初一上科学第四单元复习课件（Science fourth unit review courseware on the first day of the year）.doc

初一上科学第四单元复习课件（Science fourth unit review courseware on the first day of the year） In this paper, the contribution of ER retention by groups tips Ppt documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. The fourth chapter is about the characteristics of matter Composition and characteristics of matter A composition of matter; solubility; acidity or alkalinity; physical properties; chemical properties discuss Temperature T (temperature) In 1, Hyperion, and rosin melting image what is common and different? What are the similarities and differences? The characteristics of the melting of rosin: the melting characteristics of rosin: there is no definite melting temperature, no definite melting temperature, and it absorbs heat and absorbs heat in the process of melting, and gradually rises in the process of heat absorption. The temperature is going up and the temperature is going up. The image time of rosin melting time is t (time division) 2. Both crystals and amorphous crystals absorb heat from the outside when melting. Crystals and amorphous crystals absorb heat from the outside when they melt. When melting, the heat is absorbed from the outside 3, and the temperature at which the crystal melts is called the melting point. The temperature at which the crystal melts is called the melting point. Melting point 4, different crystal melting point is different; melting point is a kind of crystal, different crystal melting