2. New Substances produced by changing the way atoms are arranged Physical Changes ≠ Chemical Reaction Evidence Change in Color (rust) Temperature Change (endo/exo-thermic) Formation of a Gas Formation of a Solid (Precipitate)

3. Reactants: Substances Present @ Beginning Products: Substances Formed by the Reaction Yields: An “equal sign” in a chemical reaction meaning “produces”, “creates”, or “forms”… Na + Cl 2  NaCl Reactants Yields Products

5. …Combining Elements… A + B  AB Mg + O 2  MgO

6. …Separating Elements… CD  C + D H 2 O  H 2 + O 2 (+Electricity)

7. …FIRE! (Needs Oxygen and produces CO 2 )… EF + O 2  H 2 O + CO 2 CH 4 + O 2  H 2 O + CO 2

8. …Switch out ONE element with another!... GH + I  GI + H CuCl 2 + Zn  ZnCl 2 + Cu

9. …Switch Out Two Elements with Two Others!... JK + LM  JM + KL AgNO 3 + HCl  AgCl + HNO 3 (Stop Here)

10. Concentration High Concentration = faster reaction Surface Area More surfaces available to react = faster reaction Temperature Higher Temperatures = faster reaction Particles speed up or slow down…speeding up or slowing down the reaction…

11. Catalyst Something that speeds up the rate of reaction without being affected itself. Inhibitor Something that slows down the rate of reaction without being affected itself. (Stop Here)

12. Matter Can Neither Be Created Nor Destroyed Reactants and Products MUST be EQUAL! So… We Balance Chemical Equations!

13. Adding Coefficients to Reactants and Products in order to make both sides of the arrow EQUAL! Na + Cl 2  NaCl Reactants Yields Products This Chemical Equation is WRONG! (Why??)Na: 1 Cl: 2 Cl: 1 The Numbers of Atoms are not BALANCED!

14. So….We add Coefficients to Make the Equation Balanced! We can NEVER EVER Add or Take Away Subscripts! EVER!! Na + Cl 2  NaClNa: 1 Cl: 2Cl: 1 It is BALANCED!! WOO HOO!

15. So…My Balanced, Correct Chemical Reaction Between Sodium and Chlorine is… 2Na + Cl 2  2NaCl This says that TWO atoms of sodium react with ONE diatomic molecule of chlorine and produces TWO molecules of sodium chloride!

16. H 2 + O 2  H 2 OH:O: Start By Setting it Up Like This

17. H 2 + O 2  H 2 OH: 2 O: 2O: 1 ¿¿¿ ¿¿¿Questions ??? ???

18. Try to balance the following reactions! You may check with a partner as you work! 1. Mg + O 2  MgO 2. N 2 + H 2  NH 3 3. Cl 2 + KI  KCl + I 2 4. Na + HCl  H 2 + NaCl

19. 1. 2Mg + O 2  2MgO 2. N 2 + 3H 2  2NH 3 3. Cl 2 + 2KI  2KCl + I 2 4. 2Na + 2HCl  H 2 + 2NaCl

20. Copy and complete the following flow map using your notes. Be sure to COLOR CODE to match your notes! Add extra reminder “bubbles” as you go! How to Balance Chemical Equations 1) Count the number of ATOMS on each side of the chemical equation H 2 + O 2  H 2 O H: 2 H: 2 O: 2 O: 1 2. Add Coefficients on each side of the equation so that… 3. …Continue…

21. Classifications 1 (1:30) Classifications 1 Classifications 2 (1:30) Classifications 2 Alkali Metals in Water (3 min) Alkali Metals in Water Sodium in Water (1 min) Sodium in Water Dry Ice Eruptions (11 min) Dry Ice Eruptions Francium Bomb in Ocean (30 sec) Francium Bomb in Ocean Chemistry Explosions (13 min) Chemistry Explosions