氢氧化钠 UN NO.

相关推荐

• 化学水解问题蒸干碳酸钠,剩余固体为什么是碳酸钠?我觉得碳酸离子两次水解得到碳酸,加热碳酸挥发,促进水解,最后剩余固体为氢氧化钠.
• 用水鉴别物质有一定的规律,掌握其规律会使学习更轻松.现有四种白色固体,分别是氢氧化钠、硫酸铜、氯化钠、碳酸钙,只提供蒸馏水,将其鉴别开⑴、根据是否溶于水可鉴别出 .⑵、根据溶于水时形成蓝色溶液,可鉴别出 .⑶、将溶于水时形成无色溶液的两种物质分为一组,根据溶液温度 （填“升高”、“降低”或“不变”）可鉴别出 .
• 英语翻译We verified the Google inside the document which has 2 items corporate cards:3P103,3B107 we have in September 21st and 26 were sent to Atlanta and Geneva.32561,32562,32563,32564,32565,we can't find product code in master data,we has been send to ATL and UN the product code is 36561,36562,36563,36564,36565 and 32705 we have in September 29 were sent to Atlanta and Geneva.Please help to confirm.32991 puzz card we has been send out mockup samples to
• 英语阅读表达 跪求答案! My mother used to ask me what is the most important part of the body.When I was younger, I thought sound was very important to us as humans, so I said, "My ears, Mommy." She said, "No. Many people are deaf. But you keep thinking about it and I will ask you again soon." Several years passed before she asked me again. Over the years, Mother asked me a couple more times and always her answer was, "No, but you are getting smarter every
• 下列物质敞口放置在空气中一段时间后，因发生化学反应质量增加的是（　　）A. 碳酸钙B. 浓硫酸C. 浓盐酸D. 氢氧化钠
• 化学元素的符号有什么规律?比如氧是O,是氧气就变成O2了,为什么?再比如：石灰水Ca(OH)2是 氢氧化钠是Na(OH) 为什么一个OH有2 ling 另一个OH没?化合价是什么 具体说明一下
• 求改英语作文.In 1895,UN announce that it is International Volunteers Day on 12.5 every year.So,it is necessary for us to know what is volunteer.The volunteer is that a person do something for another who need help.Of course,we support them for free.Briefly,We should be helpful to people.Now,we need to know something about the spirit of volunteer`s sever.First,they should have skill and willing to help people.Second,we must be honest and goodness.Last but no
• 我们已经学习和掌握了很多物质，并进行了分类.下列各组内物质表示同一种物质的是（　　）A. 冰、干冰B. 氢氧化钙、消石灰、生石灰C. 盐酸、氯化氢、食盐D. 氢氧化钠、烧碱、火碱
• No. Your hair is long是什么意思
• 英语:请用12个词填空.HURRY UP Word:an apple,an egg,a tomate,apples,tomatoes,eggs,sugar,milk,tea,chicken,cake,cheese.write:‘You must lose weight,'my doctor said to me,‘You mustn't eat( ).They're bad for the heart.'‘Can't I have( )for breakfast sometimes?'‘No.'my doctor said.‘And you must drink( )without( )and without( ).'‘What can I eat?'I asked.‘You should buy a( )occasionally.And( )are good for you.They're particularly good for your teeth.Remember:"An( )a day
• 西周分封了多少个诸侯国?
• 二进制数1011010扩大两倍和缩小两倍各是?