1. Demonstrate knowledge of bonding through a quiz. Identify the parts of a chemical equation. What is the difference between a physical and a chemical change? 02/25/2015

2. REMINDERS Chemical Equation Practice – Page 284 #1-3

3. Engineering Week Monday: Electronic Breakdown Tuesday: Egg Drop Challenge Wednesday: Build a Lightbulb (Resume Workshop) Thursday: Fling Machine Friday: Light Soldering

4. Physical Change Changes to a substance that do not result in new types of molecules. The chemical formula remains the same.

5. Changes in a substance that involve atoms rearranging to form new molecules. There is a change in the chemical formulas! Chemical Change Reaction

6. How can you tell if a chemical reaction is occurring? Gas formation

7. How can you tell if a chemical reaction is occurring? Precipitate (solid)

8. How can you tell if a chemical reaction is occurring? Color Change

9. Chemical Equations A model to represent what is happening during a chemical reaction.

10. Chemical Equations 2 NaCl (s)2 NaF (s) + F 2 (g)  + Cl 2 (g)

11. Symbols in Chemical Equations SYMBOLPURPOSE + Separates more than one reactant or product  Separates reactants from products. Indicates direction of reaction (s) Identifies a solid state

12. Symbols in Chemical Equations SYMBOLPURPOSE (aq) Identifies that something is dissolved in water (l)Identifies liquid state (g)Identifies gaseous state

13. Write the word equation for the following chemical equation. 2 NaCl (s)2 NaF (s) + F 2 (g)  + Cl 2 (g) 2 molecules of solid sodium chloride react with 1 molecule of fluorine gas to yield 2 molecules of solid sodium fluoride and 1 molecule of chlorine gas