Jenna

Alka Seltzer Lab:
The purpose of this lab is to see how fast alka seltzer desolves in different temperature. The chemical reaction is material changing into a different substance with different properties. Color changes, bubbles and precipitation occur when a chemical reaction take place. I predicted that using hot water out of the tap, the rate of reaction will be 829 times faster than at 0 degrees Celsius. I tried three times in the lab. This is a table and chart that shows my observation.
 * || ===Hot=== || ===Room=== || ===cold=== ||
 * ===Temperature===

(Celsius)
|| ===43=== || ===18=== || ===0.8=== ||
 * ===Time=== || ===22sec=== || ===1min 11sec=== || ===3min 28sec=== ||

Color changed and bubble occurred during the chemical reaction. As temperature increased, the rate of reaction got faster. At a temperature a of 10 degrees C, it would take approximately a minute for 1 Alka-Seltzer tablet to react with 8 oz. of water. If the temparature is doubled from 20 degrees C to 40 degrees C, the time for the rate of reaction increase by approximately three times faster. Using hot tap water, the rate was nine times faster than at 0 degrees C. It was evident that the purpose of the lab was met because I could find how much chemical reaction got faster in different temperatures.

=Summary of a experiment from video=

=
In experiment three, they used zipper-lock plastic bag, paper towel, baking soda, vinegar and warm water to see how catalyst works. They first placed some baking soda on paper towel to use it later. Then they put warm water and vinegar to the plastic bag, added baking soda and quickly sealed it. The chemical reaction occurred very quickly between vinegar and warm water because baking soda worked as a catalyst. They could see how catalyst worked in a chemical reaction. As a result combination of vinegar and warm water produced carbon dioxide and catalyst, baking soda, didn’t involve in the chemical reaction although it helped to occur it faster.======

[[image:2012portfolios/Water.jpg width="480" height="415"]]
====By researching water compound for my popplet, I found out that water is formed by covalent bonds and learned what covalent bonds are. Also, I found out a scientist named Cavandish discovered what water consists of. Before doing research, I thought I know pretty much everything about water because water has been always part of my life but after doing this, I found that there's lot more to know about water.====

Chemical bonding activity


====By doing this activity, I learned how the chemical bonds work in the compound. I had a worksheet that I filled it up while doing this activity and it helped me understand the concept better. Although it was hard to draw every single illustration of each compound, that helped me enough to understand about chemical bond. Here is picture of this activity.====

=Essay questions= = =

====The coolant in a car radiator is a solution made of water and a liquid called antifreeze. This antifreeze freezes at -13 degrees celsius and boils at 176 degrees celsius. So this coolant protects the engine from both overheating and freezing because it freezes at lower temperature and boils at higher temperature.====

====In an ionic compound, the positive and negative ions are attracted to water molecules. Then water molecules surround each ion as it leaves the surface of the crystal. As each layer of the solid is exposed, more ions can dissolve.====

====Molecular compound, however, 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. Like ions, the sugar molecules become surrounded by water.====

3. Describe how you would separate the parts of a water-and-sand suspension as compared to how you would seperate the parts of a water-and-sugar solution.
====The suspension and solution can be seperated in different way. The suspension is a meterial that can easily be seperated from settling or filteration. For a water-and-sand suspension, I would use filteration. The solution can't be seperated easily but boiling them would seperate them. If you boil the water-and-sugar solution, water will evaporate to air and sugar would be left.====

Conclusion of a experiment:
====We did a experiment to find out which substance dissolves more easily: solids or liquids. My hypothesis was that liquids will dissolve better because liquids have farther distance between molecules. But it comes out that I was wrong and neither solids or liquids dissolve better. It doesn't matter if the substance is solid or liquid, what matter is that what are solutes made of.==== Water is polar and molecules seperated when it react in water, When substance dissolves in water you don't see any layers or particles in the solution. But when the solute and solvent has same color it is hard to tell if the solute is dissolved or not.

Lab report:

 * Hypothesis:** I think liquids will dissolve better than solids.


 * Data Table:**
 * **Substance** || **Solid/ Liquid** || **Soluble/ Non- Soluble** ||
 * Salt || Solid || Soluble- saturated ||
 * Sugar || Solid || Soluble ||
 * Vinegar || Liquid || Soluble ||
 * Rubbing alcohol || Liquid || Soluble ||
 * Pepper || Solid || Non soluble- suspension ||
 * Powdered chalk || Solid || Non soluble ||
 * Baking soda || Solid || Soluble ||
 * Corn starch || Solid || Soluble ||
 * Vegetable Oil || Liquid || Non soluble ||


 * Results:** Our group had one trial for each substance. When we placed the solids such as salt in the solution, first it slowly fell down to the bottom of the cup. Then we stir the solution and it dissolved into the solution. When we placed liquids such as vinegar in the solution, it just mixed into the solution. I could observe that some substances dissolved well because I didn’t see any particles or layers. But for some of the substances like pepper and vegetable oil, it was obvious that they are non soluble because I could see the particles on the water or layer between water and oil. But for some of them like salt and rubbing alcohol, it was hard to tell if the substances are soluble or non soluble because the solution was saturated or it has same color with water. So we googled it to identify if the substances are soluble or non soluble.


 * Conclusion**: We did a experiment to find out which substance dissolves more easily: solids or liquids. My hypothesis was that liquids will dissolve better because liquids have farther distance between molecules. But it comes out that I was wrong and neither solids nor liquids dissolve better. It doesn't matter if the substance is solid or liquid, what matter is that what solutes are made of. Water is polar and molecules separated when they react in water. When substance dissolves in water you don't see any layers or particles in the solution. But when the solute and solvent has same color it is hard to tell if the solute is dissolved or not.