1. Particle Definitions Unit 4

2. ATOM A single particle that represents an element EXAMPLE:

3. Molecule Two or more atoms chemically combined/bonded Two or more IDENTICAL or DIFFERENT symbols touching May contain identical or different elements represented by different symbols

4. Molecule

5. Turn and Talk ETMLIF … Explain to Me Like I’m Five … Looking at different pictures, how can I determine which are atoms and which are molecules?

6. Element Anything on the periodic table It is an atom if there is a single particle It is a molecule if there are more than ONE IDENTICAL atoms of an element bonded together EXAMPLES: Gold, Carbon, Helium

7. Atoms of an Element

8. Molecules of an Element

9. Compound Two or more atoms of DIFFERENT elements chemically bonded Two or more different symbols touching ALWAYS REPRESENTED BY A MOLECULE EXAMPLES: Water, Carbon dioxide

10. Compound

11. QUIZZICAL QUESTION Which statement below is TRUE? A. All MOLECULES represent a COMPOUND. B. All COMPOUNDS must be represented by a MOLECULE.

12. Practice! 1.Identify if the picture represents an ATOM or a MOLECULE. 2.Identify if the picture represents an ELEMENT or a COMPOUND.

16. QUIZZICAL QUESTION A particle diagram shows two circles that are touching each other. How would you determine if this represents a molecule of an element or a molecule of a compound?

17. Mixture Any combination of two or more elements and/or compounds CAN BE: Heterogeneous: NOT uniform composition, varied composition Homogeneous: uniform composition

18. Heterogeneous Mixture Examples: Italian salad dressing, ice cubes in soda, pizza

19. Homogeneous Mixture Examples: Creamer in coffee, laundry detergent, blood