1、Section 1, Chapter 7,Solution 溶液,Jiangdu International School Wang Yong 12/10/2003,在日常生活中,你已经知道哪些物质能分散到水中?请思考并与同学交流,探究活动一: 将少量下列物质分散在水中，会发生什么变化？ 请注意取用药品操作的规范。,soluble,soluble,soluble,What Happens During Solution?,Dissolution of an NaCl crystal in water,Water molecules surround the individual sodium
2、and chloride ions at an exposed edge or corner, pulling them from the crystal surface into solution and surrounding them.,Wine Is a Solution of Dissolved Molecules,怎样才能较快地溶解某些固体物质？,建议1：溶解时不断搅拌、振荡,建议2：加热、升高温度,建议3：将块状物质研碎,Solution A homogeneous mixture composed of a solute and a solvent,Solute The sub
3、stance which is dissolved,Solvent The substance which acts as the dissolving medium,溶剂常被视为溶液的最大成份，但有例外，例如98%的浓硫酸溶液是被2%的水(溶剂)所溶解。,Usually a solvent is the largest component in a solution, but there are exceptions. In concentrated sulfuric acid, for example, the sulfuric acid is 98 percent of the solu
4、tion dissolved by 2 percent of water.,A solution with water as the solvent is called an aqueous solution. 以水为溶剂的溶液称为水溶液。,还有一些非水溶剂的溶液,交流与讨论一,无色透明的液体都是溶液吗？,溶液都是无色透明的液体吗？,Types of solution （溶液的类型）,Gaseous solution （气体溶液）： 气体气体,Liquid solution （液体溶液） 液体气体、液体液体、液体固体,Solid solution （固体溶液）：,The properties
5、and application of solution （溶液的一些性质和应用）,物质溶于水时通常伴随热量变化。,物质溶于水，使水的沸点升高，凝固点降低,很多溶液有导电性,交流与讨论二,物质分散在水中都能形成溶液吗？,探究活动二:将少量下列物质分散在水中，会发生什么变化？请注意药品取用操作的规范。,It is not easy to dissolve,It is not easy to dissolve,insoluble,Emulsify （乳化）,用洗衣粉可以洗去衣服上的污渍，用洗发精可以洗去头发上的油脂你知道是什么原因吗？,灰尘、油脂难溶于水，在它与水的混合物中加入一些洗洁精，能使油脂以
6、细小的液滴均匀悬浮在水中，形成较稳定的乳浊液。这种现象叫,探究活动三:,在试管中加入mL水（或者醋），用滴管向试管中加入2滴食用油和数滴洗洁精，用橡皮塞塞紧试管，振荡片刻，静置，会发生什么变化？试提出可能的假设，然后通过实验加以证实，并与探究活动一、二的有关现象比较。,Milk is a colloid with fine particles that do not separate out on standing.,An aerosol spray, by contrast, is a heterogeneous mixture of small particles visible to t
7、he naked eye.,Colloid （胶体）,Tyndall effect: ability of a Colloid to scatter light. The beam of light can be seen through the colloid.,Class-exercises,想一想, 本节课你学到些什么?,Which aqua have we known?,The properties and application of solution,The concept of Solute Solvent and Solution,The mixture of the similar aqua,Homework,Textbook P134 3.(1)(2) P147 1.(1)(2) 2.(1)(2),Thanks,http:/ ,
