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化学
内容:这里也能查到合成方法: XXXXXXXXXXXXXXXXXXXXXXX/chemical/50456 92.25g(0.5mo1)(S)-2-氨基-4-甲硫基丁酰胺溶于600ml二氯甲烷,在室温加入84g无水硫酸
钠
。
连载:部分实验仪器的使用方法(请大家多多补充)
虎哥
17年0个月前
发表于
化学
内容:例如:实验室制硝酸时,可从塞口先放入固体硝酸
钠
,再由此加入适当浓硫酸、塞紧瓶塞,微热,蒸出的硝酸蒸气直接由曲颈进入接受器,同时冷凝为液体。,使用注意事项 (1)贮气瓶等所有容器类玻璃仪器通常都采用耐热温度不高的
钠
钙玻璃(俗称白料)加工成型,形状各异且器壁厚薄又不均匀,所以不能加热,使用时也切忌骤冷骤热。,因为试剂瓶只用作常温存放试剂使用,一般都用
钠
钙普通玻璃制成。
朱棣文在加州理工2009毕业典礼的演讲
pooseo
13年4个月前
发表于
科学技术学
内容:Crookes爵士在英国皇家学会主席的就职演说开头警告道:“英国以及整个文明世界将要面临灭顶之灾” ,因为当时的农作物轮作以及粪肥并不能满足土壤肥力再生的需要,而用来制造肥料的南美洲鸟粪和智利的硝酸
钠
将会很快耗尽
[原创] 电池漫谈
TBsoft
7年11个月前
发表于
化学
内容:氢气在汞表面逸出的超电势极高(汞阴极法电解食盐水能够在阴极析出金属
钠
并生成
钠
汞齐,主要就是这个原因),因此,为了防止锌电极与电解质反应,过去的方法是,将锌表面汞齐化,这样就能大大降低电池的自放电。
学习单级脉冲感应线圈炮之前你应该知道~
badboy-fly
9年5个月前
发表于
电磁炮
内容:对于单级脉冲感应线圈炮一般的都会以铝、铜、
钠
等,非铁磁性导体作为电枢。
连载:部分实验仪器的使用方法(请大家多多补充)
落叶兄
10年6个月前
回复于
化学
内容:注意:称量物放在左盘,砝码按由大到小的顺序放在右盘,取用砝码要用镊子,不能直接用手,天平不能称量热的物体, 被称物体不能直接放在托盘上,要在两边先放上等质量的纸, 易潮解的药品或有腐蚀性的药品(如氢氧化
钠
固体,B:酸液不慎洒在桌上或皮肤上应用碳酸氢
钠
溶液冲洗。
实用金属表面处理技术
全能杀手
17年6个月前
回复于
化学
内容:原文看不清语序和某些字.)零件可在180-200℃加热2-3h脱氢.盐酸浓度在20%以上时,基体金属腐蚀速度远大于氧化物溶解速度.一般用15%的溶液.硝酸根会参与阴极反应影响镀镍.在一般快速镀镍,光亮镀镍中为了减少
钠
离子的影响
有没有阴极腐蚀、电解液呈还原性的原电池?
TBsoft
8年9个月前
回复于
化学
内容:氢气在汞表面逸出的超电势极高(汞阴极法电解食盐水能够在阴极析出金属
钠
并生成
钠
汞齐,主要就是这个原因),因此,为了防止锌电极与电解质反应,过去的方法是,将锌表面汞齐化,这样就能大大降低电池的自放电,例如过去常在干电池的电解质中加入少量
奶粉算什么,食品还有安全的吗?
mass_lynnxy
16年3个月前
回复于
科学技术学
内容:老板:对用料不一样淋巴都到槽头里去了 亚硝酸
钠
在食品加工中主要作为发色剂和防腐剂使用,它的最大用量为每千克加0.15克,而老板在500斤肉里就加进去了100克亚硝酸
钠
,超过最大剂量的两倍多。,但是老板也知道亚硝酸
钠
加多了不好。 ,在车间的墙脚,记者发现,装着白色片状物的袋子上,赫然写着工业用"氢氧化
钠
"。
金属空心锥形的一些研究与实验
煎鸡蛋
8个月22天前
发表于
机械与工具
动手实践: 实验报导
内容:pvc水管作为壳体,用农机胶加千斤顶把罩子压进去并固定,保障了底部的密封性装药采用400克egdn(乙二醇二硝酸酯)与etn(丁四醇四硝酸酯)的混合物,炸高12cm图一为一瓶纯egdn,底下沉淀的是硫酸
钠
,,优点是不易于电镀液发生反应,脱模非常简单(是用氢氧化
钠
腐蚀铝即可)。
固体火箭版块资源索引(2005-2008)
power_rdx
16年4个月前
发表于
喷气推进
内容:XXXXXXXXXXXX/t/7527现在做完的 XXXXXXXXXXXXXXXXXXXX/t/6610knsu火箭发动机及流行二号火箭 XXXXXXXXXXXXXXXXXXXX/t/6609石膏——硅酸
钠
喷嘴
有机实验基本知识与基本技能问答
虎哥
17年0个月前
发表于
化学
内容:不能造成密闭体系;b.切勿使易燃易爆的气体接近火源;c.使用乙醚等醚类时必须检查有无过氧化物存在,且应在通风较好的地方或通风橱内进行;d.对于易爆炸的固体不能重压或撞击,对于它们的残渣也必须小心销毁;e.注意
钠
屑的放置,答:无水氯化钙、无水硫酸镁、无水里酸
钠
、无水硫酸钙、无水碳酸钾、金属
钠
、分子筛等醇可用无水K2CO3,无水Na2SO4,无水MgSO4,CaO干燥。
CPPO荧光实验与中性核心数据共享
pound_tatp
14年0个月前
回复于
化学
内容:C26H24CL6O8 分子量:677.18 双草酸酯浓度:0.01~0.03mol/L于CPPO CPPO与溶剂:DBP 100mg/ml 溶液A 叔丁醇+过氧化氢:3:2按体积比混合 溶剂B 催化剂:水杨酸
钠
转载,自制铝空气电池
昵称无所谓丫
10年0个月前
回复于
极客DIY
内容:铝空气电池的工作原理:铝空气电池的化学反应与锌空气电池类似,铝空气电池以高纯度铝Al(含铝99.99%)为负极、氧为正极,以氢氧化钾或氢氧化
钠
水溶液为电解质,铝摄取空气中的氧,在电池放电时产生化学反应,
火箭
德阳李
14年10个月前
发表于
喷气推进
内容:氧化剂 最常用的是:过氯酸铵,其他的有过氯酸钾、
钠
、锂,硝酸铵、钾、
钠
、锂2.,添加剂一般有铝粉(镁粉,用来提高燃烧值,金属的燃烧值很高的),铝粉加了就要加氧化剂(同上),抗分解剂(大型火箭的推进剂一般要求十年不变质,其他的也差不多把),安定剂(推进剂的组分不能相互反应把比如二苯胺..氯化
钠
(
电铸锥形铜铃铛制作技术及相关实验
Pj
3个月20天前
发表于
机械与工具
动手实践: 实验报导,严肃内容: 教程/课程
内容:优点是不易于电镀液发生反应,脱模非常简单(是用氢氧化
钠
腐蚀铝即可)。
第四节 近代技术的形成与发展
大仙
16年6个月前
回复于
科学技术学
内容:他先将食盐和硫酸化合得到硫酸
钠
,然后再让硫酸纳与石灰、木炭相作用,从而得到碳酸
钠
,这一制碱法在19世纪上半叶发展很快。
我国大力发展风电的前景分析
creator
19年2个月前
发表于
极客DIY
内容:当前的问题是,我国现在部署的
钠
冷却的快中子堆技术,其增值系数较低,不能满足需求,而较为先进的铅冷却技术却没有掌握。
超级长帖:化学化工词汇英汉对照表
虎哥
16年6个月前
发表于
化学
内容:废酸回收设备acid refractory 酸性耐火材料acid resistance 耐酸性acid salt 酸性盐acid sludge 废酸acid sodium carbonate 酸式碳酸
钠
acid,alabandite 硫锰矿alabaster glass 雪花玻璃alanine 丙氨酸albarium 大理石灰albedo 反射率albertite 黑沥青albertol 阿耳伯特尸albite
钠
长石,dispersion 异常弥散anomalous magnetic moment 异常磁矩anomalous skin effect 反常囚效应anomer 异头物anone 环己酮anorthoclase
钠
斜微长石
现代原子吸收光谱仪器重要部件进展及方法优势互补之述评
虎哥
15年6个月前
发表于
化学
内容:,使相关元素检出限再降低,这种装置(FIAS-THGA Kit)已有供应,这种技术属于流动注射(FI)、氢化物发生(HG)、原子捕集(AT)和现代石墨炉(ETA)四连用;[45] 但氢化物发生属硼氢化
钠
(,例如:钴粉中镍铁杂质;钨钴钛合金中锌锰铁铜镉;铝合金中铅锑铋杂质;易切削不锈钢中铅镉钴;抗菌不锈钢中铜银锌;钨基造粒粉中钴镍铜铁;纯镍中锰镁铜铅 铋锑锌镉铁镍等;钴铬钨中锰铁镍;微晶玻璃中钾
钠
铁铜;钴酸锂电池原材料中
钠
锰铁铜锂镍
天文教材第一卷发布帖
客星晨出东方
1年10个月前
回复于
天文与空间科学
内容:大质量恒星(M>8M☉):大质量恒星与中等质量恒星不同,它们在经过氦燃烧后,中间的碳核心能够被平稳的点火,发生碳燃烧与氧燃烧,形成
钠
,氖,镁,硫,磷,硅等重元素,在核心碳氧也消耗完时,这些碳氧燃烧产生的废料也会燃烧
超声波对硫酸铜结晶的影响
ne555
10年5个月前
发表于
化学
内容:氯化
钠
的晶习是立方体,但水溶液加入尿素杂质可使食盐生长出正八面体的外形。
太阳能科技发展的回顾与展望
1211
19年3个月前
发表于
极客DIY
内容:在太阳能低温贮存中常用含结晶水的盐类贮能,如10水硫酸
钠
/水氯化钙、12水磷酸氢
钠
等。,太阳能高温贮存温度一般在500℃以上,目前正在试验的材料有:金属
钠
、熔融盐等。,鞯
钠
占奥室汛?
各种家庭实验党制备硫酸的方法及总结合集
difemanintrite
1年7个月前
回复于
化学
内容:好使是好使,就是后期有点费手和鼻子,假如你没有戴着浸过碳酸氢
钠
的老式棉口罩的话。
[原创] [挖2006年老坟重新讨论] 2006年的一场争论:酚羟基亲核性是否比醇羟基更强?
TBsoft
11年3个月前
发表于
化学
内容:例如醇
钠
(醇盐负离子)和卤代烃反应可以生成醚(威廉森合成反应),苯酚和碘甲烷在碱性介质中反应生成苯甲醚的反应是典型的威廉森合成反应,完成亲核进攻的是苯酚盐负离子。
自制火箭发动机
冲压发动机
19年0个月前
回复于
喷气推进
内容:药柱配方我推荐一种原料最好找的:30%的柏油,70%的过氯酸钾(过氯酸氨、
钠
也可)。
机械工程关键词汇总——中英文对照
studyboy
19年0个月前
发表于
电子技术
内容:cabinet 高压柜High Pressure Mercury Lamp 高压汞灯high pressure moulding machine 高压造型机High Pressure Sodium Lamp 高压
钠
灯,High Pressure Sodium Lamp 高压
钠
灯high speed belt 高速带high speed boringh 高速精镗high speed cropping machine 高速棒料剪切机,Light Source 光源lighting cable 照明电缆lightning conductor 接地极lime grease 钙基润滑脂lime-sodium base grease 钙-
钠
基润滑脂
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