1. Once you’re in, you’re in.
When the bell rings, voice at zero, working on the Do Now in Do Now Form (flip over the one you have from last week).
Pick up daily handouts. Pick up turned back docs.
Turn in your MARSHMALLOW ACTIVITY (A LOT ARE MISSING!) TURN IN ANY TEST CORRECTIONS TURN IN YOUR BUBBLE GUM LAB TURN IN TAKE HOME TEST
Do Now 10/14/2013
A compound was analyzed and found to contain 13.5 g Ca, g O, and g H.  What is the empirical formula of the compound?
Calculate the number of molecules found in 32 grams of CH4

2. Do Now Review 10/14/2013
A compound was analyzed and found to contain g Ca, 10.8 g O, and g H.  What is the empirical formula of the compound?
Calculate the number of molecules found in 32 grams of CH4

3. Tutoring and Makeup Work
Tuesday/Thursday 2:30-3:30
Wednesday at Lunch (let me know ahead of time this week)
TWO weeks left in the quarter – if your name is on the board , you owe me a quiz or a test!!
Zeros

4. Homework Chemical Reaction Worksheet #7-20 **
Any makeup work / late work
Extra Credit Half sheet (percent composition sheet)
**graded

5. Objectives
SWBAT
1. Determine empirical formula based on provided element percentages
2. Determine molecular formula when given empirical formula and sample size
3. Conclude reaction type based on provided formulas

6. Empirical Molecular Review

7. Write the Empirical Formula for the following problems
C6H6
C8H18
WO2
C2H6O2
X39Y13

8. 1. What’s the empirical formula of a molecule containing 65
1. What’s the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen?

9. 2. If the molar mass of the compound in problem 1 is 110 grams/mole, what’s the molecular formula?

10. 3. What’s the empirical formula of a molecule containing 18
3. What’s the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65.0% oxygen?

11. 4. If the molar mass of the compound in problem 3 is 73
4. If the molar mass of the compound in problem 3 is 73.8 grams/mole, what’s the molecular formula?

12. Reaction Types

13. Combination (Synthesis) Reactions
Two or more substances combine to form a new compound.
A + X  AX
Reaction of elements with oxygen and sulfur
Reactions of metals with Halogens
Synthesis Reactions with Oxides
There are others not covered here!

14. Decomposition Reactions
A single compound undergoes a reaction that produces two or more simpler substances
AX  A + X
Decomposition of:
Binary compounds H2O(l )  2H2(g) + O2(g)
Metal carbonates CaCO3(s)  CaO(s) + CO2(g)
Metal hydroxides Ca(OH)2(s)  CaO(s) + H2O(g)
Metal chlorates 2KClO3(s)  2KCl(s) + 3O2(g)
Oxyacids H2CO3(aq)  CO2(g) + H2O(l )

15. Single Replacement Reactions
A + BX  AX + B
BX + Y  BY + X
Replacement of:
Metals by another metal
Hydrogen in water by a metal
Hydrogen in an acid by a metal
Halogens by more active halogens

16. The Activity Series of the Metals
Lithium
Potassium
Calcium
Sodium
Magnesium
Aluminum
Zinc
Chromium
Iron
Nickel
Lead
Hydrogen
Bismuth
Copper
Mercury
Silver
Platinum
Gold
Metals can replace other metals provided that they are above the metal that they are trying to replace
Metals above hydrogen can replace hydrogen in acids.
Metals from sodium upward can replace hydrogen in water

17. The Activity Series of the Halogens
Halogens can replace other halogens in compounds, provided
that they are above the halogen that they are trying to replace.
Fluorine
Chlorine
Bromine
Iodine
2NaCl(s) + F2(g) 
???
2NaF(s) + Cl2(g)
MgCl2(s) + Br2(g) 
???
No Reaction

18. Double Replacement Reactions
The ions of two compounds exchange places in an aqueous solution to form two new compounds.
AX + BY  AY + BX
One of the compounds formed is usually a precipitate, an insoluble gas that bubbles out of solution, or a molecular compound, usually water.

19. Combustion Reactions
A substance combines with oxygen, releasing a large amount of energy in the form of light and heat.
Reactive elements combine with oxygen
P4(s) + 5O2(g)  P4O10(s)
(This is also a synthesis reaction)
The burning of natural gas, wood, gasoline
ENDED PD 1
C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(g)

20. Acid-Base Reactions
This is a special kind of double displacement reaction that takes place when an acid and base react with each other. The H+ ion in the acid reacts with the OH- ion in the base, causing the formation of water. Generally, the product of this reaction is some ionic salt and water:
HA + BOH ---> H2O + BA
One example of an acid-base reaction is the reaction of hydrobromic acid (HBr) with sodium hydroxide:
HBr + NaOH ---> NaBr + H2O

21. Exit Ticket 1. 2 NO2  2 O2 + N2 Reaction Type ______________________
2. C5H5 + Fe  Fe(C5H5) Reaction Type _______________________
3. CaCO3  CaO + CO Reaction Type _______________________