1、 双语文件E/11/2007 学生材料/ 教案（化学学院、董坤） 页 1 / 7化学（07 级双语）Chemistry (07 Bilingual)教 案Teaching Plan姓名董坤化学学院College of Chemistry双语文件E/11/2007 学生材料/ 教案（化学学院、董坤） 页 2 / 7Primary Department Subject chemistryClass 3 Grade 3Preparing Time 45min Date 2010 .06 .13 By 董坤 NAME OF LESSON Chapter 12.1 Group(AS)POINTS OF
2、EMPHASIS Physical and chemical properties of Group .POINTS OF DIFFICULTY(1) Chemical properties of Group,especially displacement reactions.(2) The rules change with increasing atomic numbers.AIMSKnowledge and Technology: (1) Understand and explain the physical and chemical properties of Group,especi
3、ally chlorine,bromine and iodine.(2) Describe the relative reactivity of the elements Cl2, Br2 and I2 in displacement reactions and explain this trend in terms of oxidising power,i.e. the relative ease with which an electron can be captured.(3)Describe and explain the reactions of the elements with
4、hydrogen.Process and Method: The students will be able to understand the rules with increasing atomic numbers and develop the capability of observation.Emotional attitudes and views: (1) Stimulate students interest in learning chemistry. (2) Through the study of properties of Group,develop their sel
5、f-learning ability.NEW WORDSHalogen 卤素 derived 源于 Greek 希腊语 term 术语 pale 苍白 greenish 绿 crystalline 透明的 sublimes 升华 purple 紫色 vapour 蒸气 isotopes 同系物 radioactive 放射性 deepen 加深 outermost shell 最外层 general formula 通式 halide 卤化物 hypohalous 次卤化物MATERIALS Multimedia computer, test book of A-LEVELPREPARATIO
6、N PowerPoint双语文件E/11/2007 学生材料/ 教案（化学学院、董坤） 页 3 / 7PROCEDURESActivity 1(minutes)Teacher Hello my dear friends!Students Hello teacher.Teacher OK. Before our class begins. I want to introduce a famous person named Lu Su,who worked for Sun Quan as a strategist in Eastern Han.He was dead at the age of 4
7、6.In this lesson we will meet a new name .Its pronunciation is familiar with its chemical name in Chinese.Its halogens.Chinese mean of halogen is Lu Su ,too.They have seem pronunciation but stand for different things.Its a new name for us,so read after me please!Halogen!Halogen!Students Halogen, Hal
8、ogen!Teacher The name halogen is derived from the Greek and means salt producing. It was first used to the beginning of the nineteenth century because chlorine,bromine and iodine are all found in the sea as salts.Nowadays we still use the term.The elements of Group are called the halogens,so the top
9、ic today is Group.Writing on the blackboard Chapter 12.1 GroupTeacher Look at a part of periodic table of the elements.How many elements are in Group?Who can tell me?You please!Students Five.Teacher Good job!There are five elements in Group.What are they?Students (answer question)They are fluorine,
10、chlorine, bromine, iodine and astatine.TeacherOK. Look screen now please! Read after me. Fluorine, chlorine, bromine, iodine, astatine!Activity 2(minutes)Teacher Fluorine, chlorine, bromine, iodine, astatine!Teacher OK.From the table of Group,we can know their atomic number increase.So how will thei
11、r physical properties and chemical properties change with increasing atomic numbers?Lets learn the first part: physical properties of Group.Writing on the blackboard .Physical propertiesTeacher I will give you five pictures.Now look at these pictures and who can tell me their physical properties wit
12、h increasing atomic numbers?You please!Writing on the blackboard a.With increasing atomic numbersStudents First picture is a pale yellow gas,it is fluorine.Chlorine is a greenish yellow gas/Bromine ,dark red liquid/Iodine is purple.Astatine is a dark solid.Teacher Well done!I will give you right ans
13、wers.Fluorine is a pale yellow gas.Chlorine is a greenish yellow gas.Bromine is a dark red liquid giving off a dense red vapour.Iodine is a shiny,grey-black crystalline solid which sublimes(changes directly from a solid to a 双语文件E/11/2007 学生材料/ 教案（化学学院、董坤） 页 4 / 7gas)to a purple vapour.Astatine is a
14、 solid,too.All the isotopes are radioactive and so this element will not considered here.So according my introduction,we can know two points about physical properties with increase atomic number of Group. What are they?StudentsColour change/States from gas to solid.Teacher OK!Very good!With increasi
15、ng atomic numbers the colour deepens and States from gas to solid.Writing on the blackboard i.the colour deepens. ii.States from gas to solid.Next ,lets analysis the table please.What are they?Students Melting point and boiling points.Teacher How their melting points change?Students melting points i
16、ncrease.Teacher What about boiling points?Students Increase,too!Teacher OK,good job!They are all increase with increasing atomic numbers.Writing on the blackboard iii.melting points increase.iv.boiling points increase.Teacher According these pictures we can know their densities increase,too!Writing
17、on the blackboard v.densities increase.TeacherThe halogens are a family of non-metallic elements.So they are non-metals .Writing on the blackboard b.they are non-metals.Teacher OK. So much for the physical properties of Group.Please look at the screen. According to their atomic structures we can kno
18、w there are 7 electrons in the outermost shell.As a result ,the most common oxidation state for the halogen is negative one(-1).We shall not include fluorine in all the discussions,because its small size and high electro-negativity give it some special properties.The second part,we will learn chemic
19、al properties of Group .Writing on the blackboard .Chemical propertiesTeacher Halogens react with hydrogen to give the corresponding hydrogen halide.Now I will write down an equation on the blackboard.Writing on the blackboard a.react with H2 Cl2 + H2 2HClActivity 3(minute)Teacher Next I will ask yo
20、u to come here and write down another equations .Any volunteers?You please!Students (hands up!)Writing on the blackboard Br2 + H2 2HBr , I 2 + H2 2HI.Teacher Another students write down on your note book, and I will check your answers later.If you have any questions,hand up please!(several time late
21、r)Thank you very much!Go back to your sit please!Is he/she right?Students Yes!双语文件E/11/2007 学生材料/ 教案（化学学院、董坤） 页 5 / 7Teacher Good job!You are right(big hands)! You can check your answers on the screen.From these three equations,we can know the general formula!Writing on the blackboard X2 + H2 2HXTea
22、cher Halogens react with water to give the corresponding hydrogen halide and hypohalous acid.Now I will write down an equation on the blackboard.Writing on the blackboard b.react with H2O Cl2 + H2O HCl + HClOTeacher Next I will ask you to come here and write down another equations .Any volunteers?Yo
23、u please!Students (hands up!)Writing on the blackboard Br2 + H2O HBr + HBrO I2 + H2O HI + HIOTeacher Another students write down on your note book please! If you have any questions,hand up please! I will check your answers now!(several time later)Thank you very much!Go back to your sit please!Is he/
24、she right?Students Yes!Teacher Good job!You are right(big hands)!From these three equations,we can know the general formula! Who can right down the general formula? You please!Students (hands up!)Writing on the blackboard X2 + H2O HX + HXOTeacher Thank you! Is he/she right?Students Yes!Teacher You d
25、id a good job(big hands)!You can check your all answers on the screen.Next we will learn displacement reactions among chlorine,bromine and iodine.It is very important in this class.I hope everyone can remember the regular clearly!Can you ?Students Yes,I can!Teacher OK,I will give you the rules about
26、 displacement reactions among halogens!Chlorine displalces bromine and iodine.Bromine displaces iodine. Iodine dose not displace either chlorine or bromine.I will right down the left of the equation about chlorine displaces bromine.Writing on the blackboard c.displacement reactions Cl2 +Br- TeacherA
27、ccording to my introductions,Who can come here and right down them?Any volunteers?Students Cl2 + Br- Cl - + Br2Teacher Is he/she right?Students No/Yes!Teacher Yes or no?Yes?Students No!双语文件E/11/2007 学生材料/ 教案（化学学院、董坤） 页 6 / 7Teacher We must remember atomic number equal in order to keep the equation b
28、alance.So there are two bromide ions join this reaction and two chloride ions produced in this equation.The right answer is Cl2 + 2Br- 2Cl - + Br2.Are you clear?Students Yes!Writing on the blackboard Cl2 + 2Br- 2Cl - + Br2Teacher Next I will ask you come here and help me with complement another equa
29、tion. Any volunteers? You please!Writing on the blackboard Cl2 + 2I- 2Cl - + I2 Br2 + 2I- 2Br - + I2Teacher Thank you! Is he/she right?Students Yes!Teacher Well done (big hands)!From these three equations,we can analysis their elements oxidizability and ionic reducibility.Who can tell me the element
30、s oxidizability?Students Elements oxidizability:Cl2 Br2 I2.Teacher Thank you! Is he/she right?Students Yes!Writing on the blackboard Elements oxidizability:Cl2Br2I2Teacher How about ionic reducibility?Students Ionic reducibility: I-Br-Cl-.Teacher You are very clever! Oxidizability of elements is on
31、the left more than right. Ionic reducibility is negative.Are you remember them?Students Yes!Writing on the blackboard Ionic reducibility: I-Br-Cl-Teacher So much for our lesson.Well learn more about the chemical properties in next lesson and learn them more detail. Now lets review this lesson. Today
32、 we have learnt the physical and chemical properties of Group .Their color deepens,states,melting and boiling points,densities are all increase with increasing atomic numbers. Ionic reducibility increase, too. But elements oxidizability decrease with increasing atomic numbers. Displacement reactions
33、 among halogens are points of difficulty in this lesson. Pay attention to the displacement reactions. The home works are everyone can remember them in order to prepare learn new knowledge next lesson and then do some exercises after class. Thank you for listening. Class is over.See you next time!Stu
34、dents See you!双语文件E/11/2007 学生材料/ 教案（化学学院、董坤） 页 7 / 7Notes板书设计Chapter 12.1 Group .Physical propertiesa.With increasing atomic numbersi. the colour deepens. ii. States from gas to solid.iii.melting points increase. iv. boiling points increase.v. densities increase.b.they are non-metals.Writer: 董坤_ .C
35、hemical propertiesa.react with H2Cl2 + H2 2HClBr2 + H2O HBr + HBrOI2 + H2O HI + HIOX2 + H2 2HXb.react with H2OCl2 + H2O HCl + HClOBr2 + H2O HBr + HBrOI2 + H2O HI + HIOX2 + H2O HX + HXOc.displacement reactionsCl2 + 2Br- 2Cl - + Br2l2 + 2I- 2Cl - + I2Br2 + 2I- 2Br - + I2Elements oxidizability:Cl2Br2I2Ionic reducibility: I-Br-Cl-
