Chapter 2-1

1. Chapter 2-1 What is Matter?

2. Chemistry • Chemistry – what things are made of • What their properties are • How they interact and change • Used everyday in life

3. Matter • Matter - anything that has mass and occupies space • Air is matter! • Light, energy and sound aren’t

4. Elements • Everything is built from atoms. • Element – substance that cannot be broken down by chemical means

6. 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

8. Molecules • Molecules – smallest unit of a substance that behaves like the substance • More than one atom together • Same or different atoms

9. 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

10. 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

11. Mixtures • Mixture – combination of 2 or more substances that are not chemically combined • Example - Pizza

13. Heterogeneous Mixture • Heterogeneous mixture – substances aren’t mixed uniformly and aren’t distributed evenly

14. Heterogeneous Mixtures

15. Homogeneous Mixtures • Homogeneous mixture- contains two or more gaseous, liquid, or solid substances blended evenly throughout.

18. Miscible vs Immiscible • Miscible – homogenous mixture of liquids or gas • Immiscible – heterogeneous mixture of liquids • Oil and water

19. Gas mixed with Liquids • Carbonated drinks • Noncarbonated drinks • Lemon meringue pie