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自中考出现理化综合试题以来,在总分为120分的河北省初中升学统一考试理科综合试卷中,理化综合试题占了30分。理化综合试题的知识点主要包括物理中的密度、压强和化学变化的结合,而在压强与化学变化的结合题中,基本上都是因为气体的体积变化造成的。下面就初中化学中的两类典型
Since the physics and chemistry comprehensive examination questions emerged in the examination, the physical and chemical comprehensive examination questions accounted for 30 points in the comprehensive science examination paper for the unified examination for junior high school students in Hebei Province, which is divided into 120 points. The knowledge points of the physics and chemistry comprehensive examination questions mainly include the combination of density, pressure and chemical change in the physics, and in the combination of pressure and chemical change, basically, it is caused by the volume change of the gas. Here are two typical types of chemistry in junior high school