We can observe some physical properties, such as density and color, without changing the physical state of the matter observed. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. A physical property is a characteristic of matter that is not associated with a change in its chemical composition. The characteristics that enable us to distinguish one substance from another are called properties. The faster they move, the “hotter” it is. If heat is needs to be supplied, the change is endothermic.Īn important distinction, is that heat is energy that flows due to a temperature difference, while temperature is a measure of the average kinetic energy of the molecules in a substance. When matter undergoes change, the process is often accompanied by a change in energy - heat, light, sound, kinetic energy of moving matter, etc… If heat is evolved during a change (is released) the change is exothermic. In this chapter, we’ll take a closer look at matter and energy and how they are related. Recall that chemistry is the study of matter, its properties, the changes that matter undergoes and the energy associated with these changes. Identify properties of matter as extensive or intensive. Identify properties of and changes in matter as physical or chemical.By the end of this section, you will be able to:
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |