CHEM-UA 120 Lecture : Lecture 1 Notes

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When force is remaining constant, if you decrease the area of the object in which the pressure is being exerted you in turn increase the pressure. Matter: anything that occupies space and has mass. Mass: the amount of matter in a substance. Substance (pure substance): can be an element or a compound. Element: one of the 108 basic building blocks of all matter; elements cannot be broken down into smaller units by simple chemical means. (ex: na, h, o) **108 is about the number of. Natural elements; there are more elements and the number changes frequently but these newer, artificially made elements typically don"t last more than a few seconds. Compound: a form of matter in which two or more elements are held together in a fixed ratio by chemical bonds. Atmospheric pressure: pressure exerted on the earth"s surface due to the gases of the air colliding with the earth.