#2: Dry Ice (Extra Credit)
Bonus Time Frame: February, 2010
Bonus Credit Available: 5 pts max.
Added to: Your lowest lab or quiz grade for the 9 weeks
Directions: Click on the link provided to find the Internet article. Read the article. Write down the questions and provide a complete sentence answer to each question. Neat handwriting required, word processing preferred.

BONUS #2
The Many Uses of Dry Ice
dryiceClick on the picture or the link. Read this article about the many Uses of Dry Ice and then write down and answer the questions below in complete sentences.

1. Why is dry ice good for getting rid of bed bugs?
2. Click on the motorcycle gas tank link to find out the answer to this question -- Why is dry ice is good for repairing a motorcycle fuel tank?
3. Why does dry ice spice up food?
4. Scientists want to combine amorphous silica with amorphous carbon dioxide. What properties would the resulting glass have?
5. What is "cloud seeding?"
6. Click on the link to answer this question: How do you use dry ice to get a spoon to sing?
05 Feb 2010
by MrC


#1: Calcium Carbonate (Extra Credit)
Bonus Time Frame: February, 2010
Bonus Credit Available: 5 pts max.
Added to: Your lowest lab or quiz grade for the 9 weeks
Directions: Click on the picture or the link provided to find the Internet article. Read the article. Write down the questions and provide a complete sentence answer to each question. Neat handwriting required, word processing preferred.

BONUS #1
Calcium Carbonate Reveals Secrets of Ancient Sea Water
calciumcarbonate Scientists have found that calcium carbonate preciptates out of sea water and forms deposits in the rock on the ocean floors. They have been able to analyze these deposits to figure out what the oceans were like millions of years ago. Click on the picture or the following article LINK to read this article and then write down and answer these questions:

1. Was the Strontium-to-Calcium ratio higher or lower 25 million years ago?
2. Was the Magnesium-to-Calcium ratio higher or lower 25 million years ago?
3. Why do scientists think these values have changed?
4. What is the chemical formula for calcium carbonate?
5. What type of rocks did scientists examine that contained veins of calcium carbonate?
05 Feb 2010
by MrC