State of Palestine
Ministry of Education
The Arabian Academy for Modern Education
SAT/AP Department
Name____________________________
Gr. 9
Date_______________________
Biology
Worksheet - Ch.2, S2-3
1st Semester, School Year 2021-2022
1. Write the correct vocabulary term in the left column for each definition below.

____________substance that releases hydroxide ions when dissolved in water

____________substance that releases hydrogen ions when dissolved in water

____________substance in which another substance is dissolved

____________mixture that can react with an acid or a base to keep the pH within a particular range

____________measure of concentration of hydrogen ions in a solution

____________substance that is dissolved in a solvent

____________weak interaction involving a hydrogen atom and a fluorine, oxygen, or nitrogen atom

____________molecule that has oppositely charged regions

____________mixture that has a uniform composition throughout

____________combination of two or more substances in which each substance retains its individual
characteristics and properties
Teacher: Ms. Haya Hmeedat
Page 1
State of Palestine
Ministry of Education
The Arabian Academy for Modern Education
SAT/AP Department
2. Identify the properties of water that allow it to help an organism maintain homeostasis.
3. Model a carbon atom, and label its parts. Then use a label to point out and briefly explain why carbon
can form a variety of organic compounds
Teacher: Ms. Haya Hmeedat
Page 2
State of Palestine
Ministry of Education
The Arabian Academy for Modern Education
SAT/AP Department
4. Describe the pH scale and how it relates to living systems. Give an example of how drastic pH changes
are prevented in living systems
5. Compare and contrast saturated and unsaturated triglycerides.
6. What property of carboxyl makes carboxyl containing molecules hydrophilic? Which macromolecules
contain carboxyl?
7. Discuss how buffers help prevent drastic swings in pH.
Teacher: Ms. Haya Hmeedat
Page 3