Dana



Purpose of the lab to see how long it would take for Alka-Seltzer to dissolve in hot tap, room temperature and ice water.Chemical reaction is a process in which substances undergo chemical change.The evidence is seen order to determine if a chemical reaction has taken place when we dropped the Alka-Seltzer in and it started to fizz and bubble.My original prediction of how long it would be to dissolve 4times faster than at 0 degrees C. The number of trial in the lab is 3. We start with room temperature.The temperature was 17.2 degrees C in 56 seconds. Then for the trial two, we did hot tap which is 81.9 degrees C in 20 seconds. Then, for the third, we did ice water which is 2.4 degrees C in 144 seconds. The evidence that I saw in each trial a chemical reaction took place was chemical reaction taking place when it started to bubble, fizz and dissolve. Based on my evidence predict how fast will other solutions may dissolve slowly or quickly depending on temperature. It was evident that the purpose of the lab was met because Alka-Seltzer actually dissolved.

experiment #3-release of gas

The new substance was indicate by release of gas. They did prepare for this experiment are 1/4 cup of baking soda, 4/1 cup of warm water, 1/2 cup of vinegar zipper-lock plastic bag, and paper tower. And then they told us to wear goggles and a lab coat. Then, they put sodium bicarbonate in to paper towel. They also put water and vinegar together in zip-lock. Finally, they put the sodium bicarbonate envelope into zip-lock then quickly sealed it. Because they put the sodium bicarbonate envelope into the zip-lock, things that started to making bubbles. And then the bag also blasted. The bag blasted because of carbon dioxide. Vinegar and baking soda was mixed, and they made explosion. In this experiment there weren't any factors affected the speed of the reaction. I think this an experiment that would take place in every day life or in a lab because vinegar and baking soda is very common items to use. I would like to try this experiment because it is interesting to look at and I wanna see the blasting scene. This video add my learning of science that I could realize some of chemical reactions are made of common material. media type="custom" key="12401592" **popplet summary**

**Benzene**
Benzene has covalent bonds. Each of carbons in benzene is hybridized.It uses of tire/rubber manufacturing, printing/painting, petroleum/oil/asphalt, chemicals/plastics, auto repair and exposure. Michael Faraday first isolated and indentified benzene in 1825 from oily reside derived from the production of illuminating gas, giving it the name bicarburet of hydrogen. Sometimes called benjamin an atomic resin known to European.Back to early 1900's when the first strong connections were made. They used before World War1

Chemical Bonding Lab:



We did a activity in the class that is called chemical bonding activity.So we made a compound using valence electrons. We made 16 compounds using eight valence electrons each. I enjoyed this activity because it was quite easy to me.The only thing we had to do is drag the electrons from the periodic table and drop them in the right spot. In this activity I found that we always have a sharing electrons. I had fun with this activity but I'm not really big fan of it.

**Solvent solute** **Hypothesis:** I think that the liquids will dissolve more easily.
 * Data table:**
 * Substance: || Solid/Liquid: || Soluble/Non-soluble ||
 * Salt || Solid || Soluble ||
 * Sugar || Solid || Soluble ||
 * Vinegar || Liquid || Soluble ||
 * Rubbing alcohol || Liquid || Soluble ||
 * Pepper || Solid || Non soluble ||
 * Powdered chalk || Solid || Non soluble ||
 * Baking soda || Solid || Soluble ||
 * Corn starch || Solid || Soluble ||
 * Vegetable oil || Liquid || Non soluble ||

When we did the experiment, we thought that salt is non soluble but it was actually soluble substance. Only it was saturated. Same with the baking soda. We weren't sure about baking soda is non soluble substance but it was soluble. So salt,sugar,vinegar,rubbing alcohol,baking soda,corn starch is a soluble substance however, pepper,powdered chalk,vegetable oil is non soluble substance.
 * Results:**

In my opinion of which substance dissolves more easily is liquid will dissolve more easily. The reason why I thought of this is because the liquid might blend to water more than solid. So my hypothesis was right. The liquid dissolves more easily. Also the water is polar. The molecules separate when the molecules react in the water. The observations that I could see indicated they dissolve is nothing. We don't see any particles in the solutions. Not every substance breaks into ions when it dissolves in water. A molecular solid such as sugar,breaks up into individual neutral molecules. The polar water molecules attract the slightly polar sugar molecules. This causes the sugar molecules to move away from each other. But covalent bonds within the molecules are undisturbed.
 * conclusion:**