Ionic Equations Galore!

Friday's class was mostly a notes and independent work day. Mr. Lieberman started off by continuing his lecture about molecular and ionic equations.

The molecular equation is just another name for a balanced equation, which we learned how to do several classes ago. It's important that your molecular equation is written correctly before going any further, so make sure you pay attention that everything is correctly balanced. If not, the whole process afterward will be incorrect. Next, Mr. Lieberman introduced two new terms: complete ionic equations and net ionic equations. The complete ionic equation is the balanced equation with all the strong electrolytes written in as separate ions. So, for example, to make this molecular equation:

KCl + AgNO₃ ➝ KNO₃ + AgCl

into it's complete ionic equation, you would find out the electrical charge of each of the elements except for the precipitate. So, it would look like this:

K⁺ + Cl^- + Ag⁺ + ➝ AgCl + K⁺ +

Every element shows it's electrical charge except AgCl since that is the precipitate [solid] formed. Lastly, Mr. Lieberman talked about a net ionic equation, which only includes the ions that undergo a change. That means that the spectators [ions that do not undergo a change] are not included. So, looking at the complete ionic equation above, the net ionic equation would be:

Cl^- + Ag⁺ ➝ AgCl (s)

And that was basically all we did for the notes! After that, we had the rest of class to work on the Net Ionic Equation Worksheet. If you don't have it or have lost it, you can download it here and if you would like to check your answers, click here. Mr. Lieberman also mentioned that you should have done the Dissolving worksheet we got a couple days ago before attempting this one. The answers for that worksheet is here.

So that was Friday's class! Homework for Monday is the Chapter 4.2 Webassign and the Pre-Lab for the Double Replacement Reactions and Solubility Lab [to download, click here]. Also for the lab, make sure you create a data table! It's supposed to be a 6 x 8 grid with the rows and columns labeled with the anion solutions and cation solutions respectively.

Oh, and the scribe for Monday will be Declan G. Good luck! :]

Observation Lab: Day 2

Today's agenda for Chemistry was pretty much a continuation of yesterday's class.

We began with a small lecture from Mr. Lieberman regarding Chem Think, a website that teaches chemistry concepts through interactive, animated online activities. One of our homework assignments for today involves Chem Think, and that's to sign up [click here to learn how to sign up] and to complete the Introduction: Particulate Nature of Matter tutorial and question set. That's due tomorrow.

Mr. Lieberman also handed out a Particulate Nature of Matter worksheet and that is to work on as well.

After that lecture, we went back into our lab groups and finished up our Observation Lab.

Here are some photos to visually summarize some parts of the lab:

The first photo shows the main substances we worked with: Calcium chloride, sodium bicarbonate, and phenol red.

The second shows one of the reactions that occurred: bubbles and fizzing.

The third shows what Part A of the procedure looked like before mixed.

And lastly, the fourth photo showed what the substances looked like when mixed together.

After we finished our lab, we cleaned up and went back to our desks to work on the Post-Lab questions using our data. [Here is one of Mr. Lieberman's examples of lab data found on Moodle in case you don't have it.]

So that was pretty much what went on today in class.

HOMEWORK is to finish the Observation Lab, do the Chem Think assignment as mentioned earlier, and to work on the Particulate Nature of Matter worksheet!

Oh and the next scribe is...................................................Stuart P.

Good luck!