问题 选择题

实验是人们认识物质的重要手段,关于下列四个实验的论述错误的是(  )

玻璃棒的作用是引流酸类物质具有相似的化学性质,但由于酸根离子不同,其性质也存在差异通过对比蜡烛在空气中燃烧的现象得出:反应物的浓度影响反应的剧烈度导管的长度对蒸馏效果没有影响
 

答案

答案:D

题目分析:A、过滤中玻璃棒起到引流液体的作用,正确;B、氯离子和钡离子不反应,硫酸根离子和钡离子能结合成硫酸钡白色沉淀,正确;C、氧气支持燃烧,氧气浓度越大可燃物燃烧就越剧烈,正确;D、蒸馏时导管越长水蒸气变成水的速度就越快,不正确。

阅读理解

Chicken feathers are useful, and not just to a chicken. Some go into pillows, coats and other products. But countless chicken feathers go to waste.

In the United States, billions of chickens are produced yearly. Most of their feathers are thrown away.

But instead of being buried in land, some feathers could find a future in plastics(塑料).

One of the products they have developed is a flowerpot(花盆). It may look like other flowerpots. But the container breaks down in the earth within one to five years. And as it breaks down, it naturally becomes nutrient(营养物) in the soil.

The environmentally friendly flowerpot is the work of two researchers. Walter Schmidt is with the Agricultural Research Service, part of the United States Agriculture Department. Masud Huda is with the Horticultural Research Institute, a private(私人) organization(组织).

Walter Schmidt has been working to find uses for chicken feathers since the 1990s. Progress in 2002 showed that plastic made from feathers could be formed like other plastics.

He says feathers are much stronger and last(持续) longer than another plant material. "Feathers are stronger. By design, feathers are also more durable(耐用的). And the other part about it is if feathers were twice as heavy, or half as strong, then birds couldn't fly."

He points out that traditional flowerpots made from other plastics can last much longer. But he wonders if there is really a need. He says most flowerpots are never re-used.

"Why would you want a plastic that you use for a year to last for two hundred years? It makes no sense. You want to match the product with the use." said Walter Schmidt.

Walter Schmidt and Masud Huda are now adding another chicken product to their flowerpots -- chicken waste. The waste will add more nutrients to the soil as the pot breaks down. The scientists say they hope their flowerpot will be on the market in a year or two.

小题1:What do people mainly deal with feathers?

A.Feathers are used to make pillows, coats and other products.

B.Most feathers are paid no attention to.

C.Most feathers are used as nutrient

D.Most feathers are used to make flowerpots小题2:What’s the advantage of the flowerpots?

A.They won’t last long.

B.They can’t break

C.They are environmentally friendly

D.They can be reused小题3:What does Walter Schmidt think of traditional flowerpots?

A.Too heavy

B.Too old

C.Never re-used

D.lasting longer but unnecessary小题4:What do you think is the main idea of the passage?

A.Chicken and its feathers

B.How to deal with feathers

C.feathers made into flowerpot

D.New flowerpots

选择题