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class="excellent_articles_title">相關(guān)推薦</li> </ul></div> <p>教案我們周?chē)目諝?/p><p>　　<strong>教學(xué)目標：</strong></p><p style="text-align: center;"><img loading="lazy" src="https://p.9136.com/00/l/bdccb0b82_2.jpg" alt="教案我們周?chē)目諝?/></p><p>　　1：認識空氣的主要組成。</p><p>　　2：了解空氣的主要成分及體積分數�？諝馐且环N寶貴的自然資源，要防止空氣污染。</p><p>　　3：認識什么是混合物、純凈物。</p><p>　　4：了解什么是物理性質(zhì)。</p><p>　　重點(diǎn)：空氣的成份、物理性質(zhì)</p><p>　　難點(diǎn)：空氣組成的實(shí)驗原理，混合物、純凈物的區別</p><p>　　<strong>教學(xué)過(guò)程：</strong></p><p>　　一：空氣是由什么組成的</p><p>　　思考：空氣是一種單一的物質(zhì)嗎？</p><p>　　空氣是一種既看不到蹤影又聞不到氣味的氣體，所以科學(xué)家們經(jīng)過(guò)了漫長(cháng)歲月的研究，終于揭開(kāi)了組成“空氣王國成員”的'奧秘，認識到空氣并不是一種單一的物質(zhì)，化學(xué)教案《第二單元我們周?chē)目諝猓ń贪福n題1空氣》。</p><p>　　18世紀70年代.瑞典化學(xué)家舍勒和英國科學(xué)家普里斯特里,首先發(fā)現并制得氧氣.</p><p>　　法國化學(xué)家拉瓦錫,在前人工作的基礎上,首先通過(guò)實(shí)驗得出了空氣是由氧氣和氮氣組成的.</p><p>　　【設問(wèn)】空氣是一種看不到又聞不到的物質(zhì)，我們怎樣能證明空氣確實(shí)的存在呢？</p><p>　　【討論】讓學(xué)生討論得出能證明空氣確實(shí)存在的方法。</p><p>　　【演示】將一只空集氣瓶倒扣在水盆中，但水不能進(jìn)滿(mǎn)集氣瓶。</p><p>　　【講述】這是證明空氣確實(shí)存在的最簡(jiǎn)單方法。</p><p>　　【引入】空氣確實(shí)存在，但空氣的組成是比較復雜的。</p><p>　　【演示】實(shí)驗2-1演示“測定空氣里氧氣含量”的實(shí)驗。在實(shí)驗中不斷向學(xué)生提問(wèn)，設置懸念讓學(xué)生思考或提出假設。</p><p>　　例如：</p><p>　�。�1）將紅磷點(diǎn)燃后放到集氣瓶里，見(jiàn)到什么現象？為什么會(huì )有這種現象？（特別注意煙、霧的區別）（紅磷燃燒時(shí)火焰呈明亮的黃白色，有濃厚的白煙，因為生成固體小顆粒）。</p><p>　　用文字表示磷在氧氣中燃燒的式子：磷 + 氧氣五氧化二磷4P + 5O2 點(diǎn)燃 2P2O5</p><p>　�。�2）猜想把止水夾打開(kāi)后會(huì )有什么現象？為什么？（打開(kāi)彈簧夾后，燒杯中的水會(huì )進(jìn)入集氣瓶，約占集氣瓶容積的1/5。提示：誤差產(chǎn)生的主要原因：蠟燭燃燒后生成物的狀態(tài)、溶解性：氣態(tài)不溶于水就會(huì )占據一定的空間）。</p><p>　�。�3）為什么紅磷燃燒時(shí)只消耗了集氣瓶?jì)葰怏w的1/5而不是全部呢？若剩余氣體是氮氣，且氮氣是“不能維持生命”的氣體，同學(xué)們可以用什么假設來(lái)說(shuō)明呢（可以在剩余氣體中放一只飛蟲(chóng)，飛蟲(chóng)不久會(huì )死亡）？</p> <script>s("content_relate");</script><p>【教案我們周?chē)目諝狻肯嚓P(guān)文章：</p><p><a target="_blank" href="http://m.hafencaoymj.com/jiaoan/2347181.html" title="我們周?chē)目諝饨贪?>我們周?chē)目諝饨贪?/a><span>02-15</span></p><p><a target="_blank" href="http://m.hafencaoymj.com/kejian/1543882.html" title="我們周?chē)目諝饨贪刚n件">我們周?chē)目諝饨贪刚n件</a><span>05-12</span></p><p><a target="_blank" href="http://m.hafencaoymj.com/shuokegao/1277308.html" title="我們周?chē)目諝庹f(shuō)課稿">我們周?chē)目諝庹f(shuō)課稿</a><span>02-23</span></p><p><a target="_blank" 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