Observation
First there was a single light. Then tube with gas in it was pink. When he changed it it was orange. It continued to change colors. Orange is neon.
When we put on the glasses there were rainbow colors reflecting off of all the lights in the room like on a cd. When looking at the gas tube there are several lines all around it. The lines all form a straight line looking like there next to the gas tube. This gas was Neon.There were a lot of red and orange lines on this one. I can see several lines on this spectrum.
The next gas that the professor switched it to was a tan color. This gas was Helium. There horizontal lines were more blue and green with a little bit of light pink. There are fewer lines in Helium than most of the others.
The next tube shown was Argon. To the right and left of the the Argon there are horizontal lines kind of like a rainbow. You can see many colors on this spectrum but purple sticks out to me. The tube of Argon was a light pink.
The next tube was Nitrogen. It shows many of the rainbow colors. Left to right is red, orange, yellow, green, blue, and purple.
The next tube was Carbon Dioxide. There is a lot of different colors on this spectrum. I notice a lot of variations of green and blue. To the left there are some red and oranges. The green sticks out the most.
Thursday, January 20, 2011
Activity 2 - Antacids
Write the formula for Tums? How does Tums chemically react with water and stomach acid?
CaCO3 (Calcium Carbonate)
Insoluble Compound in Water.
CaCO3 ---> Ca + CO3
CO3 + H ---> HCO3 + H ---> H2CO3 ----> H2O + CO2
<----
How many Tums are needed to neutralize a can of coke?
CaCO3 (Calcium Carbonate)
Insoluble Compound in Water.
CaCO3 ---> Ca + CO3
CO3 + H ---> HCO3 + H ---> H2CO3 ----> H2O + CO2
<----
How many Tums are needed to neutralize a can of coke?
Coke is much more acidic than a normal stomach. So you would need about 4 or 5 tums to neutralize the can of coke.
Activity 1 - Experimental Design and Conclusions
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.
I did my experiment using an ice cube tray. I then filled one side with only water and the other side with different amounts of salt mixed in with the water. The ice cube tray slots were each about 1 inch. The slots that only had water in them expanded out of the slots and up over the edges about 2 cm. The water that had the salt mixed in with it hardly came over the edges at all in a way that was difficult to measure. The pure water expanded much more than the water mixed with salt. This is because salt causes freezing to take longer because it continues to melt the ice. The salt water lowers the freezing point therefore taking longer to freeze over than just pure water. I found it very interesting that the research that I came up with said that pure water expands about 9% when it is frozen. It was very interesting to see the expansion before my eyes. I checked on the water and salt water mixture every 25 minuets until it was frozen. This was I could observe the exact changes that were occurring right before my eyes. The salt water mixture not only took longer to freeze, but it also was not expanding much at all. The salt water was so slushy that it made things hard to measure. This is when things get difficult. The struggle with this experiment is that it is hard to measure expansion. However this was a very interesting experiment to conduct.
Relate your thoughts on this experiment to the scientific question "Is the earth warming?"
Global Warming is a controversial topic and has been for many years. This relates to our experiment because it is something that is difficult to measure and then draw up a solid conclusion. From my research I have found that the earth has been continuing to warm and then cool down for over 20 years. The observations that are being done about the earth's temperature have been taken over years. The issue with measuring the temperatures over time of planet Earth is that there is not control to compare anything to. It is very difficult to check the CO2 of the earth because there is nothing to compare it to.
I did my experiment using an ice cube tray. I then filled one side with only water and the other side with different amounts of salt mixed in with the water. The ice cube tray slots were each about 1 inch. The slots that only had water in them expanded out of the slots and up over the edges about 2 cm. The water that had the salt mixed in with it hardly came over the edges at all in a way that was difficult to measure. The pure water expanded much more than the water mixed with salt. This is because salt causes freezing to take longer because it continues to melt the ice. The salt water lowers the freezing point therefore taking longer to freeze over than just pure water. I found it very interesting that the research that I came up with said that pure water expands about 9% when it is frozen. It was very interesting to see the expansion before my eyes. I checked on the water and salt water mixture every 25 minuets until it was frozen. This was I could observe the exact changes that were occurring right before my eyes. The salt water mixture not only took longer to freeze, but it also was not expanding much at all. The salt water was so slushy that it made things hard to measure. This is when things get difficult. The struggle with this experiment is that it is hard to measure expansion. However this was a very interesting experiment to conduct.
Relate your thoughts on this experiment to the scientific question "Is the earth warming?"
Global Warming is a controversial topic and has been for many years. This relates to our experiment because it is something that is difficult to measure and then draw up a solid conclusion. From my research I have found that the earth has been continuing to warm and then cool down for over 20 years. The observations that are being done about the earth's temperature have been taken over years. The issue with measuring the temperatures over time of planet Earth is that there is not control to compare anything to. It is very difficult to check the CO2 of the earth because there is nothing to compare it to.
Wednesday, January 19, 2011
Homework Assignment 5
Use the pH paper to develop a table and graph of the pH of common things around your home. Think in terms of at least 10 different liquids.
I made a chart of all of the information that I needed to gather about the pH levels of 10 different liquids that I could find in my dorm room. I found it interesting that I could not find anything that would be a 9 or a 10. This was an interesting experiment to find out how acidic the everyday things really are.
I made a chart of all of the information that I needed to gather about the pH levels of 10 different liquids that I could find in my dorm room. I found it interesting that I could not find anything that would be a 9 or a 10. This was an interesting experiment to find out how acidic the everyday things really are.
Liquids | pH2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Milk | X | ||||||||
Red Bull | X | ||||||||
Apple Juice | X | ||||||||
Cranberry Pomegranate Juice | X | ||||||||
Cinnamon Sugar Febreze | X | ||||||||
Nail Polish | X | ||||||||
Shampoo | X | ||||||||
Water | X | ||||||||
Juice from a can of Corn | X | ||||||||
Hairspray | X |
Develop an experiment to see how much antacid is needed to neutralize an acidic liquid.
For my experiment I used about a 1/2 cup of Apple Juice. I then took a Tums and crushed it up into tiny pieces. I continued to add about a 1/2 a teaspoon at a time and then used to pH paper to test it. It took pretty much the entire Tums to even out the pH level. I finally got about a 7 on the pH scale which is the average and good level.
For my experiment I used about a 1/2 cup of Apple Juice. I then took a Tums and crushed it up into tiny pieces. I continued to add about a 1/2 a teaspoon at a time and then used to pH paper to test it. It took pretty much the entire Tums to even out the pH level. I finally got about a 7 on the pH scale which is the average and good level.
Ph3 and Ph4
Ph3 and Ph4 Which is more acidic?
Ph3 is more acidic than Ph4.
How much more acidic is it?
Ph3 is 10 times more acidic than Ph4.
Ph3 is more acidic than Ph4.
How much more acidic is it?
Ph3 is 10 times more acidic than Ph4.
Activity 4 - Dissolving
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?
Why is the freezing point lowered when salt is added to water?
Water molecules form crystals when freezing. The salt gets in the way of the water molecules, making it harder for them to become re-arranged into crystals. It then takes longer for the salt water to freeze because the salt is in the way and needs to wait for the temperature to continue to reduce.
Activity 3 - Crystal Structures
Show crystal structures fo NaCl (sodium chloride)and CaCO3 (calcium carbonate). what is the melting point for these two materials
NaCl (Sodium Chloride)
CaCO3 (Calcium Cabonate)
Melting Points:
* Sodium Chloride = 801 °C, 1074 K, 1474 °F
* Calcium Carbonate = 825 °C, 1098 K, 1517 °F
NaCl (Sodium Chloride)
CaCO3 (Calcium Cabonate)
Melting Points:
* Sodium Chloride = 801 °C, 1074 K, 1474 °F
* Calcium Carbonate = 825 °C, 1098 K, 1517 °F
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