2022年2018鲁教版化学八年级2.1《运动的水分子》word导学案 .pdf
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2022年2018鲁教版化学八年级2.1《运动的水分子》word导学案 .pdf
名师精编优秀教案2.1 运动的水分子第一课时学习目标：1、会分析水分子的运动与水的三态变化之间的关系。2、认识分子的基本特征。3、了解水天然循环的过程，学会用分子运动的观点解释水的天然循环现象。学习重点：分子的性质【课前预习题】一、水的天然循环1、水的天然循环是通过水的_ 变化完成的，在此过程中，_ 为水提供了能量。通过水的天然循环，实现了水的 _ ，完成了水资源的二、水的三态变化1、水的三态变化的原因水是由大量的 _ 构成的，每个水分子都是由2 个氢原子和1 个氧原子构成的。用 H2O 表示水。水受热时，水分子能量，分子的运动速率 _，分子间的间隔 _，水由液态变成气态；水蒸气遇冷，水分子能量，分子的运动速率_，分子间的间隔_，水又由气态变成液态。2、分子分子是构成物质的一种粒子，许多物质都是由分子构成的。分子的特征主要有三点：（1）_ _（2）_ _(3)_ _ 三、填空题1.水是由 _ _ _ 构成的，一滴水含有_ 个水分子。名师精编优秀教案2.水由冰变为液体，再由液态变成水蒸气属于_ 变化；水分子的_ _ 和_ _ 不会变化，变化的只是水分子之间的_ 和_，水的三态变化属于_ _ 变化。3.固体的水，水分子 _，分子都在 _ 震动；液态的水，水分子 _，在一定体积内_ _；气态的水，水分子_ _，在 _ 或_。4.通过预习你能解释一下雪是怎么形成的吗？_。【探究一】1、把封闭的针管中的少量水煮沸，液态变为水蒸气，体积会明显的增大，在这个过程中水分子发生了怎么的变化？2、再将上述针管插入冰块，会有怎样的现象？【知识点】一定量的水，当它由固态变为液态，再由液态变为固态时，变化的是_ _，不变的是 _。阅读课本有关不同态的水中水分子的排列内容。思考不同状态下水分子的排列特点，并制作成图表形式。【探究二】文档编码:CG9O8L2U4S6 HH3I3S7J3E7 ZC4Z7Y6N4A1文档编码:CG9O8L2U4S6 HH3I3S7J3E7 ZC4Z7Y6N4A1文档编码:CG9O8L2U4S6 HH3I3S7J3E7 ZC4Z7Y6N4A1文档编码:CG9O8L2U4S6 HH3I3S7J3E7 ZC4Z7Y6N4A1文档编码:CG9O8L2U4S6 HH3I3S7J3E7 ZC4Z7Y6N4A1文档编码:CG9O8L2U4S6 HH3I3S7J3E7 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