Science Homework. Help please.?

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Shell the Hollister lover

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I have a science questions and i was hoping that someone would help me :D!

1. (I have a diagram of a nicotine compound, it contains 10 carbon atoms 13 hydrogen atoms and 2 nitrogen atoms)
i. Nicotine is a compound. How does the diagram show this?
ii. when nicotine in a cigarette is burned in air, nitric acid is formed from the nitrogen in nicotine. Look at the elements in nicotine. Give the names of two other compounds formed when nicotine burns in the air.
1.
2.

3. What is a compound

4. The shuttle for a spacecraft carries a separate fuel tank containing Liquid hydrogen and liquid oxygen.
i. Explain why hydrogen and Oxygen are carried as liquids.
ii. Oxygen is needed to burn the fuel in shuttle's engines Vehicles on earth do not need a tank containing oxygen. why does the shuttle need a tank containing oxygen.


Thankyou
 
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