Today's chemistry class was very busy! We started class immeadiatly following the bell when Mr.H told us to copy down the title and purpose of the first lab of Unit 4, Classifying Chemical Reactions Lab. This can be found on page 17 of your Unit 4 Packet. We then put that away and took a look at Tammy's blog from yesterday. Mr.H was very impressed by it, and said that it was a good resource.

Then, we got into our packet work. Mr.H reminded us that we should have read pages 5 and 6, because that is what we would be learning today. Pages 5 and 6 were about the types of reactions. The different types are:

Synthesis-remember 2 reactants -> 1 product ex. 2 H2 + O2 -> 2H2O

Decomposition-remember 1 reactant -> 2 products ex. 2 H2O -> 2 H2 + O2

Combustion-remember ALWAYS includes oxygen(O2) ex. CH4 + O2 -> CO2 + 2 H2O

Single Replacement-remember 1 element gets replaced ex. 2 Al + 3 CuCl -> 3 Cu + 2 AlCl

Double Replacement-remember 2 elements switch places ex. HCl + NaOH -> NaCl + H2O

**for more details and great pictures, go to pages 5 and 6 in your packet.

After going over the types of reactions, we did pages 3 and 4 in the packet. While doing those problems we were also told to classify the reactions. The answers are as follows:
1. 2 CU + S -> Cu2S Synthesis
2. Na2O + H2O -> 2 NaOH (no classified reaction)
3. 2 Na + 2 H2O -> 2 NaOH + H2 Single Replacement
4. 4 Na + O2 -> 2 Na2O Combustion
5. Ba(OH)2 +CO2 -> BaCO3 + H2O (already balanced, no classified reaction)
6. 3 Ca(OH)2 + 2 H3PO4 -> Ca3(PO4)2 + 6 H2O Double Replacement
7. 2 Al + 3 ZnCl2 -> 2 AlCl3 + 3 Zn Single Replacement
8. 2 Al(OH)3 -> Al2O3 + 3 H2O Decompostion
9. 3 Ti + 2 N2 -> Ti3N4 Synthesis
10. Fe2O3 + 3 CO -> 2 Fe + 3 CO2 (No classified reaction)
(END OF PAGE 3)
11. P2O5 + 3 H2O -> 2 H3PO4
12. FeS + 2 HCl -> FeCl2 +H2S
13. Cl2 + 2 LiI -> 2 LiCl + I2
14. Hg + O2 -> 2 HgO

Some helpful hints Mr.H gave us were that not every single reaction needs to be classified, and that you should first write the chemical reaction formula out, and THEN balance it.

Before we got into the lab, Mr.H told us about his Uncle Honclbrf and his children, his uncle named his children; Harry, Oliver, Nana, Clara, Brady, Isabelle, and Fred. He also said that they were weird because they had to of every single body part, 2 legs, 2 eyes, 2 noses, to mouths, ect.
Then Mr.H showed us this:

H2O2N2Cl2Br2I2F2

This was Mr.H's clever way of telling us that the elements Hydrogen(H), Oxygen(O),

Nitrogen(N), Chlorine(Cl), Bromine(Br), Iodine(I) and Fluorine(F) always have a subscript of 2 when they stand alone in a chemical equation. This is very important to remember!!!

Finally, we got into our lab groups and began lab CR1. We did not finish becuase the lab is long, but we will resume this lab on Thursday, not Wednesday, and finish it then.

Homework: Webassign due Wednesday, Novemeber 3