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(?厦门)请各写出一个化学反应方程式.
(1)硫在氧气中燃烧:S+O2
SO2
S+O2
SO2
.
(2)实验室制取氧气:2H2O2
2H2O+O2↑(合理即可)
2H2O2
2H2O+O2↑(合理即可).
(3)近日,美国悬赏征集以月球岩石中的含氧物质(如二氧化硅、氧化铝等)为原料在月球上制取氧气的研究成果.请大胆没想,写出一个可能完成此任务的化学方程式:______.最新问答:
解题思路:首先根据反应原理找出反应物、生成物、反应条件,根据化学方程式的书写方法、步骤进行书写即可.
(1)硫在氧气中燃烧生成二氧化硫,反应的化学方程式为:S+O2 点燃 . SO2.(2)实验室可采用分解过氧化氢的方法制取氧气,过氧化氢在二氧化锰的催化作用下生成水和氧气,反应的化学方程式为:2H2O2&…
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: 本题难度不大,考查学生根据反应原理书写化学方程式的能力,化学方程式书写经常出现的错误有不符合客观事实、不遵守质量守恒定律、不写条件、不标符号等.
阅读下列短文,根据短文中的信息完成文后表格。在答题卡标有题号的横线上,写出空缺处所填单词的正确形式。(每空一词)
The Slender West Lake Scenic Spot lies in the northwestern part of Yangzhou, with its south gate facing Great Rainbow Bridge Road. It covers an area of about 123.6 hectares. The Slender West Lake was named a National Key Scenic Spot in 1988 and National AAAAA Tourist Area in . The Slender West Lake used to be a long river named the Baozhang Lake, which is 4 kilometers in length and less than 100 meters in width. A famous poet Wang Hang in the Qing Dynasty once composed a poem (诗歌), from which the Slender West Lake gets its present name and to which it owes its great fame (名声) both at home and abroad. During the Sui and Tang Dynasties, many gardens were built along the Slender West Lake. Following the lines of the natural landscape, a large number of buildings along the moats were constructed(建造) in different locations during different periods. Emperors Kangxi and Qianlong of the Qing Dynasty both visited the Slender West Lake. The Slender West Lake Scenic Spot is an outstanding representative (代表) of the lake gardens in China. In a word, the Slender West Lake not only represents the beauty of natural landscape, but also embodies (体现) the richness of its history and culture. The Slender West Lake
Location
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The Slender West Lake, about 123.6 hectares in ___小题1:____, lies in the ____小题2:____ of Yangzhou, whose south gate ___小题3:____ Great Rainbow Bridge Road.
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Name
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It used to be a long river ___小题4:____ the Baozhang Lake. It gets its ____小题5:____ name from a poem and becomes ____小题6:____ both at home and abroad.
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_____小题7:_____
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Many gardens were built along the Lake during the Sui and Tang Dynasties. More buildings appeared along the moats during different periods. Emperors Kangxi and Qianlong both ____小题8:____ to the Slender West Lake.
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Features
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It ___小题9:____ the lines of the natural landscape and creates the unique beauty for the Slender West Lake. It also contains rich historical and ___小题10:___ meaning which attracts a lot of tourists.
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最新问答:
小题1:area
小题2:northwest
小题3:faces
小题4:called/named
小题5:present
小题6:famous
小题7:History / Development
小题8:traveled
小题9:follows
小题10:cultural