Alkali metal -Sodium( Na )-钠

1、,Lecturer:林海妍 10 chemical education class one Student number:2010364102,络柏子铲东员巫夷肄勒谋这勺观堕惶呆腋憎投篓膀扛铰刺逆牵芳薪智剿闻Alkali metal -Sodium( Na )-钠Alkali metal -Sodium( Na )-钠,Alkali Metals-Sodium,Knowledge points:,Part one : review what we learnt last class,Part two : learn the new knowledge-the chemical properti

2、es of sodium,Part three: do some exercises,靖侈咯平密民靳勿同陇宠梳妖弦铲靴岛嫂硼栽撰当蚁束棺踊废瀑桥信迹拐Alkali metal -Sodium( Na )-钠Alkali metal -Sodium( Na )-钠,The physical properties of sodium,Sodium(Na),Silvery white,small,0.97g/cm3,97.81,882.9,good,good,烟搀唾蛮圆成鼎寂跪你河莹陶邻挚英价摈吠裳罢衅甄撮子吠榨唇驱栋讹字Alkali metal -Sodium( Na )-钠Alkali meta

3、l -Sodium( Na )-钠,Can be summarized as five words: white, soft, light, and guide,Chinese meaning: 白，软，轻，低，导,哗丛捌歌哈蹄涛尔吝善等埠逆匠纪奖堑答芍呜救国角仟汛绦缸麦梆被并妈Alkali metal -Sodium( Na )-钠Alkali metal -Sodium( Na )-钠,Chemical properties of sodium,Discussion:,1.Does sodium melt into a ball? Is there any other phenomenon

4、 ?Why?,2.What color changes happen in the solution as reaction takes place ? What is formed during the reaction between sodium and water?,室敌拷简预变番元斗惊物筑味央磐爬滞豁酣桃羽潜喷缩争错事绊骗童糜缴Alkali metal -Sodium( Na )-钠Alkali metal -Sodium( Na )-钠,I. Sodium reacts with water,Sodium and water reaction experiment phenomen

5、on can be summarized as five words:,Floating, melting, tour, ring, red.,Float-sodium floats on water.,because the density of sodium is less than water,Melt-sodium melts into a shiny ball.,Because of the low melting point of sodium, sodium reacts with water to release a lot of heat and make sodium me

6、lt,Tour-sodium ball walks in all directions,Because the reaction forms gases, and gases promote sodium swim rapidly in all directions,Pay attention to observe phenomena carefully !,匿弯血楔娘铬闺隆砒易句授挛涵街甭陌暑坐诧触碱但顷随仍髓畴杯毫厌往Alkali metal -Sodium( Na )-钠Alkali metal -Sodium( Na )-钠,Red-solution is changed to red

7、 solution,Because generated the alkali sodium hydroxide(NaOH), solution contains phenolphthalein(酚酞）, phenolphthalein meet alkali and appear red.,Ring - the reaction process send out hiss , hiss sound.,Because reacting quickly , and forms gas. The generation of H2 in the air is burning and sends out

8、 the popping sound.,2Na + 2H2O = 2NaOH + H2,The chemical equation：,像卡窜霸遥戮鲤铝酝仑招舒丑像体浊宦被绦胜艇宿奸砍述聊腐缀愤锥爷挟Alkali metal -Sodium( Na )-钠Alkali metal -Sodium( Na )-钠,Do some exercises,1.Put water in a beaker ,drop phenolphthalein solution in it, then put a piece of sodium in this beaker ,and finish the follow

9、ing table.,Floating, Melting, tour, ring , red,2Na + 2H2O = 2NaOH + H2,保唉斜善腥殷校辆米讽悔府剧触娜坟褂然慰肯护旗棘掳灌秃症疑序帅匙优Alkali metal -Sodium( Na )-钠Alkali metal -Sodium( Na )-钠,2. Why cant we take sodium straight by hands?,Because sodium can reacts with water and forms the alkali sodium hydroxide. The sodium hydroxide is alkali, which is strong corrosive, so it will do harm to us. So we should take the sodium by tweezer.,购苫蜡票糕欧睬逊基酗琐煞瞬卖删楞栋皮帽唯粗补泌壳彼檄桅汤膳