Chapter 2: The Chemistry of Life

Chapter 2: The Chemistry of Life
Guided Reading Activity
Module 2.6 pH is a measure of the acidity of a solution.
Answer the following questions as you read the module:
1. A solution where water is the solvent is called a(n) solution.
2. Label the diagram with the following terms: hydroxide ion and hydrogen ion.
3. What are two negative effects of too much acid in nature?
4. Complete the pH scale with the following terms/phrases: greater H+, lower H+, H+ = OH−.
5. As the pH increases the [ H+ ] ____, and as the pH decreases the [ H+ ] ____.
A) decreases; increases
B) increases; decreases
C) increases; stays the same
D) decreases; stays the same
6. Complete the following table regarding acids and bases.
Acids Bases
Effect on H+ when dissolved in H2O
pH range
Example
7. The pH in your cells is dropping. You have buffers to minimize this change in pH. Briefly explain what the buffer would do in
this situation with respect to the H+ concentration in your cells.
Guided Reading Activity
Module 2.7 All life on Earth is based on carbon.
Answer the following questions as you read the module:
1. The element is essential to an organic compound.
2. What is meant by the term carbon skeleton, and how can carbon skeletons vary?
3. Is the following molecule an organic compound?
4. The oxygen atom in ethyl alcohol forms a polar covalent bond with the carbon atom. Does ethyl alcohol readily interact with
water? Hint: Revisit module 2.5 if necessary.
5. Identify any functional groups from the following molecule.
6. help to determine the overall properties of molecules.
7. Complete the table that describes the four classes of large biological molecules.
Carbohydrates Proteins Lipids Nucleic acids
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