The wave patterns seen in Figures 19.4 and 19.5 are

CHAPTER ONE: ATOMS MATTER  Matter – anything that takes up space and has mass  Composed of particles  Structure determines the properties  Atoms are the building blocks of matter  2+ atoms = molecule  Early ideas of matter - Leucippus and Democritus – first to propose the definition of matter - John Dalton – evidence supported Leucippus and Democritus States of Matter  Solid - Atoms/molecules pack closely together - Vibrate but don’t move past each other - Fixed volume/shape  Liquid - Atoms/molecules pack close but able to move past each other - Fixed volume but no fixed shape - Assume shape of container  Gas - A lot of space between atoms/molecules - No fixed volume/shape - Free movement - ill all available space - Compressible Elements, Compounds, and Mixtures  Matter is classified based on its composition  Pure substance - One component/composition does not vary from one sample to another - Composed of individual atoms or a group of atoms - Elements or compounds - Can be broken down/decomposed  Mixtures - Compounds of 2+ particles that varies from one sample to another - Heterogeneous o Composition varies o Contains multiple substances that can be seen - Homogenous o Same composition throughout Scientific Approach to Knowledge  Based on obser