海水提溴（Sea water bromine extraction）.docVIP

海水提溴（Sea water bromine extraction） Sea water bromine extraction Teaching model Guiding Inquiry Teaching Mode Two, teaching objectives: 1. make students understand the rich resources in the ocean. 2. guide the students to get the basic process of extracting bromine from sea water. 3. the principle of replacement reaction between the students to understand and draw the change rules of halogen, halogen properties. Three, teaching key points and difficulties: Key point: basic process of extracting bromine from sea water Difficulty: the phenomenon of substitution reactions between halogens and the analysis of oxidation reduction reactions Four 、 teaching process []2004 on Christmas Eve, a tsunami in the India ocean, just a few minutes to the minds of the resort destroyed badly, the brief tsunami by the outbreak of the energy is not less than a few atomic bomb can release energy, visible Haiti deep people immeasurable energy, if the human will make good use of it, it will also be benefited. [questions] students know what resources the oceans can bring us [introduction] brief introduction of marine resources. First, the sea water can be used directly The direct use of seawater is mainly in three aspects: industrial cooling water, large living water and low salinity seawater irrigation crops. Two, the marine interior contains many biological resources. It is estimated that 80% of the biological resources on the earth are in the ocean. It has been calculated that, without destroying the ecological balance, the ocean can provide 30 tons of aquatic products every year, and it can feed 30 billion people. Three, the seabed is rich in oil and gas resources. According to estimates in 1995, the worlds offshore oil reserves proved to be 379 tons, and the reserves of natural gas were 39 trillion cubic meters. According to incomplete statistics, the submarine reserves of oil and gas reserves account for about 1/3 of the worlds oil and gas reserves. Four, the ocean is the storehouse of