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[主观题]

A solution of which substance can best be used as both a titrant and its own indicator in an oxidati

on-reduction titration？

(a) I₂(b) NaOCl (c) K₂Cr₂O₇(d) KMnO₄

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发布时间：2022-12-04

更多“A solution of which substance can best be used as both a titrant and its own indicator in an oxidati”相关的问题

第1题

Compute [OH-] and [H+] in a 0.10 M solution of a weak monoprotic base which is 1.30% ionized. What i

Compute [OH^-] and [H⁺] in a 0.10 M solution of a weak monoprotic base which is 1.30% ionized. What is the pH of the solution？

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第2题

Will MnS be precipitated from a saturated solution of H2S（0. 10M) which is maintained at pH=5.00 by

Will MnS be precipitated from a saturated solution of H₂S(0. 10M) which is maintained at pH=5.00 by a buffer,if the concentration of Mn²⁺ini tially present is 0. 010M？

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第3题

Which paragraph offers a possible solution for brain drain？A．Paragraph 1.B．Paragraph 2.C．P

Which paragraph offers a possible solution for brain drain？

A．Paragraph 1.

B．Paragraph 2.

C．Paragraph 3.

D．Paragraph 4.

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第4题

One solution to major security problem is ______, which are frequently installed to fix known securi

ty holes.

A．patches B．compensations C．complements D．additions

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第5题

Which is not stated as the feature of expert systems？ A．Expert systems can always reason with metak

Which is not stated as the feature of expert systems？

A．Expert systems can always reason with metaknowledge.

B．Expert systems use knowledge rather than data to control the solution process.

C．Expert systems can explain how a particular conclusion is reached.

D．Expert systems use symbolic representations for knowledge.

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第6题

An iron bar is to be electroplated with zinc. ·Identify what will act as the two electrodes for the

An iron bar is to be electroplated with zinc.

·Identify what will act as the two electrodes for the cell

·Identify each electrode as either the anode or cathode

·Write the half- reactions occurring at each electrode

·Identify a solution that would make a suitable electrolyte for this cell

·Identify which electrode will be attached to the negative post of the battery and which will be attached to the positive post, and explain.

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第7题

In the year 2100, the world is going to have a population of about 8 billion. Most scienti

sts agree that the most severe problem is food supply. Who is going to feed all these people？ Where is the food going to come from？ Are we going to have enough food？ Are we going to produce more artificial foods？ One way of improving the situation is for people to eat less meat. Why？ Because it takes 4 kilos of grain protein(蛋白质)to produce half a kilo of meat protein. Clearly, there is not going to be sufficient meat protein for 8 billion people. Therefore, it will also be necessary to change eating habits because meat is the main part of many people s food today. A possible solution to this latter problem is the soybean(大豆). The soybean plant produces beans which have a very high fat and protein content. Scientists can now make these look and taste like real meat. They can also make many other artificial products such as soybean milk, for example, which has a taste of milk and can be used in cooking in very much the same ways as cow s milk. In fact, one woman in the United States fed her family only on soybeans for a year! She gave them soybean beef, soybean chicken, soybean milk, and sometimes just soybeans. Possibly, we are all going to eat soybeans in the future and finally give up meat completely from our tables.

What is the main subject of the passage？

A．A solution to man"s food problem.

B．A solution to the population problem.

C．Advantages of soybean.

D．How to develop good eating habits.

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第8题

根据下面内容，回答题： Many of the problems we face today are not so new as we think they a

根据下面内容，回答题：

Many of the problems we face today are not so new as we think they are. And some of our modern solutions are not so new， either. The problem of energy shortages and the solution of using solar energy go back at least to early Greek cultures. The climate in the coastal areas of Greece 2，500 years ago was characterized by cool winters， much as it is today. At that time， the Greeks heated their homes with small， charcoal-burning heaters. In other words， wood （which is used to make charcoal） was their primary source of energy.However， by the fifth century BC fuel shortages had become common because， in many parts of Greece， the firewood in the forests had been depleted. Once the supply of firewood from the local forests ran out， people began to use the wood from olive groves as fuel. But this solution had its own problem. It reduced the olive crop， a valuable resource to the Greeks. By the fourth century BC， the city of Athens banned the use of olive wood for fuel. Wood had to be imported from farther and farther away， making it more difficult to obtain and more expensive to use. About this time the Greeks began to build their houses facing south， so that the low sun in winter could penetrate and help heat the interiors. Excavations of ancient Greek cities suggest that large areas were planned so that individual homes could take maximum advantage of passive solar energy.

The word "depleted" means________. 查看材料

A.damaged

B.stolen

C.used up

D.discovered

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第9题

等渗溶液（isosmotic solution)

等渗溶液(isosmotic solution)

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第10题

Some Stanislaus County farmers are having a tough time harvesting their crops because of a

shortage of workers. For years Vito Chiesa, who farms near Hughson, has grown peaches, but these days he s replacing them with almonds (杏仁). " This is where I started losing peaches," he pointed out to NewslO reporter Tim Daly. "Just like that, we got the bulldozers(推土机)and pushed. You re going to see almonds out there next year." Farmers can t find enough workers to handle crops like peaches that require careful hand picking because machines would damage the ripe peaches and then the farmer could not sell them. Some farmers will soon switch to growing almonds. Almonds are harvested differently. They require fewer workers because trees are mechanically shaken. The almonds fall on the ground and then are gathered up. The farmer does not have to hire many workers to pick the almonds off the trees. Some farmers think there are a couple of reasons for the labor shortage, which is even worse in the southern Central Valley. One is that workers make higher wages doing construction work and there is plenty of that in the Central Valley. Another is that since the September 11, 2001 attacks, there is more enforcement at the state s border with Mexico, resulting in fewer workers coming into California. One solution might be to allow Mexican workers to work here as guests, so people who want to work and contribute to the economy of the U.S. can have the opportunity to provide for themselves and family. That would also help the farm labor situation without making the country less secure. Farmers say that unless things change, more produce will come from South America and China where labor is cheap and there is more competition.

The farmers are reported to have difficulty in______.

A．hiring harvest workers

B．selecting the right fruit to grow

C．selling their farm produce

D．changing their way of farming

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第11题

液相杂交（solution hybridization)

液相杂交(solution hybridization)

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