The Scream Heard 'Round the World

Today, class started off with Mr. Lieberman telling everyone to get out their Classifying Chemical Reactions Lab so we could go over the post-lab questions, which asked you to find the equations for some experiments that you did during the lab. People wrote the answers on the board and we cleared up any questions about them. For answers see Brandon L's previous post that described the lab's experiments and their equations.

After we finished discussing the lab, we moved on to the notes for the day. Although we only got through the first part of the notes, we still learned a lot about solutions, and how electrolytes and ions are related. Mr. Lieberman explained that a solution contains a solute, which dissolves, and a solvent, which is what the solute dissolves into. He also explained how water was the most common solvent. As a solvent, water dissociates ionic compounds into its ions. For example if you dissolved table salt (NaCl) into water, then one would see each individual ion separately, because water breaks the Na+ and Cl- apart.

We started to talk about electrolytes, and the difference between strong and weak electrolytes. I general, electrolytes are allowed to pass through a current if there is a sufficient amount of ionization. Strong electrolytes contain enough ions to carry a current efficiently, while weak electrolytes don't completely dissociate and have a small amount of ionization.

To give us a visual of how electrolytes and ions really worked, Mr. Lieberman performed the light bulb experiment. First he used sugar to see if he could light the light bulb. To fake out the class he screamed to make it seem like there was going to be light. Sure enough, the infamous Korri then proceeded to shriek so loudly, that it was heard around the country, and maybe even the entire world because it was as if every students ear drums were being punctured and then completely ruptured. Mr. Lieberman then demonstrated how the sugar, which has no ions, didn't light the light bulb. He then mixed salt and water together. The water acted as the solvent and the salt was the solute. Na+ and Cl- ions were formed and the light bulb irradiated a lot of light.

You can check out this video, as a woman explains electrolytes and currents.

That's it for class on November 4th.

The next scribe will be the oh so special, John A.

Can You Classify Chemical Reactions because I hope I can

Today and yesterday in Lieb's class we started off by talking about the 3 worksheets we need print off of moodle after this we began our class notes on the 5 types of reactions: Synthesis, Decomposition, Single Replacement, Double Replacement, and Combustion Reactions.

A synthesis Reaction is when you are given two reactants that combine to give you one product for example: 2H2 + 02 -----------> 2H20

A Decomposition Reaction happens when compunds are broken into elements or similar compounds. Example: 2H20 ---------> 2H2 + 02

A Single Replacement Reaction is when an element replaces another compound. These only take place in wate. Example: NaCl + F2 ---------> NaF + Cl2

A Double Replacement Reaction happens when one metal replaces another in a compound and the same for the non-metals. Example: AgN03 + NaCl ----->AgCl + NaN03

A Combustion reacion only occurs when a hydrocarbon reacts with oxygen gas. Example: C5H12 + 802 ------>5CO2 + 6H20

Now on to the Classifying Chemical Reactions Lab YES!!!!!!!!!!!

So, to begin with we went over the Pre-Lab in Question 1 we had to summarize the chemical reaction of sodium bicarbonate, carbon dioxide, and water. This turned into

2NaHC03-----> C02 + H20 + Na2C03. When balanced.

We then had two days to go through the 7 different stations and do all the experiments. In reaction 1 We Burned Magnesium ribbon. The Magnesium ribbon lit on fire and got chalk white after it burned. The chemical Reaction that occured was 2Mg + 02 ----> 2Mg0.

In the first picture we see the product of the Magnesium ribbon turning pure white and in the second it is lighting on fire.

In reaction 2 we put hydrochloric acid in a test tube with Magnesium Metal, and then we lit a wood splint and put it in the tube where it was extinguished. These turned into

2HCl+ Mg ----> MgCl2 + H2

The answer above has been balanced. In this picture we see the hydrochloric acid and Magnesium Metal Ribbon mixing and bubbles occuring.

In reaction 3 we put ammonium carbonate in the test tube an burned for 30 seconds then we put a piece of litmus paper at the top and an odor was released. This odor was amonia next we put a piece of wood flint on fire into the tube which was extinguished. The reaction for this was (NH4)2C03---> C02 + NH3 + H20 when balanced.

In this picture we see the mixture of amonia being released.

In reaction 4 we put calcium carbonate in a test tube with hydrochloric acid and once again lit a wood splint which was extinguished.

This reaction when balance became 2CaC03+ 2HCl-----> 3C02 + 2CaCl + H20.

In the second picture we see the wood splint being extinguished.

In the first picture we see the Calcium Carbonate and hydrochloric acid mixed.

In reaction 5 we mixed copper (II) Chloride and mossy zinc together and the mozzy zinc change color from silver to read. CuCl2 + Zn-------> ZnCl2 + Cu. When balanced.

In this picture we see the zinc changing color.

In reaction 6 we added copper chloride with sodium phosphate and a precipitate formed. When this reaction was balanced it became

3CuCl2 + 2Na3P04------> Cu3(PO4)2 + 6NaCl

In this photo you can see the precipitate forming.

In reaction 7 we mixed sodium hydroxide and phenolphthalein and the hydrochloric acid. During this reaction it at first became pink and then back to clear liquid color whise. In this reaction when balanced it became NaOH + HCl-----> H20 + NaCl As you can see in the pictures below it demonstrates the pink on the right and then clear again on the left

Well that was our class in a nut-shell and the coveted spot of scribing for Thursday goes to my man Josh D CONGRATS!!!

Intro to Balancing Equations

We started off the class today by going over the notes

Balancing equations

View more presentations from gbsliebs2002.

two very important rules to remember, and that Mr. Lieberman was very persistant in reminding us was:

1. DO NOT CHANGE THE SUBSCRIPTS

2. There are no stead fast rules to balancing equations, so the best way to master this skill is to practice, practice, practice.

After showing us these liberating notes he demonstrated a couple experiments for us. Both of which come with an entertaining story.

1. The Water from hydrogen and oxygen eperiment

It all started when Mr. Lieberman was taking a strol in deserted mountains with no one around and no water. Why he was walking in the heat without water or people in general is a mystary to us all. Well, while he was on this hike he got thirsty, but without any water and no connection to civilization he was stuck in the middle of nowhere without a source of water. This caused a problem for Mr. Lieberman, but it just so happened that a hydrogen spring was there and he was carrying two rulers, a balloon and a match. Attaching the balloon, which he had filled up with hidrogen from the spring, to one of the rulers he was ready to make water. His idea was that if he caused a reaction to occur he could make H2O out of the hydrogen and the oxygen in the air. He ran the experiment and low and behold, there was water (or at least some form of it). He demonstrated this awesome experiment in our class:



Along with this riviting story, came the story of his pet elephant Stampy:

Now Mr. Lieberman owns a pet elephant and this elephant is known as Stampy. Stapmy has needs just like any other elephant, and this includes brushing his teeth. Mr. Lieberman being the thoughtful man that he is makes his own elephant toothpaste, just for his Stampy. He demonstrated the making of this special toothpaste for us in class:



These stories made the class interesting and educational, depicting scinerios that use the topics we are learning of in class. Don't forget to write up the prelab including any tables needed for the procadure. If you don't do that you will get no credit for the WHOLE prelab, as I have had to learn from experience.

And now your next scribe will b.......Brandon L. Congrats

Friday's Class

Today in class was great because we got our tests back from the day before. This test was all about moles, but not this type of mole:



this type of mole:



We used this on the test and many people did very well. After answering all of the quetions about the test, we got time to go over to the computer lab and work on the ChemThink that is due on Monday. Make sure you finish that if you have not done so already. The next scribe will be....Mollie M!!!