Chapter 1 Introduction: Matter and Measurement

Section 1.1 The Study of Chemistry

Chemistry The study of matter and the changes it undergoes Matter Physical material of the world Has mass Takes up space

Matter  116 Elements  Atoms (submicroscopic)

Atom + Atom = Molecule

Property Any characteristic that allows us to recognize and distinguish Can be physical or chemical

Physical Property Chart

Chemical Property Chart

Always Remember… We study chemistry at the submicroscopic level in order to explain macroscopic events

Section 1.2 Classifications of Matter

States of Matter 3 Forms Solid Liquid Gas

Three States of Matter

Pure Substance Element Compound An element cannot be decomposed into simpler substances A compound is a relatively stable combination of two or more chemically bonded elements in a specific ratio. Can be decomposed

Mixtures Mixtures consist of two or more substances Homogenous mixtures are uniform throughout. –Air, sea water, and a nickel coin Heterogeneous mixtures vary in texture and appearance throughout the sample. –Rocks, wood, polluted air, and muddy water

Pure Substances Fixed elemental composition Mixtures Varying composition