。 （3）请你和同学一起分析以下问题。 ①稀硫酸和氢氧化钠溶液发生反应的微观过程如图1所示。从粒子的角度具体分析该反应能发生的原因是_____________。 ②锌和硫酸铜溶液发生反应的微观过程如图2所示。从粒子的角度具体分析该变化是化学变化的原因是_____________。 ③通过以上分析，揭示出化学反应的微观本质是_____________。
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参考答案：
举一反三
【单选题】From the last two paragraphs, we get the impression that
A.
people feel disappointed with the US share market.
B.
most people have confidence in the Silicon Valley’s future.
C.
a large number of workers are made redundant.
D.
millionaires in the Valley are all bankrupted earlier this year.
查看完整题目与答案
【单选题】What made the visitor feel ashamed and regretful?
A.
Going to work late
B.
Eating too much
C.
Sleeping too late
D.
He did not want to go back to work, and when he was going to work, he did not know what to do.
查看完整题目与答案
【单选题】The door was ______ and I could not see who she was talking to . ( )
A.
shut
B.
shutted
C.
shutting
D.
being shut
查看完整题目与答案
【单选题】We feel regretful that you ask us to allow you a commission _____ 10% on each sale.
A.
of
B.
on
C.
to
D.
/
查看完整题目与答案
【单选题】Americans will be regretful for ______.
A.
the extravagant ways of living in the suburbs
B.
the fast-growing developments in the suburbs
C.
the devastation caused by the economic crisis
D.
what they have done over the past few months
查看完整题目与答案
【单选题】教学的首要任务是（ ）
A.
引导学生掌握科学文化基础知识和基本技能
B.
发展学生智力，培养学生的创造能力
C.
发展学生体力．提高学生的健康水平
D.
培养学生高尚的审美情趣
查看完整题目与答案
【单选题】Those who themselves to pleasure and don't work hard when they are young will surely feel regretful when they are old. [     ]
A.
range
B.
burden
C.
abandon
D.
devote
查看完整题目与答案
【判断题】教学的首要任务是引导学生掌握系统的科学文化基础知识和基础技能()
A.
正确
B.
错误
查看完整题目与答案
【单选题】According to the time table, the next shutt le bus _________ at 7:00 in the evening.
A.
leaves
B.
is left
C.
has left
D.
will leave
查看完整题目与答案
【判断题】内建作用域中的变量在任何位置都是可见的,可以随时被使用
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】From the last two paragraphs, we get the impression that
A.
people feel disappointed with the US share market.
B.
most people have confidence in the Silicon Valley’s future.
C.
a large number of workers are made redundant.
D.
millionaires in the Valley are all bankrupted earlier this year.
查看完整题目与答案
【单选题】What made the visitor feel ashamed and regretful?
A.
Going to work late
B.
Eating too much
C.
Sleeping too late
D.
He did not want to go back to work, and when he was going to work, he did not know what to do.
查看完整题目与答案
【单选题】The door was ______ and I could not see who she was talking to . ( )
A.
shut
B.
shutted
C.
shutting
D.
being shut
查看完整题目与答案
【单选题】We feel regretful that you ask us to allow you a commission _____ 10% on each sale.
A.
of
B.
on
C.
to
D.
/
查看完整题目与答案
【单选题】Americans will be regretful for ______.
A.
the extravagant ways of living in the suburbs
B.
the fast-growing developments in the suburbs
C.
the devastation caused by the economic crisis
D.
what they have done over the past few months
查看完整题目与答案
【单选题】教学的首要任务是（ ）
A.
引导学生掌握科学文化基础知识和基本技能
B.
发展学生智力，培养学生的创造能力
C.
发展学生体力．提高学生的健康水平
D.
培养学生高尚的审美情趣
查看完整题目与答案
【单选题】Those who themselves to pleasure and don't work hard when they are young will surely feel regretful when they are old. [     ]
A.
range
B.
burden
C.
abandon
D.
devote
查看完整题目与答案
【判断题】教学的首要任务是引导学生掌握系统的科学文化基础知识和基础技能()
A.
正确
B.
错误
查看完整题目与答案
【单选题】According to the time table, the next shutt le bus _________ at 7:00 in the evening.
A.
leaves
B.
is left
C.
has left
D.
will leave
查看完整题目与答案
【判断题】内建作用域中的变量在任何位置都是可见的,可以随时被使用
A.
正确
B.
错误
查看完整题目与答案
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