高一化学必修一第三章第二节.ppt

文档介绍：钠的重要化合物第一课时§ 几种重要的金属化合物 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 火灾现场 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 滴水生火?向包有少量淡黄色粉末的脱脂棉上滴几滴水,观察实验现象。?思考: 为什么会出现这种现象? 滴入水 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 一、氧化钠和过氧化钠 1、过氧化钠 Na 2O 2 2Na + O 2 = Na 2O 2 △(1)、物理性质:淡黄色固体实验 3—5 实验步骤把水滴入盛有少量过氧化钠固体的试管中,立即把带火星的木条放在试管口,用手轻轻摸一摸试管外壁,然后向反应后的溶液中滴入酚酞试液. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 实验现象①带火星的木条复燃②试管壁温度升高③滴入酚酞后溶液变红实验结论① Na 2O 2与水反应产生 O 2②放出热量③同时有碱性物质生成 Na 2O 2H 2O Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. ?(2)、化学性质: ?和水反应: 2Na 2O 2 +2H 2 O=4NaOH+O 2↑ Na 2O 2既是氧化剂又是还原剂离子方程式: 2Na 2O 2 +2H 2 O=4Na + + 4OH - +O 2↑和 CO 2的反应: 2Na 2O 2 +2CO 2 =Na 2 CO 3 +O 2和酸反应:不是碱性氧化物 2Na 2O 2 +4HCl=4NaCl+O 2↑+ 2H 2O 实质:先和水反应, NaOH 再和酸反应 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. ?和盐溶