乙烯的结构式是“H2C==CH2”,那为什么有的结构式是直接写双键?乙烷也是直接写成一根杠,乙炔也 关于乙烯的几道题
\u5728\u9ad8\u4e2d\uff0c\u4e59\u70ef\u7684\u7ed3\u6784\u5f0f\u5199\u6210\u201cH2C==CH2\u201d\u53ef\u4ee5\u5417\uff1f \u6709\u7684\u5199\u6210\u201cCH2==CH2\u201d\u90fd\u53ef\u4ee5\uff0c\u7b2c\u4e00\u4e2a\u5176\u5b9e\u66f4\u89c4\u8303
1.A:\u6bd4\u8f83CH4\u3001C2H6\u548cC3H8\u7684C%\u53d1\u73b0,\u70f7\u70c3\u7684\u542b\u78b3\u91cf\u968f\u78b3\u539f\u5b50\u6570\u9012\u589e\u800c\u53d8\u5927.\u9519
B:CH4+2O2=CO2+2H2O.\u9519
C:\u78b3\u548c\u6c22\u7684\u8d28\u91cf\u6bd4\u4e3a12n/2n=6.\u5bf9
D:CnH2n+1.5nO2=nCO2+nH2O.\u9519
\u9009C
2.\u8bbe\u70c3A\u548c\u70ef\u70c3B\u5e73\u5747\u4e3aCxHy,\u5219
x=4/2=2,y=4.8\u00d72/2=4.8
\u6240\u4ee5A\u548cB\u5e73\u5747\u78b3\u539f\u5b50\u6570\u4e3a2\uff0c\u5e73\u5747\u6c22\u539f\u5b50\u6570\u4e3a4.8
\u8ba8\u8bba1\u70ef\u70c3\u662fC2H4:
A\u662fCH4\u6c22\u539f\u5b50\u4e0d\u7b26,\u820d\u53bb
A\u662fC2H6\uff0c\u7528\u5341\u5b57\u4ea4\u53c9\u5f97C2H4\u548cC2H6\u4f53\u79ef\u6bd4\u4e3a3/2\u5373\u53ef
A\u7684\u78b3\u539f\u5b50\u5927\u4e8e2\uff0c\u78b3\u539f\u5b50\u4e0d\u7b26,\u820d\u53bb
\u8ba8\u8bba2\u70ef\u70c3\u662fC3H6
A\u662fCH4\uff0c\u5f53C3H6\u4e0eCH4\u4f53\u79ef\u6bd41/1\u65f6,\u78b3\u539f\u5b50\u5e73\u5747\u4e3a2,\u4f46\u662f\u6b64\u65f6\u6c22\u539f\u5b50\u4e0d\u7b26,\u820d\u53bb
B\u78b3\u539f\u5b50\u5927\u4e8e2\uff0c\u78b3\u539f\u5b50\u4e0d\u7b26,\u820d\u53bb
\u8ba8\u8bba3\u70ef\u70c3\u78b3\u539f\u5b50\u5927\u4e8e3,\u8ba8\u8bba\u7c7b\u4f3c,\u5747\u4e0d\u7b26
\u6240\u4ee5A\u7ed3\u6784\u7b80\u5f0fCH3CH3,B\u7ed3\u6784\u7b80\u5f0fCH2=CH2
B\u5728\u6df7\u5408\u6c14\u4e2d\u4f53\u79ef\u5206\u6570\u4e3a3/5=60%
3.A:\u4e59\u70ef\u53ef\u4ee5\u52a0\u6210.\u5bf9
B:\u73b0\u8c61\u6b63\u786e
C:\u6b63\u786e
D:\u53cc\u952e\u65ad\u88c2\u65f6\u53d1\u751f\u52a0\u6210,C-H\u65ad\u88c2\u53d1\u751f\u53d6\u4ee3
\u9009D
4.120\u2103H2O\u4e3a\u6c14\u4f53,\u7531\u70c3\u71c3\u70e7\u901a\u5f0fCxHy+(x+y/4)O2\u70b9\u71c3\u2192xCO2+(y/2)H2O
\u73b0\u4f53\u79ef\u4e0d\u53d8,\u6709
1+x+y/4=x+y/2
y=4
\u6240\u4ee5\u9009B
你说的是键线式,是另一种表示方法。H2C==CH2严格地说也不是结构式,是结构简式。
绛旓細缁撴瀯绠寮忥細 H2C=CH2 鍖栧寮 锛 C2H4 瀹為獙寮忥細 CH2 杩欎釜鏄渶绠鐨
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绛旓細CH2=CH2 浠庤〃闈笂鏉ョ湅锛屽ソ鍍忔槸宸﹁竟鐨凥涓庡彸杈圭殑C杩炲湪浜嗕竴璧凤紝杩欐槸涓嶅涓ヨ皑鐨勩傝H2C=CH2 浠庤〃闈笂鏉ョ湅锛岀殑纭槸绗﹀悎涔欑儻鐨勭粨鏋勫紡锛屽嵆涓や釜纰冲師瀛愪互鍙岄敭鐩歌繛锛岃繖鏄渶涓ヨ皑鐨勫啓娉曘備笉杩囨讳綋鏉ヨ锛岀幇鍦ㄥ凡缁忎笉璁¤緝浜嗐侷 support the spirit of your chemistry teacher!
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