1. Grab binders, handouts & returned work & begin the Do Now 4/30 Do Now 1.Silently read the article titled “Biodegradable Definition”, and answer the following 3 questions as you read… -Define biodegradable in your own words -What are pitfalls of biodegradable products? -What are some examples of a biodegradable products you use in your daily lives?

2. Mandatory Office Hours P1 David Nicholas Marcus Michael Ruben Dajon Antwan P3 Justin William Delante Bradley Monica Monique Devonte G4 Doenika Tayia Neddji Roberto Diamond Perla David La’Nesha Arturo Milton Terrae G5 Adalynn Arkita Angel F Joey Alyssia Raven Lizabel Cesar

3. Reaction Equation Recap: Phases 2H 2 O 2 (aq)  2H 2 O(l) + O 2 (g) ReactantsProducts -1 reactant, 2 products -Chemical rxn NOT physical rxn

4. What types of chemical reactions are there?

5. Decomposition Description: a compound breaks down to simpler products General Equation: AB  A + B Example: 2NaCl  2Na + Cl 2 Question: More products than reactants?

6. Synthesis Description: 2 or more simpler reactants join to form a compound General Equation: A + B  AB Example: 2Na + Cl 2  2NaCl Question: More reactants than products?

7. Single Exchange Description: a single atom replaces another atom in a compound General Equation: A + BC  AC + B Example: 2Na + CuCl  2NaCl + Cu Question: Do we see a single element on both sides?

8. Double Exchange Description: atoms in compounds switch partners and end with 2 new compounds General Equation: AB + CD  AD + BC Example: NaCl + LiBr  NaBr + LiCl Question: 2 compounds of reactants and as products?

9. Combustion Description: a CH compound burns in O 2 to form CO 2 and H 2 O (water) Example: C 2 H 4 + 3O 2  2CO 2 + 2H 2 O Question: are CO 2 and H 2 O products?

10. Law of Conservation of Mass Key Point 1: - In a chemical reaction, the mass of the products equals the mass of the reactants

11. Lab 2: Biodegradable Soap Question: Are natural, homemade soaps better or worse for our skin compared to generically mass-produced soaps? Directions: 20 min… - determine the WHAT part of your purpose - Read the lab background and complete the hypothesis and Pre-lab questions

12. Lab 2: Biodegradable Soap Directions: 40 min… - Complete the Lab - Clean up your lab bench - Begin your written lab report & complete class work

13. Counting Atoms in Compounds Step 1: Identify each element in the compound Step 2: Distribute your subscripts Step 3: Distribute your coefficients across all elements a. 4PO 4 b. 6C 3 H 8 O 2 c. (CH 4 ) 2 N 2

14. Counting Atoms Guided Practice How many atoms of each element are in the following molecules? How many atoms of each element are in the following molecules? 1. H 2 SO 4 2. CaOH 2 3. NaCl 4. (NH 3 ) 3 PO 4 5. 3H 2 O

15. Answers 1. 2 hydrogen, 1 sulfur, 4 oxygen 1. 2 hydrogen, 1 sulfur, 4 oxygen 2. 1 calcium, 1 oxygen, 2 hydrogen 2. 1 calcium, 1 oxygen, 2 hydrogen 3. 1 sodium, 1 chlorine 3. 1 sodium, 1 chlorine 4. 3 nitrogen, 9 hydrogen, 1 phosphorus, 4 oxygen 4. 3 nitrogen, 9 hydrogen, 1 phosphorus, 4 oxygen 5. 6 hydrogen, 3 oxygen 5. 6 hydrogen, 3 oxygen

16. Exit Ticket 3 Directions: You have 5 minutes to complete the Exit Ticket to the best of your ability. You MAY NOT use notes, but you may use a Periodic Table. When finished submit to the class bucket and put up your binder.