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1.2003年2月1日,美国哥伦比亚号航天飞机在返回地面的途中坠毁,举世震惊,尽管科学家在探索太空的过程中遇到了挫折,但这决不会阻止人类对太空科学探究的步伐。该航天飞机用铝粉和高氯酸铵(NH4ClO4)的混合物作固体燃料,点燃时,铝粉氧化放热引发高氯酸反应,其热化学方程式可表示为:
1. On February 1, 2003, the space shuttle Columbia of the United States crashed on its way back to the ground and was shocked by the world. Although scientists encountered setbacks in the process of exploring space, this will never stop the pace of human space science exploration. The space shuttle uses a mixture of aluminum powder and ammonium perchlorate (NH4ClO4) as a solid fuel. When it is ignited, aluminum powder oxidation causes an exothermic reaction to initiate perchloric acid reaction. The thermochemical equation can be expressed as: