Post-test day for Unit 6

SYNOPSIS FOR FRIDAY, DECEMBER 20, 2013

TEST:
The class started off by taking questions about the test. Ms. Friedmann also stated she will grade the lab test over break. If you have not taken the test, please contact Ms. Friedmann.

LECTURES:
The next topic was the GBS Stoich-A-Thon that will take place after break. This is a day where our class, joined with others, will complete extremely difficult Stoich problems in order to prepare for the chemistry final the following week. This has been a hit in the past as well as a fund being raised simultaneously.

The "Spirit Fund" is established to allow students to participate in the school who are chosen to receive aid anonymously through socio-economic need. These students are among us are sometimes unable to participate in all the school activities due to life's other needs. The sincere expressions for participating in the life of the school makes the fund continue today. Life is more about Stoichiometry and the goal of this Stoich-A-Thon; it is helping other students in the process.

Ms. Friedmann then gave us an introduction to the 4-day unit that we will be completing before finals on the topic of nuclear chemistry. Ms. Friedmann made a point that this is more of a physics unit rather the chemistry.

She then began to show us "The Manhattan Project" video by National Geographic. This is a 50 minute video on that we were not able to finish in class due to time constraints. However, Mrs. Friedmann has posted the link to this 5-part documentary on YouTube. This will be posted on the Moodle page, so students have the opportunity to finish this video over the break.

This is the atomic bomb.

HOMEWORK:
The homework over break is to raise money for the "Spirit Fund" over winter break.
It would also be great if students could finish watching this video over the break.
It is optional to start studying for the dreaded finals with the review packet that Mrs. Friedmann will post on the Moodle page for whomever wants to begin reviewing.


The next blogger for the Monday after break is...Kevin M.

Solubility Lab

Solubility Lab

Class on October 31 (Halloween)

Written by: Jordan C.

After the class had a short discussion of Shakespearean iambic pentameter, we got down to business.

Remember that soluble means that the ionic bond is weaker than the water bond and therefore remains separated.

Going over the double replacement reactions and solubility lab:

• Pre-lab Questions: The class did not go over these because they were not assigned.
• Data: The data did not have to corrected because the rules as to the solubility and insolubility with cations and anions is more important. 
• Post-lab Questions: Ms. Friedmann gave an example of each of the questions and demonstrated how to find the answer to any of the class's requests. 

Question 1:

• Although the 2 possibilities for the possible precipitate were required, Ms. Friedmann saw this as an opportunity to demonstrate a balanced molecular equation for:

Combination of: Ba(NO3)2 and Na2SO4. 

Ba(NO3)2(aq) + Na2SO4(aq) ---> BaSO4(s) + 2 NaNO3(aq)

Ba(NO3)2(aq) + Na2SO4(aq) ---> BaSO4(aq) + 2 NaNO3(s)

Question 2: 

• The demonstration included the combination of Ba(NO3)2 + Na2CO3. She also showed the net ionic and ionic equations for practice. 

Molecular: 

Ba(NO3)2(aq) + Na2SO4(aq) ---> BaSO4(s) + 2 NaNO3(aq)

Complete ionic:

Ba^+2(aq) + 2 NO3^-(aq) + 2 Na+(aq) + SO4^-2(aq) --->BaSO4(s) + 2 Na^+2(aq) + 2 NO3

Net ionic:

Ba^+2(aq) + SO4^-2(aq) ---> BaSO4(s)

Question 3:

a) SO4^-2, halides (ions of halogens ) Cl^-, I^-

b) silver cations Ag^+1 and barium cations Ba^+2

Question 4: 

a) CO3^-2 carbonates, OH^- hydroxides, PO4^-3 phosphates

b) potassium cations K^+, sodium ions Na^+1 (THESE ARE ALKALI METAL IONS)

Question 5:

a) Bromine salts would be soluble because it is in the halogen family, and therefore is closely related with the other soluble halogens.

Question 6:

This is one of the most important aspects of the lab. All the information leads up to discovering the rules of solubility with cations and anions. 

Ionic Compounds:

• Carbonates: insoluble except alkali metals (sodium, potassium)
• Halides: soluble except silver
• Hydroxides: insoluble except alkali cations (K^+1)
• Nitrates: soluble except none :)
• Phosphates: insoluble except alkali cations
• Sulfates: soluble except barium (Ba^+2)
• Alkali Metal salts: soluble except none :)
• Ammonium salts: soluble except none :)

As class came to a close, we had the opportunity to make bubbles and bounce them off gloves. It was suuuuper fun. 

Thursday, 10/31 Homework

1) Complete the "Solubility Rules and Practice" worksheet (in the Unit 4 Handouts folder).  Due tomorrow.

2) WebAssign 4.2 -- Precipitation Reactions.  Due Sunday night, 11/3, 11:59 pm.

Next Post will be by...

Ambreen A.!