Physical properties of ammonia
(氨气的物理性质)
1教学内容
Physical properties of ammonia
2学生情况
They had learned about the properties of nitrogen oxide and know the nitrogen has different valences.
3教学目标新时代美容学校
Master the physical properties of ammonia.
4教学难重点
Physical properties of ammonia.
5专业术语
ammonia （氨气） solubility(溶解度)
relative molecular mass (相对分子质量)
Nitrogen dioxide (NO2)
葡萄牙语学习6教学方法
Lecture and power point
7教学材料
only的意思The chapter 4 in the first quarter of the compulsory chemistry one.
8教学过程
(1)准备:写板书 4.1 Physical properties of ammonia
(2)过程
①引入：
Class begin, we had learned about the properties of nitrogen oxide and know the nitrogen has different valences. Today we are going to learn the most lowly charged compound of nitrogen ---ammonia.
②阐述：
[teacher]:
Look at this picture, this is a bottle of ammonia, plea obrve its color and state.
放弃的英文
Who can tell me the color and state of ammonia?
[student]:
It’s a kind of colorless gas.
[teacher]:
codecademy
Very good, sit down. The state of ammonia is gas and the color of ammonia is colorless. Now , plea read the last paragraph of the page ninety-ven.
Any volunteer?
[student]:
It has pungent odor and can be dissolved in water very easily.
aftereffect
[teacher]:
Yes ,the smell of ammoniaugly是什么意思 is pungent and it can be dissolved in water very easily.note是什么意思 One volume of water can be dissolve 700 volumes of twinammonia at normal temperature and pressure. We had learned nitrogen dioxide and know nitrogen dioxide is easy to liquefy.
Now , plea think about if the ammonia is easy to liquefy or not?
[student]:
The ammonia is easy to liquefy.
[teacher]:
Your answer is right. The ammonia is easy to liquefy. carbonaraIt can absorb a large amount of heat when gasified. So the ammonia of liquid state is usually ud as refrigerant. Next we will learn the last physical properties of ammonia ---density. We can know that the density of ammonia is lighter than that of the air by comparing with relative molecular mass.
(3)结束
[teacher]:
This is your homework for this weekend, plea preview experiment of fountain and think about the questions :
①The reason of forming fountain..
②Do you know any other gas can form a fountain.
③The solution turns red, why?
