以下是以氧气为中心的知识网络图,据此写出有关化学反应的文字表达式:1...
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发布时间：2024-04-20 05:30
共1个回答
热心网友
时间：2024-04-20 08:39
2是常温下为液态的金属，则2是汞，反应的文字表达式为汞+氧气加热氧化汞；
3与氧气点燃生成大量白烟，则3是磷，反应的文字表达式为磷+氧气点燃五氧化二磷；
4在氧气中剧烧，火星四射，放出大量热，生成黑色固体，则4是铁，反应的文字表达式为铁+氧气点燃四氧化三铁；
（2）从四个反应可以看出它们有许多相同之处，如反应物都是两种物质，生成物都为一种物质，都属于化合反应，反应条件都是点燃，生成物都为氧化物，都是物质与氧气发生反应．
也有许多不同之处，如生成物的状态不同（碳反应生成气体，而其它反应生成固体），反应的条件不同（汞与氧气的反应条件是加热，而其它反应是点燃）
故答案为：（1）碳+氧气点燃二氧化碳；汞+氧气加热氧化汞；磷+氧气点燃五氧化二磷；铁+氧气点燃已赞过已踩过你对这个回答的评价是？评论收起 // 高质or满意or特型or推荐答案打点时间 window.iPerformance && window.iPerformance.mark('c_best', +new Date); 推荐律师服务：若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询 ._1uevpeq{zoom:1;background-color:#fff;border:0;margin-bottom:10px;padding:30px 0 20px 42px;position:relative}._1uevpeq.ec-1841{padding:20px 0}._1uevpeq.ec-2246{padding:20px 0 10px}.ec-1841 .y7we4hu{font-size:16px;margin-bottom:-5px}.y7we4hu{color:#7a8f9a;height:25px;line-height:25px;overflow:hidden;position:relative}.y7we4hu h2{margin:0;padding:0}.y7we4hu:after{clear:both;content:" ";display:block;height:0;visibility:hidden}a.tycfu7u{color:#666;float:right;font-size:12px;margin-left:8px;text-decoration:none}.hhhv6ex{color:#666;font-size:13px;line-height:normal;line-height:20px;margin-top:10px}.vnsdjzp{margin-top:15px;position:relative}.vnsdjzp h3{font-weight:400;padding:0}.vnsdjzp a{text-decoration:none}.vnsdjzp em{color:#d81419;font-style:normal}.ec-2246 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