Chapter 2: Atoms, Molecules, and LifeLinks |
At its most basic level, life is an assemblage of atoms and molecules. Each of our cells is a complex mixture of chemicals. Even our thoughts are transmitted by movements of atoms and molecules and are stored as chemical changes in our neurons. These links help you explore the nature of atoms and molecules, including the most common molecule in living organisms—water.
Chapter Links
1) What Are Atoms?
This series of lecture slides from a chemistry course at the University of Akron is a great place to review information about atoms and molecules. The slides are very well done and organize information well. You can also take a practice exam to see how well you learned the material.
The general structure of atoms is diagrammed here, with particular reference to the nature of radioactive isotopes.
Basic information about radioactivity and its effects are explored here.
You can explore all of the characteristics of each element of the periodic table at this interactive site.
Learn how the different properties of atoms allow scientists to carry out the process of carbon dating.
2) How Do Atoms Interact to Form Molecules?
By using physical molecular models, this site presents the general features of atomic structure and bonding that are important for organisms.
This site provides an excellent tutorial about the basics of chemistry.
Visit this link to see excellent simulations of chemical bonding in action.
3) Why Is Water So Important to Life?
The series of slides at this site provides comprehensive information about the chemistry of acids and bases as well as the definition of pH.
Learn about water molecules and how they bond together. This site also provides excellent images of hydrogen bonding in water.
Animations and diagrams are used at this site to help you learn about the behavior of water molecules under different environmental conditions.