CHEM101 Lecture Notes - Lecture 1: Celsius, International System Of Units, Boiling Point

• School: University of Delaware
• Department: Chemistry and Biochemistry
• Course: CHEM101
• Professor: William Bushey

Document Summary

Matter: anything that has mass and occupies space o chemistry is the study of matter: states of matter can be solids, liquids or gases (the three physical states, substance: form of matter that has a definite (constant composition and distinct properties) o can be either elements or compounds o can exist as a solid, a liquid, and a gas, the three physical states o examples: salt (sodium chloride), iron, water, mercury, carbon dioxide and oxygen o elements. A compound cannot be separated into simpler substances by any physical process: mixture: combination of two or more substances in which the substances retain their distinct identities (solids, liquids, gases) o homogeneous: uniform down to the molecular level (equally proportioned) o heterogeneous. Ex. sand and pebbles: si units*** o length: meter o mass: kg o time: second o electric current: ampere o temperature: kelvin.