作者查詢 / evanzxcv
作者 evanzxcv 在 PTT [ Chemistry ] 看板的留言(推文), 共2359則
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2F推: 定義問題而已,兩種互溶的液體(如水和酒精),性質是隨著09/23 07:21
3F→: 兩物質比例平滑變化的,不會在50%就突然出現不可微分的09/23 07:21
4F→: 跳動,所以硬要說誰是溶質其實意義不大09/23 07:21
7F推: 不抽真空的話要300度才夠08/05 21:54
9F→: 用Lindlar變乙烯,加HBr,就有很好用的溴乙烷了07/26 15:11
11F推: 樓上那樣會變環己醇07/26 17:45
12F→: 而且dienophile沒有拉電子基很難反應07/26 17:46
1F推: 膽固醇有27個碳、一個醇基;月桂酸有12個碳、一個羧酸基06/23 18:01
2F→: 前者每一個極性基團對應的碳鏈較長,且羧基的極性高於醇06/23 18:02
3F→: 所以月桂酸的極性高於膽固醇06/23 18:03
12F推: 雙鍵當作下一個原子接兩個,再比不出來的話再遞迴回去06/22 19:36
22F推: 左邊跟左邊比,右邊跟右邊比啊06/22 21:05
23F→: 下面那一堆第一個C接C,H,H,COOH第一個C接O,O,O,O原子06/22 21:07
24F→: 序比C大所以贏06/22 21:07
25F→: 左邊的上面第一個原子就是O,就贏下面的C了06/22 21:08
26F→: 左右都是上面贏,所以是Z06/22 21:09
27F→: 另一個雙鍵就沒問題,碳比氫大,溴比氯大,所以是E06/22 21:10
1F推: 鍵能是斷鍵需要吸收的能量,形成鍵結是放熱,sigma鍵的05/29 21:38
2F→: 鍵能高,所以形成時放熱比pi鍵斷裂吸熱多,整體反應自然05/29 21:38
3F→: 是放熱的05/29 21:38
1F推: 碳的電負度低於鹵素,帶負電自然比較不穩定而喜歡攻擊親05/02 10:29
2F→: 電試劑囉!05/02 10:29
5F推: 4跟5都上去之後就對稱了,3跟6變成完全一樣04/30 11:11
6F→: 原本4/5也是一樣的04/30 11:11
7F→: 所以一開始是4/5其中之一先上,接著其中另一個上04/30 11:12
8F→: 4、5都溴化之後換3/6其中之一,最後四個都接滿04/30 11:13
7F推: 用Grignard用的那種鎂屑,加一點點碘,氮氣下烤一下來活04/26 15:42
8F→: 化,然後加乙醇進去蒸餾。04/26 15:42
9F→: 接收瓶直接放烤過的3A分子篩。這樣可以拿到滿乾的乙醇。04/26 15:43
5F推: 我覺得加到有過量溶質沈澱之後,過濾,再分析飽和溶液的04/24 11:44
6F→: 濃度會是比較好的辦法04/24 11:44
7F→: (如:烘乾或抽乾後稱重、滴定、HPLC...等)04/24 12:05