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Unit 3 Study Guide Test Date: _______________________ Smallest part of an element that can still be classified as that element: o Atom Mass does not change. Weight changes depending on your location (gravity). Do you remember how to read a tile on the Periodic Table? Which number represents the atomic number? Atomic mass? Examples of a physical property: o Density o Solubility (dissolving) o Malleability o Ductility Examples of a chemical change: o Rusting o Producing a new gas o Burning o Cooking/baking o Tarnishing o Photosynthesis (plant growth) o Reactive Elements – made up of ONE type of atom o Examples: Na (Sodium), C (Carbon), H (Hydrogen), Al (Aluminum) Compounds/Molecules – two or more atoms CHEMICALLY combined o Examples: NaCl (table salt), CO2 (carbon dioxide), H2O (water), H2O2 (hydrogen peroxide) Mixtures – two or more substances PHYSICALLY combined o Examples: soil, salt and sand, sugar dissolved in water o Heterogeneous – a mixture that is NOT the same throughout o Homogeneous – a mixture that IS the same throughout Solid – particles are close together and vibrate slightly Liquid – particles are close together but are able to slide past one another Gas – particles are far apart and move around freely Plasma – behaves like a gas; charged particles move around freely o Examples: lightning, stars, Northern Lights There are currently 118 known elements on the Periodic Table.