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单词 SN2
释义

SN2

英语例句库

Nonsoluble nitrogen (NSN) and soluble nitrogen (SN) in ten tobacco samples were determined with a flow analyzer.

采用流动分析法测定了10种烟草中的不溶性氮和可溶性氮。

The orebody is controlled by SN, NW faults and fissures, the ore deposit belongs to magmatic hydrothermalism-stratabound and compound magmatic hydrothermalism type one.

矿体受南北向、北西向断裂及裂隙构造控制,矿床成因为岩浆热液—层控与岩浆热液复合型。

原声例句
科学60秒 听力 2013年1月合集

Such was also the case for an object called SN 2009ip.

这种情况也出现在一个叫做“SN 2009ip”的飞行物上。

科学60秒 听力 2013年1月合集

Following two subsequent flare-ups, astronomers have now concluded that SN 2009ip has gone supernova at last.

接着又发生两起爆炸现象,宇航员总结道:最终 SN 2009ip 还是变成了超新星。

当月 CNN 10 学生英语

We had the kitchen sink essentially thrown at us the other day on an SN sim, and we came out fine.

前几天在一次SN模拟测试中,厨房水槽基本上是朝我们砸了过来,但结果没什么问题。

老爸老妈的浪漫史视频版(第五季)

Let's do it again, sn. - Yeah, we'll call you.

改天再聚 - 嗯 我们会打你们电话。

经济学人-科技

SN8 is, as its name suggests, the eighth in the current series of prototypes for SpaceX's proposed Starship (SN stands for " serial number" ).

正如它的名字所示,SN8是SpaceX目前计划中的星际飞船系列原型中的第八艘(SN代表“序列号”)。

中文百科

双分子亲核取代反应 SN2 reaction

(重定向自SN2)
CH3SH与CH3I发生SN2反应的球棍模型示意图。
SN2反应过渡态的结构。

SN2反应双分子亲核取代反应)是亲核取代反应的一类,其中S代表取代(Substitution),N代表亲核(Nucleophilic),2代表反应的决速步涉及两种分子。与SN1反应相对应,SN2反应中,亲核试剂带着一对孤对电子进攻具亲电性的缺电子中心原子,形成过渡态的同时,离去基团离去。反应中不生成碳正离子,速率控制步骤是上述的协同步骤,反应速率与两种物质的浓度成正比,因此称为双分子亲核取代反应。

在无机化学中,常称双分子亲核取代反应类型的反应机理为“交换机理”。

英语百科

SN2 reaction 双分子亲核取代反应

(重定向自SN2)
Ball-and-stick representation of the SN2 reaction of CH3SH with CH3I
Structure of the SN2 transition state
SN2反应过渡态的结构。

The SN2 reaction is a type of reaction mechanism that is common in organic chemistry. In this mechanism, one bond is broken and one bond is formed synchronously, i.e., in one step. SN2 is a kind of nucleophilic substitution reaction mechanism. Since two reacting species are involved in the slow (rate-determining) step, this leads to the term substitution nucleophilic (bi-molecular) or SN2, the other major kind is SN1. Many other more specialized mechanisms describe substitution reactions.

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更新时间:2025/6/21 6:46:31