中和反应在日常生活和工农业生产中有广泛的应用.某化学兴趣小组的同学在老师的指导下

题型:问答题

问题:

中和反应在日常生活和工农业生产中有广泛的应用.某化学兴趣小组的同学在老师的指导下对酸碱中和反应进行了探究

提出问题:能否用碳酸钾溶液验证硫酸与氢氧化钠溶液发生中和反应.

实验药品:稀硫酸、稀氢氧化钠溶液、碳酸钾溶液.

实验仪器:试管、滴管、10mL量筒等

设计方案并实验:

小江同学的实验:在试管中加入2mL稀硫酸,逐滴加入______溶液,振荡后,再滴入V1mL______溶液,实验过程中无气泡逸出.反应的化学方程式为______.

小伟同学的实验:在试管中加入2mL稀硫酸,逐滴加入氢氧化钠溶液,振荡后,再滴入碳酸钾溶液,有气泡逸出,继续滴加碳酸钾溶液至恰好无气泡时,共消耗碳酸钾溶液V2mL.

小明同学的判断:小江的实验说明能用碳酸钾溶液来验证;小伟的实验还不能,需再做一个实验才能说明.

实验并判断:另取一支试管,加入2mL稀硫酸,____________(写出实验步骤、现象和判断依据).

结论:能用碳酸钾溶液验证硫酸与氢氧化钠溶液发生中和反应.

反思:在小江的实验中,碳酸钾溶液的作用是______(填字母).

A.仅是反应物    B.相当于指示剂      C.作催化剂.

考点:中和反应及在实际中的应用化学反应方程式的书写文字表达式酸的性质盐的性质
题型:问答题

根据所给汉语注释或题干信患,在答题卷上标有题号的横线上,写出空缺处各单词的正确形式。每空只限一词。

小题1:He was wearing a very   (严肃的)expression and I knew something was wrong.

小题2:Everybody should   (积极)join in this charity to raise money for the poor.

小题3:It is my father's   (四十)birthday this weekend.

小题4:Nowadays the people's living conditions in the countryside have   (改善)a lot.

小题5:I felt the   (温暖)of my mother's arms around me.

小题6:My cousin was busy (回复)to his pen friend when I came to visit him.

小题7:Three plus three (等于)six

小题8:Every time you answer a question  ,you will get a point.

小题9:-Smoking does   to health. Please give it up, Dad!

-OK, I will. I cough a lot recently.

小题10:- Do you know how much the ring is  

-I have no idea, but I think you can afford it.

题型:问答题

患者,男,71岁,慢性阻塞性肺气肿。上午9时起开始静脉输入5%葡萄糖溶液500ml及0.9%氯化钠溶液500ml,滴速为70滴/分,10时左右,护士来巡房时,发现患者咳嗽、咳粉红色泡沫样痰,呼吸急促,大汗淋漓。

为了减轻呼吸困难的症状,护士可采用()

A.10~20%酒精湿化加压给氧

B.20~30%酒精湿化加压给氧

C.30~40%酒精湿化加压给氧

D.40~50%酒精湿化加压给氧

E.50~70%酒精湿化加压给氧

题型:问答题

东南亚国家中,面积最大、人口最多的国家是_________,刚刚独立不久的国家是_______。

题型:问答题

Do you want to live with a strong sense of peacefulness, happiness, goodness, and self-respect? The collection of happiness actions broadly categorized(把…归类) as "honor" help you create this life of good feelings.

Here's an example to show how honorable actions create happiness.

Say a store clerk fails to charge us for an item. If we keep silent, and profit from the clerk's mistake, we would drive home with a sense of sneaky(卑鄙的) excitement. Later we might tell our family or friends about our good fortune. On the other hand, if we tell the clerk about the uncharged item, the clerk would be grateful and thank us for our honesty. We would leave the store with a quiet sense of honor that we might never share with another soul.

Then, what is it to do with our sense of happiness?

In the first case, where we don't tell the clerk, a couple of things would happen. Deep down inside we would know ourselves as a type of thief. In the process, we would lose some peace of mind and self-respect. We would also demonstrate(演示) that we cannot be trusted, since we advertise our dishonor by telling our family and friends. We damage our own reputations by telling others. In contrast, bringing the error to the clerk's attention causes different things to happen. Immediately the clerk knows us to be honorable. Upon leaving the store, we feel honorable and our self-respect is increased.  Whenever we take honorable action we gain the deep internal rewards of goodness and a sense of nobility(高尚).

There is a beautiful positive cycle that is created by living a life of honorable actions. Honorable thoughts lead to honorable actions. Honorable actions lead us to a happier existence. And it's easy to think and act honorably again when we're happy. While the positive cycle can be difficult to start, once it's started, it's easy to continue. Keeping on doing good deeds brings us peace of mind, which is important for our happiness.

小题1:According to the passage, the positive action in the example contributes to our_______.

A.self-respect

B.financial rewards

C.advertising ability

D.friendly relationship小题2:The author thinks that keeping silent about the uncharged item is equal to_______.

A.lying

B.stealing

C.cheating

D.advertising小题3:The underlined phrase "bringing the error to the clerk's attention" means_______.

A.telling the truth to the clerk

B.offering advice to the clerk

C.asking the clerk to be more attentive

D.reminding the clerk of the charged item小题4:How will we feel if we let the clerk know her mistake?

A.We'll be very excited.

B.We'll feel unfortunate.

C.We'll have a sense of honor.

D.We'll feel sorry for the clerk.小题5:Which of the following can be the best title of this passage?

A.How to Live Truthfully

B.Importance of Peacefulness

C.Ways of Gaining Self-respect

D.Happiness through Honorable Actions

题型:问答题

中共十八大以来党的最新理论贡献不包括()。

A、经济新常态理论

B、供给侧结构性改革理论

C、建设生态文明

D、“一带一路”

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