试题与答案

(共10分)油脂是_____ ___ 跟____ ___生成的酯,其中形成油脂的

题型:填空题

题目:

(共10分)油脂是_____    ___ ____   ___生成的酯,其中形成油脂的脂肪酸的饱和程度对油脂的熔点有着重要的影响。由________  的脂肪酸生成的甘油酯熔点较高,常温下呈______态,叫做______,如生活中经常使用的________  等;由       的脂肪酸生成的甘油酯熔点较低,常温下呈________态,叫做________,如生活中经常使用的______  等。

答案:

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(1)下列有关说法正确的是_____________。

a.C3H8中碳原子都采用的是sp3杂化

b.O2、CO2、N2都是非极性分子

c.每个N2中,含有2个π键

d.CO的一种等电子体为NO+,它的电子式为

(2)CO与Ni可生成羰基镍[Ni(CO)4],已知其中镍为O价,镍原子在基态时,核外电子排布式为____;[Ni(CO)4]的配体是____,配位原子是____。

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题型:单项选择题

(D)

Consumers are being confused and misled by the hodge-podge of environmental claims made by household products, according to a "green labeling" study published by Consumers International Friday.

Among the report’s more outrageous findings-a German fertilizer described itself as "earthworm friendly" a brand of flour said it was "non-polluting" and a British toilet paper claimed to be "environmentally friendlier".

The study was written and researched by Britain’s National Consumer Council (NCC) for lobby group Consumer International. It was funded by the German and Dutch governments and the European Commission.

"While many good and useful claims are being made, it is clear there is a long way to go in ensuring shoppers are adequately informed about the environmental impact of products they buy." said Consumers International director Anna Fielder.

The 10-country study surveyed product packaging in Britain, Western Europe, Scandinavia and the United States. It found that products sold in Germany and the United Kingdom made the most environmental claims on average.

The report focused on claims made by specific products, such as detergent insect sprays and by some garden products. It did not test the claims, but compared them to labeling guidelines set by the International Standards Organization (ISO) in September, 1999.

Researchers documented claims of environmental friendliness made by about 2,000 products and found many too vague or too misleading to meet ISO standards.

"Many products had specially-designed labels to make them seem environmentally friendly, but in fact many of these symbols mean nothing." said report researcher Philip Page.

"Laundry detergents made the most number of claims with 158. Household cleaners were second with 145 separate claims, while paints were third on our list with 73. The high numbers show how very confusing it must be for consumers to sort the true from the misleading." he said.

The ISO labeling standards ban vague or misleading claims on product packaging, because terms such as "environmentally friendly" and "non-polluting" can not be verified. "What we are now pushing for is to have multinational corporations meet the standards set by the ISO." said Page.

A study was carried out by Britain’s NCC to().

A. find out how many claims made by products fail to meet environmental standards

B. inform the consumers of the environmental impact of the products they buy

C. examine claims made by products against ISO standards

D. revise the guidelines set by the International Standards Organization

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