1. Atoms The basic component of all matter. The atom is the smallest particle of an element that has all of the chemical properties of that element. Atoms consist of a nucleus of protons and neutrons surrounded by electrons. http://www.ktf-split.hr/glossary/image/atom.gif

2. Elements A substance consisting of a single type of atom. It cannot be broken down into different kinds of matter. http://www.rentrain.com/reso urces/Helium%20Safety.jpg http://www.reachoutmichigan.org/fune xperiments/agesubject/lessons/handout s/helium.GIF

3. Combinations of Elements: Mixtures A substance consisting of two or more substances mixed together. Mixtures can usually be separated by mechanical means. Two or more substances mixed together in such a way that each remains unchanged. http://www.seelecttea.com/

4. Combinations of Elements: Compounds A substance formed from two or more elements, with a fixed ratio determining the composition. The elements lose their individual chemical properties and the compound has new properties. http://www.awwu.biz

5. Molecules Compound of two or more atoms, the smallest unit of chemical compounds. The smallest particle of a substance that has all of the physical and chemical properties of that substance. http://www.awwu.biz

6. Formulas The formula which identifies the atoms and the number of each kind in the molecules of a compound. The number and types of atoms in a molecule. Glucose - C 6 H 12 O 6

7. Formulas 6C 6 H 12 O 6 Elements in the compound: Carbon Hydrogen Oxygen

8. Formulas: Subscripts 6C 6 H 12 O 6 # of atoms of each element in a molecule of the compound: Carbon - 6 Hydrogen - 12 Oxygen - 6

9. Formulas: Coefficients 6C 6 H 12 O 6 # of molecules: 6 molecules of glucose