When I put the glasses on I see.....
#1 Neon
I saw a stripe of a rainbow along the bottom. These colors are really bright!
-red
-orange
-green
-a rainbow
#2 Helium
I saw the rainbow again but this time it was super distingished between the colors. I saw a rainbow stripe on the top and on the bottom. These colors were not as bright as the neon.
#3 Nitrogen
I saw the rainbow stripes again.
#4 Carbon Dioxide
I see the rainbow lines on top and on the bottom. These lines are further apart and very bright.
Thursday, January 20, 2011
Day Seven: Activity Two
Write the formula for Tums? How does Tums chemically react with water and stomach acid?
CaCO3--> Ca+2 + CO3-2
CO3-2 + H+ --> HCO3- + H+ --> H2CO3 <---> H2O + CO2 "Sizzling" Evolution of gas
CaCO3--> Ca+2 + CO3-2
CO3-2 + H+ --> HCO3- + H+ --> H2CO3 <---> H2O + CO2 "Sizzling" Evolution of gas
How many Tums are needed to neutralize a can of coke?
It would take alot of Tums to neutralize a can of coke. Maybe like 4 or 5.
Day Seven
Reflect on the expansion of water and salt water experiments you and your classmates performed. What are some of the interesting results and struggles with this experiment.
Some results that I found interesting was that when salt was added to the ice it got colder, I thought that when we added the salt it would make it warmer since it had melted the salt. Another thing I found interesting was that I thought when ice froze it would expand a greater amount but according to my data and some other classmate's results the ice didn't expand much. Some struggles with this experiment was that it was hard to measure how much the ice had expanded each time we checked it. Another thing I found hard was to take the temperature when the ice froze because I had to break a little hole into it so that I could get the thermometer in the ice. Looking over other classmates was also interesting because everyone did something different for their experiments and everyone got different results.
Some results that I found interesting was that when salt was added to the ice it got colder, I thought that when we added the salt it would make it warmer since it had melted the salt. Another thing I found interesting was that I thought when ice froze it would expand a greater amount but according to my data and some other classmate's results the ice didn't expand much. Some struggles with this experiment was that it was hard to measure how much the ice had expanded each time we checked it. Another thing I found hard was to take the temperature when the ice froze because I had to break a little hole into it so that I could get the thermometer in the ice. Looking over other classmates was also interesting because everyone did something different for their experiments and everyone got different results.
Relate your thoughts on this experiment to the scientific question "Is the earth warming?"
According to some classmates it seemed like there water was taking longer to freeze when put outside, which could relate to global warming. I put my water into our freezer for this experiment so I looked at others to see their results compared to outside. We could create an experiment to test this if we put the same amount of water in the freezer and then the same amount outside and then checked them at the same time to see how they compare. When I think about this question I think about right now outside we get snow and it gets warm and melts the snow then it freezes again once it gets cold and it goes back and forth freezing and melting freezing and then melting.
Wednesday, January 19, 2011
Homework Day Six
Liquid | Ph Level |
Deodorant | 4 |
Proactive solution toner | 6 |
Mouthwash | 6 |
Solumel Stain Remover | 8 |
Spit | 8 |
Pickle juice | 6 |
Vodka | 6 |
Beer | 6 |
Lemonade | 4 |
Clorox bathroom cleaner | 10 |
Experiment
We than went on to make an experiment with the pH levels in finding how to neutralize the level of stain remover. We decided to mix the stain remover solumel with the antacid tums. We chose solumel because this had a pretty high pH level of 8. We found that in order to neutralize the solumel all we needed was ¼ of a tum. This put the pH level at 7, and that is the neutral level. Adding more tum does not change the pH level of solumel, the solution stays neutral no matter what.
Antacid amount (Tums) | pH of Solumel |
¼ of tum | 7 |
½ of tum | 7 |
¾ of tum | 7 |
1 tum | 7 |
Day Six: Activity Five
pH3 compared to pH4?
Something with a pH level of 3 is lower than something with the pH level of 4. Also the pH3 has a lower acidic level compared to pH4.
4 = -log H+ 10,000
3 = -log H+ 1,000
1.Which is more acidic? pH 4
2. By how many times? 10 times
Something with a pH level of 3 is lower than something with the pH level of 4. Also the pH3 has a lower acidic level compared to pH4.
4 = -log H+ 10,000
3 = -log H+ 1,000
1.Which is more acidic? pH 4
2. By how many times? 10 times
Day Six: Activity Four
Show an image or animation or description of what is happening when water dissolves NaCl.
Why is the freezing point lowered when salt is added to water?
Water molecules form crystals when freezing. Na+ and Cl- ions from the salt get in the way of the water molecules, making it harder for them to become re-arranged into crystals. This means that salt water remains in a liquid state for longer as the temperature reduces.
Day Six: Activity Three
Show crystal structures for NaCl (sodium chloride) and CaCO3 (calcium carbonate). What is the melting point for these two materials?
NaCl:
Melting Point: 801 degrees C or 1473.8 degrees F
CaCO3:
Melting Point: 825 degrees C or 1517 degrees F
NaCl:
Melting Point: 801 degrees C or 1473.8 degrees F
Melting Point: 825 degrees C or 1517 degrees F
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