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教学目标1.认识是化学变化及其基本特征,认识化合、氧化反应,能识别氧化物。2.认识化学反应中的能量变化及一些化学反应现象。教学过程(一)联系实际、导入新课(二)层层深入、讲述新课因为氧气与人类的生活联系的非常紧密,我们就有必要来研究一下氧气具有怎样的性质。首先研究氧气的物理性质物理性质1.常状况下,氧气是无色、无味的气体2.密度比空气略大3.不易溶解于水4.氧气–183c液态氧-218c固态氧
Teaching Objectives 1. Awareness is a chemical change and its basic characteristics, understanding chemical compounds, oxidation reactions, to identify oxides. 2. Recognize the energy changes in chemical reactions and some chemical reactions. Teaching process (a) contact with the actual, into the new lesson (b) layers of depth, about the new lesson Because of oxygen and human life is very close, we need to study what kind of oxygen has the nature. First of all, the physical properties of oxygen physical properties 1. Often, oxygen is colorless, odorless gas 2. Density slightly larger than the air 3. Difficult to dissolve in water 4. Oxygen -183c liquid oxygen-218c solid oxygen