Today's Assignment

Key Words over section 2.2 and Chp 2 and 3 Reading guide was given today. Be prepared for a quiz Monday.
                                                                    Key Word Notes

1	2
3	4
5	6
Summary:

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Next Assignment:


Name __________________________________ Period _________
Ms. Foglia Date ______________________
1 of 3
2005-2006
AP: CHAPTER 2 & 3
CHEMICAL CONTEXT OF LIFE & WATER
1. What are the most common elements in the human?
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2. Helium has an atomic number of 2 and atomic mass of 4. Explain.
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3. Define isotope and give some examples.
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4. How are isotopes used in biology?
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5. What happens when electrons change levels?
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Name __________________________________ Period _________
Ms. Foglia Date ______________________
2 of 3
2005-2006
6. What is the significance of valence numbers?
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7. Why do atoms form covalent vs. ionic bonds?
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8. How do non-polar covalent bonds differ from polar covalent bonds?
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9. What is a hydrogen bond? How does it form and how is it different from a covalent bond?
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10. Sketch a few molecules of water, indicate their polarity, and where H bonds form.
Name __________________________________ Period _________
Ms. Foglia Date ______________________
3 of 3
2005-2006
11. Why is H bonding so important to water’s properties?
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12. List the “special” properties of water and give an example of why the property may be
important to living things.
a. ________________________________________________________________________
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b. ________________________________________________________________________
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c. ________________________________________________________________________
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d. ________________________________________________________________________
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