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教学目标科学概念:1.气体受热以后体积会膨胀,受冷以后体积会缩小。2.热膨胀现象与物体内部微粒的运动有关。过程与方法:1.用多种方法观察空气的热胀冷缩现象。2.尝试用游戏“模型”解释现象。情感态度与价值观:对热现象产生更浓的探究兴趣。教学重点1.气体受热以后体积会膨胀,受冷以后体积会缩小。2.热膨胀现象与物体内部微粒的运动有关。教学难点探索设计实验和互动交流,并尝试用“模型”解释现象。教学准备一个瘪了的乒乓球、热水、水槽。烧杯、气球、锥颈瓶、热水、冰水、平底烧瓶、胶塞、曲形玻璃管、高锰酸钾溶液、滴管、烧杯、肥皂水、注射器等。
Teaching objectives Scientific concept: 1. The volume of gas after the expansion of the body will be heated, the volume will be reduced after cold. 2. Thermal expansion phenomenon and the movement of particles inside the body. Process and methods: 1. With a variety of ways to observe the phenomenon of thermal expansion and contraction of air. Try the game “model ” to explain the phenomenon. Emotional attitudes and values: A more intense interest in exploring the phenomenon of heat. Teaching Focus 1. The volume of gas will be heated after the expansion, the volume will be reduced by the cold. 2. Thermal expansion phenomenon and the movement of particles inside the body. Teaching Difficulties Explore design experiments and interactions, and try to explain the phenomenon with “Model ”. Teaching prepare a flat table tennis, hot water, sink. Beakers, balloons, conical flask, hot water, ice water, flat-bottomed flask, rubber stopper, curved glass tube, potassium permanganate solution, pipette, beaker, soapy water, syringe and so on.