42中讲稿ppt-南京晓庄学院(1)

1、Chemistry DepartmentNanjing Xiaozhuang College Long Qi 1Finish the chemical euqation , please S + O2igniteSO2 ?点燃2Sulphur Dioxide 3Whats SO2 like?4Lets observe a bottle of SO2Lets share the information and ideas观察5Physical properties 67Physical Properties State: Odour : Colour :Boiling point:Solubil

2、ity: Density :gasirritantcolorless/pungent/suffocating/ faint sweetish / colorless liquid ( when T -100)-10oc, easy to liquefysoluble heavier than the airAt room temperature VSO2:VH2O = 40:1/2.5 times as heavy as air状态气味沸点溶解度密度物理性质8What chemical properties does SO2 have?9Lets guess !101、like CO2 , S

3、O2 is an acidic oxide , then ?Guess from the valence of S: +6 +4 0 SO2Be oxidedBe reducedCl2, Br2, O2, KMnO4, HNO3H2SSO2 + Br2 + 2H2O = +H2SO42HBr酸性氧化物化合价被氧化被还原11Lets observe some experiments !12二氧化硫与水的反应.zip Experiment 1 131. Reaction with water - a property as an acidic oxide SO2 + H2O H2SO3 rever

4、sible reaction Chemical Properties 化学性质可逆反应14Lets share the information and ideas！1516a) Collect water samples from around your home and school. You may collect water from all types of sources, like rain, lakes, snow, tap water, etc. Make sure you store your samples in clean glass jars (well rinsed,

5、 without any soap residue).b) Label each jar with: the date the sample was collected the source (such as, river, rain, puddle, snow) where and how it was collected the time of day it was collected c) Check the pH level of each water sample. Be sure to check your samples as quickly as possible after

6、you have collected them.17 d) Record the pH levels in a chart that looks something like this: e) Map your results: Draw a map of your area and record the pH level results on the map. Be sure to write the dates beside the levels so you can compare your results later on. f) Optional next step: In the

7、next Season, repeat the experiment by collecting water samples from roughly the same locations and recording your results on a chart like the first one. What changes in the pH occurred, if any?Date and time collected SourceWhere the source is fromHow it was collectedpH level182.Reaction with oxygen

8、- a property as a reductant 2SO2+O2 2SO3 SO3 + H2O = H2SO4 The above reactions are used in the industrial production of H2SO4 High pressure, temperatureCatalyst A colorless solid, m.p:16.80b.p: 44.80还原剂工业生产催化剂19二氧化硫的漂白性.zip Experiment 2203.Bleaching Function decolorize the magenta solution , forming

9、 colorless and unstable compounds. The bleaching function is temporary.漂白性品红溶液使褪色化合物暂时的不稳定的21New straw hat Old straw hat The new one is bleached by SO2 , forming an unstable colorless compound, so the new one is in light color. The unstable colorless compounddecomposes and restore the orginal color

10、，so the old one is in dark color恢复原来的颜色浅色深色22Lets share the information and ideas！23人民网24Chemical properties 2526Use your head ! State other bleaching agents and compare them2728永久性漂白暂时性漂白29Lets summarize the chemical properties of SO2 !小结301. Reaction with water SO2 + H2O H2SO3 reversible reaction

11、2. Reaction with oxygen 2SO2+ O2 2SO3 3.Bleaching Function High pressure, temperatureCatalyst 31Group Activities32What chemicals could you use to distinguish SO2 from CO2?在实验室用装置制备某气体时会发生副反应，生成二氧化碳、二氧化硫、水蒸气，请用下列装置设计一个实验，以验证上述混合气体中是否含有二氧化碳、二氧化硫和水蒸气 33 （1）装置中加的固体药品是 _，以验证混合气体中含有的_ 装置中盛有的溶液是 _， 以验证混合气体

12、含有 _三种气体的验证顺序为 _， _， _。（2）连接上述装置以验证混合气体中含有CO2、SO2和水蒸气的顺序是（填各仪器接口的代码字母）：（ ）接（ ）（ ）接（ ）（ ）接（ ）（ ）（3）实验时装置中Q瓶内的现象是 _，结论是_ P瓶中的现象 _， P瓶溶液的作用_ 若K瓶中的品红溶液不褪色，可得到的结论是_无水CuSO4水蒸气澄清石灰水二氧化碳水蒸气二氧化硫二氧化碳GEFFEDCBA颜色褪去混合气中含有二氧化硫溴水褪色吸收二氧化硫二氧化硫已经除尽34Is SO2 useful to us or not?35Uses of SO2Bleach paper pulp, wool, sil

13、k, and straw products Kill the mold and bacteria纸浆草制品霉菌细菌36But !37The polluted cities 38The formation of international acid rain 酸 雨形 成39The statue eroded by acid rain雕像被腐蚀的40The trees are being destroyed by acid rain 被破坏的41Lets share the information and ideas！42434445The harmful effects on peoples

14、health影响46The sky should have been blue!47What shall we do?48CHINA , 1998Main resources: factoriesResources of SO2来源4950Do you want to know how much SO2 is in the air around you? 51Use your head Design an experiment to measure the concentration of SO2 in the air around you.设计测量浓度52 Compare with the following table, does the concentration of SO2 in the air around you ex