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Chapter 1 Notes Chemistry – The study of the composition, structure, and properties of matter and the changes it undergoes. Matter Pure Substances Elements Mixtures Compounds Atoms Protons Neutrons Homogeneous Molecule Heterogeneous Colloid Suspension Electrons Matter – anything with mass and volume Pure Substance – cannot be broken down by physical means Element – contains only one kind of atom Atom – smallest unit of an atom, made of protons, neutrons, and electrons Compound – chemically bonded atoms Molecule – smallest unit of a compound Mixture – more than one pure substance Homogeneous – mixed at the atomic level Solution solute + solvent Separated by distillation Does not settle Cannot be filtered Colloid cloudy Does not settle Cannot be filtered Exhibits Tyndall effect Suspension – can be filtered Settles
