Catalyst - Something that speeds up reactions by lowering the activation level, Element - A material with only one type of atom, Compound - 2 or more elements chemically bonded together, Mixture - 2 or more elements mixed, Group - Columns in the periodic table, Period - Rows in the periodic table, The person who created the PTable - Dmitri Mendeleev, How the periodic table is arranged - Atomic Mass, CO2 test - Limewater test, Hydrogen test - Squeaky pop test, O2 Test - Glowing splint test,




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