Date: Sat, 31 May 2014 01:56:57 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--206B855A9B29BF6D045D019A2D5F9A42_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
Date: Sat, 31 May 2014 01:56:57 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--206B855A9B29BF6D045D019A2D5F9A42_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
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Date: Sat, 31 May 2014 01:56:08 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--065C2954B8A70828B0FA9963CA5FC641_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
常见化学符号的规范性应用一元素1.元素的定义:具有相同核电荷数(即核内质子数)的同一类原子的总称决定元素种类的是:核电荷数(核内质子数) 决定元素化学性质的是:原子的最外层电子数2.常见的元素符号:前20号元素: 3.元素符号的意义宏观:一种元素(只论种类不论数目) 微观:一个原子(既论种类又论数目) 【例1】符号Cl的意义是什么【例2】符号2Cl的意义是什么4.应用物质的分类二化学式1
物质构成的奥秘常用的化学符号(元素、化学式)【练习】练习1:现有下列物质①氧气;②氢气;③河水;④镁;⑤氧化镁;⑥空气;⑦水;⑧高锰酸钾;其中属于单质的是____。属于化合物的是_____。属于氧化物的是_______。属于混合物的是_____。练习2:下列各组物质中,前者是化合物,后者是单质的是( )A.高锰酸钾,氮气B.洁净的空气,氧气 C.铝,二氧化碳D.硫粉,氧化镁练习3 :下列物质中
Date: Sat, 31 May 2014 01:58:09 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--5040C1A4A7F4439C4AAC6E3AE158AA2A_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
Date: Sat, 31 May 2014 01:58:09 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--5040C1A4A7F4439C4AAC6E3AE158AA2A_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
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