Use the internet as a tool to help you find answers to the following questions.

1.What is the chemical formula for dry ice?

2. What is the name of the phase change dry ice exhibits when changing directly from a solid to a gas?

3.How cold is dry ice?

4. Does liquid carbon dioxide exist? Where?

5. How cold is liquid nitrogen?

6. Does solid nitrogen exist? At approximately what temperature?

7. What is the percentage of nitrogen in our atmostphere?

8. What are three uses of nitrogen?

9. What is one use of liquid nitrogen?

10. Why do many things shatter easily after being placed in liquid nitrogen?