题干

哥伦比亚号航天飞机曾用金属铝粉和高氯酸铵(NH4ClO4)混合物做为固体燃料,加热铝粉使其被氧气氧化,放出大量的热,促使混合物中高氯酸铵受热分解。同时生成四种气体:一种气体是空气中的主要成分,一种气体是氯气(Cl2)还有一种气体是化合物(常温下是液态)因而产生巨大的推动力。试写出其中涉及反应的化学方程式:
(1)铝粉被氧气氧化成三氧化二铝:____ 。
(2)高氯酸铵受热分解:____ 。

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答案(点此获取答案解析)

4Al+3O2= 2Al2O3,2NH4ClO4 N2↑+2O2↑+Cl2↑+4H2O↑

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    If women are mercilessly exploited(剥削)year after year,they have only themselves to blame.Because they tremble at the thought of being seen in public in clothes that are out of fashion,they are always taken advantage of by the designers and the big stores.Clothes which have been worn only a few times have to be put aside because of the change of fashion.When you come to think of it,only a woman is capable of standing in front of a wardrobe(衣橱)packed full of clothes and announcing sadly that she has nothing to wear.

    Changing fashions are nothing more than the intentional creation of waste.Many women spend vast sums of money each year to replace clothes that have hardly been worn.Women who cannot afford to throw away clothing in this way,waste hours of their time altering(政变)the dresses they have.Skirts are lengthened or shortened;neck-line are lowered or raised,and so on.

    No one can claim that the fashion industry contributes anything really important to society.Fashion designers are rarely concerned with vital things like warmth,comfort and durability(耐用).They are only interested in outward appearance and they take advantage of the fact that women will put up with any amount of discomfort,as long as they look right.There can hardly be a man who hasn't at some times in his life smiled at the sight of a woman shaking in a thin dress on a winter day,or delicately picking her way through deep snow in high-heeled shoes.

    When comparing men and women in the matter of fashion,the conclusions to be drawn are obvious.Do the constantly changing fashions of women's clothes,one wonders,reflect basic qualities of inconstancy and instability (不稳定)?Men are too clever to let themselves be cheated by fashion designers.Do their unchanging styles of dress reflect basic qualities of stability and reliability(可靠)?That is for you to decide.