Pure substance matter that always has exactly the

Pure substance – matter that always has exactly the same, uniform composition. Made of only elements & compounds! Ex. Salt, sugar, water or aluminum.

Elements – a substance that cannot be broken down into any simpler substance Ex. Copper, aluminum, gold, oxygen, +100 more (anything found on the periodic table!)

Compounds – a substance made from two or more elements chemically combined �THE PROPERTIES OF A COMPOUND DIFFER THE PROPERTIES OF THE ELEMENTS IT IS MADE OF. �Ex. Water is a compound made of hydrogen and oxygen + =

Mixture – a combination of two or more substances that are NOT chemically combined.

Two types of Mixtures Heterogeneous mixtures – the parts of the mixture are noticeably different Ex. Sand, mixed nuts, gold medal ribbon ice cream Homogenous mixtures – the parts of the mixture are evenly distributed and may appear to contain only one substance Ex. Stainless steel (a mixture of iron chromium and nickel) vanilla ice cream

�Solutions – a homogeneous mixture in which particles of a substance separate and spread out evenly throughout a mixture. �Solute – Ex. Salt substance that is dissolved in a solution �Solvent – substance that the solute is dissolved in Ex. Water

Suspensions – heterogeneous mixtures that separates into layers over time; particles that do not dissolve like in a solution Ex. Sand mixed with water

� Concentration – measures the amount of solute dissolved in the amount of solvent. �Measured in g/m. L � Solubility – the amount of solute that can dissolve in a solvent at a certain temperature �temperature affects solubility