December 14- Double Replacement Lab

Today in class we mainly reviewed our results from the double replacement lab that we did yesterday(Monday the 13th). The equations from the lab are as follows: If you still have any questions about balancing equations than you should either talk to Mrs. M or go to the TLC because we will be having our quest about Balancing equations this Thursday(December 16th).

Today we were also given back our partner quizzes, in which we were informed that we didn't do to well on, so tonight for homework we have to correct them. If you were absent or still haven't taken the partner quiz then you can get it straight off the moodle. The answer key to the quiz will be posted later.

DON'T FORGET: Our chemthink and webassign are both due at 11:59 tomorrow night.

Study for our upcoming quest!

Chandler F.

Scribe Post: Thursday, November 9, 2010

Hello,
Today in class, everybody present collected an Activity Series sheet, which basically showed which metals and nonmetals were more/ less active.  Next, we read the lovely scribe post from last night.  After that, Mrs. M made a quick announcement.  She told us that she would not be in class tomorrow, that page twenty is our homework, we have a partner quiz tomorrow, and to be ready for a quiz monday, a quest next thursday, and a CSI/ Winter Break party next friday.  She also told us that we will be reviewing as well as starting the next chapter on both tuesday, and wednesday.  Afrer that, Mrs. M stamped, and reviewed page eighteen (last nights homework).  Page eighteen was about balancing equations.  When balancing, equations, it is essential to make sure you balance the equation.  How do I do that? You must be asking yourself right now.  Well, when balancing an equation, you must make sure to see that all the elements in the reactants and products are equal, like a teeter-toter.  Lastly, we did page nineteen, which was about predicting products.  You do this by seeing what kind of a reaction it is, depending on wheter it is a synthesis, decomposition, single replacement, double replacement, or combustion. 

Thats all folks.

Reactant Types

Today in class, we went over the homework from last night. Then, we talked about reactant types. There are five different types of reactants:

Shown using variables:

1. Synthesis(combination)= A+B ->AB

2. Decomposition= AB ->A+B

3. Single Replacement= A+BC->B+AC

**A must be more reactive than the element it is replacing (In this case it is B).

4. Double Replacement= AB+CD->AD+BC

5. Combustion= C6H12+O->6CO2+6H2O

** Combustion works with hydrocarbons. It will ALWAYS produce CO2+H2O.

Shown using formulas:

1. Synthesis: 2Mg+O2->2MgO

2. Decomposition: 2H2O->2H2+O2

3. Single Replacement: Cu+2AgNO3->2Ag+Cu(NO3)2

** If the element is less reactive than the element it is replacing, there will be no reaction.

4. Double Replacement: Pb(NO3)2+K2S->PbS+2KNO3

5. Combustion: C4H10+6.5O2->4CO2+5H20

Homework tonight is page 18. Don't forget!