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(2003?甘肃)写出下列反应的化学方程式:
(1)磷在氧气中燃烧4P+5O2
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2P2O5
4P+5O2
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2P2O5
;
(2)铁和硫酸铜溶液反应______;
(3)二氧化碳与焦炭在高温下反应CO2+C
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2CO
CO2+C
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2CO;
(4)氯化铁溶液和氢氧化钠溶液混合______.最新问答:
(2)铁与硫酸铜反应会置换出硫酸铜中的铜进行分析解决.
(3)二氧化碳和焦炭反应时是一氧化碳进行分析解决.
(4)氯化铁与氢氧化钠反应生成氢氧化铁和氯化钠进行分析解决.
(1)磷在氧气中燃烧时会生成五氧化二磷,然后利用化学方程式书写规则书写即可.
(2)铁与硫酸铜反应会置换出硫酸铜中的铜进行,然后利用化学方程式书写规则书写即可.
(3)二氧化碳和焦炭反应时是一氧化碳进行,然后利用化学方程式书写规则书写即可.
(4)氯化铁与氢氧化钠反应生成氢氧化铁和氯化钠,然后利用化学方程式书写规则书写即可.
故答案为:
(1)4P+5O2
点燃
.
2P2O5;
(2)Fe+CuSO4=FeSO4+Cu;
(3)CO2+C
高温
.
2CO;
(4)FeCl3+3NaOH═Fe(OH)3↓+3NaCl;
点评:
本题考点: 书写化学方程式、文字表达式、电离方程式.
考点点评: 化学方程式的书写,可以联系着质量守恒定律、元素符号和化学式的书写及其意义、化学方程式的配平、常见物质的状态等相关知识细心地进行书写.并且,书写化学方程式的步骤,可以简记为“写、配、标、注”四个字.
用先行词it改写列句子
1.用先行词it改写下列句子:
(1)Possibly the Joneses will come to the party as well.
(2)Whether they will come or not doesn′t matter very much.
(3)He is quite likely to let you down.
(4)You seem to have taken a dislike to him.
(5)I happen to have had some nasty experiences in dealing with him.
(6)Getting the car on the boat was rather complicated.
(7)To be with you here this evening is a great pleasure.
(8)You were so kind to invite us.
(9)What you say does not matter in the least.
(10)How he came to have such a valuable painting is a mystery.最新问答:
it doesnt matter very much whether they will come or not
it is quite likely for him to let you down
it seems you have taken a dislike to him
it happens to me that i have had soem nasty experiences in dealing with him
it was rather complicated getting inthe car on the boat
it is a great pleasure to be here with you this evening
it is so kind of you to invite us
it dosent matter in the least of what you say
it is a mystery how he came to have such a valuable painting