Grab binders, handouts & returned work & begin the Do Now

4/30 Do Now1. 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?

Mandatory Office HoursP1

DavidNicholasMarcusMichaelRubenDajonAntwan

P3JustinWilliamDelanteBradleyMonicaMoniqueDevonte

G4DoenikaTayiaNeddjiRobertoDiamondPerlaDavidLa’NeshaArturoMiltonTerrae

G5AdalynnArkitaAngel FJoeyAlyssiaRavenLizabelCesar

Reaction Equation Recap:

Phases

2H2O2(aq) 2H2O(l) + O2(g)

Reactants Products- 1 reactant, 2 products- Chemical rxn NOT physical rxn

What types of chemical reactions are there?

Decomposition • Description: a compound breaks down to

simpler products• General Equation:

AB A + B• Example:

2NaCl 2Na + Cl2

• Question: More products than reactants?

Synthesis• Description: 2 or more simpler reactants

join to form a compound• General Equation:

A + B AB• Example:

2Na + Cl2 2NaCl

Question: More reactants than products?

Single Exchange• Description: a single atom replaces

another atom in a compound • General Equation:

A + BC AC + B• Example:

2Na + CuCl 2NaCl + CuQuestion: Do we see a single element on both sides?

Double Exchange• Description: atoms in compounds switch

partners and end with 2 new compounds• General Equation:

AB + CD AD + BC• Example:

NaCl + LiBr NaBr + LiClQuestion: 2 compounds of reactants and as products?

Combustion• Description: a CH compound burns in O2

to form CO2 and H2O (water)

• Example:C2H4 + 3O2 2CO2 + 2H2O

Question: are CO2 and H2O products?

Law of Conservation of MassKey Point 1:

- In a chemical reaction, the mass of the products equals the mass of the reactants

Lab 2: Biodegradable SoapQuestion:

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

Lab 2: Biodegradable SoapDirections: 40 min…

- Complete the Lab- Clean up your lab bench- Begin your written lab report & complete class work

Counting Atoms in CompoundsStep 1:

Identify each element in the compoundStep 2:

Distribute your subscriptsStep 3:

Distribute your coefficients across all elements

a. 4PO4

b. 6C3H8O2

c. (CH4) 2N2

Counting Atoms Guided Practice How many atoms of each element are in the

following molecules?

1. H2SO4

2. CaOH2

3. NaCl

4. (NH3)3PO4

5. 3H2O

Answers 1. 2 hydrogen, 1 sulfur, 4 oxygen 2. 1 calcium, 1 oxygen, 2 hydrogen 3. 1 sodium, 1 chlorine 4. 3 nitrogen, 9 hydrogen, 1

phosphorus, 4 oxygen 5. 6 hydrogen, 3 oxygen

Exit Ticket 3Directions:

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.