1. Draw atoms of 06 & 018, labeling the various parts of atoms and highlighting how these two are different from each other. What do we call different atom versions of the same element? 2. Differentiate between the terms atomic number, mass number, and atomic mass. 3. Considering radioactive decay, why is half-life an important concept? 4. Identify 2 ways the octet rule is important in chemistry. 5. Compare & contrast the 3 major types of chemical bonds, including how each forms and what types of things each bonds together. 6. Identify the types of energy in biological systems. Describe the laws of energy. 7. Describe at least 3 reasons why water is a biologically important molecule. 8. Differentiate between acids and bases. Explain why acidic solutions have lower pH values than basic solutions. 9. Define "buffer" and explain why buffers are important. What is the normal pH range for most tissues? 10. Define "salt" and describe how a salt is similar to an acid or a base but why most salts are not acids or bases. 11. Briefly describe how a "typical" chemical reaction occurs (be sure to name the important items in reactions). Describe 5 named types of chemical reactions. 12. What is an enzyme? Explain why enzymes are important for biological systems. 13. Summarize the general structures and functions of the major classes of biological organic molecules.