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Chapter 2-1. What is Matter?. Chemistry. Chemistry – what things are made of What their properties are How they interact and change Used everyday in life. Matter. Matter - anything that has mass and occupies space Air is matter! Light, energy and sound aren’t. Elements.
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Chapter 2-1 What is Matter?
Chemistry • Chemistry – what things are made of • What their properties are • How they interact and change • Used everyday in life
Matter • Matter - anything that has mass and occupies space • Air is matter! • Light, energy and sound aren’t
Elements • Everything is built from atoms. • Element – substance that cannot be broken down by chemical means
Compounds • Compound – substance made of 2 or more different elements • Chemically combine • Example – Water or H2O • Elements hydrogen (2 atoms) and oxygen (1 atom) combine to form water
Molecules • Molecules – smallest unit of a substance that behaves like the substance • More than one atom together • Same or different atoms
Chemical Formula • Chemical formula– shows how many atoms of each element are in a substance • # in front of letter = # of molecules • # in subscript = # of atoms • 3C12H22O11 • 3 molecules of sugar • Each molecule contains given # of atoms
Pure Substances • Materials are made of a pure substance or a mixture of substances. • Pure substance - matter that has a fixed composition and definite properties • Elements or compounds
Mixtures • Mixture – combination of 2 or more substances that are not chemically combined • Example - Pizza
Heterogeneous Mixture • Heterogeneous mixture – substances aren’t mixed uniformly and aren’t distributed evenly
Homogeneous Mixtures • Homogeneous mixture- contains two or more gaseous, liquid, or solid substances blended evenly throughout.
Miscible vs Immiscible • Miscible – homogenous mixture of liquids or gas • Immiscible – heterogeneous mixture of liquids • Oil and water
Gas mixed with Liquids • Carbonated drinks • Noncarbonated drinks • Lemon meringue pie