Presentation on theme: "1.1 The Puzzle of Matter Objectives"— Presentation transcript:
1 1.1 The Puzzle of Matter Objectives Classify matter according to its composition.Distinguish between elements, compounds, homogeneous mixtures, and heterogeneous mixtures.Relate the properties of matter to structure.
2 ChemistryTextbook Definition the science that investigates and explains the structure and properties of matter.Macroscopic level of matter—based on behavior and observed composition of matterSubmicroscopic level of matter—used to determine how the hidden structure of matter influences its behavior
6 Matter can be classified as a… A Pure Substancematter with the same fixed composition and properties.Pure means that every bit of the matter being examined is the same substance.Examples:Mixtureis a combination of two or more substances in which the basic identity of each substance is not changed.Can be separated by physical processes (aka physical changes)Examples:
8 Mixtures can be classified as.. Heterogeneous: does not have a uniform composition and its individual substances remain distinct.Homogeneous: always has a uniform composition and is the same throughout.Can be liquid or solidAlloys: solid solution that contains different metals and sometimes nonmetallic substances.AKA: solutions
13 Pure Substances can be classified as…. ElementsAn element is the simplest form of matterThere are 117 elements—only 90 occur naturally on Earth.The periodic table organizes elements and uses chemical symbols that are universally understood.Represented by: Chemical SymbolCompoundsA compound is a chemical combination of two or more different elements joined together in a fixed proportionRepresented by chemical formula-show what elements make up a compound and the number of atoms of each element.Molecule- smallest unit of a compound