Over the weekend leading us to this week we were assigned to read chapter 2 of our AP Biology textbooks and complete a worksheet on it. The reading mainly talked about traits of water, the difference between potential and kinetic energy, the definition of matter, the difference between a covalent a ionic a Van der Waals interaction and a hydrogen bond, compounds, and molecules. These apply to Big Ideas 4.A, 2.B, and 2.C. After completing the packet I still am a little confused with molar mass.
In class, we learned about carbohydrates, nucleic acids, proteins, and lipids. Lips make up cell membranes and give us energy. Nucleic Acids make up DNA and RNA. Proteins are made up of amino acids and they provide structure. Carbohydrates are made up of sugars and they also provide energy. Right now, I would say I am the most uncertain about proteins, and the most sure about amino acids.
Starting from the upper left: nucleic acids, lipids, carbohydrates and proteins.
Vocabulary from Chapter 2:
dynamic equilibrium: concentrations of reactants and products have stabilized in a given chemical reaction
electronegativity: the energy of attraction of one element on another element’s valence electron
van der Waals interaction: a weak bond between on positive region of one molecule or compound to another molecule or compound’s negative region
cohesion: hydrogen bonding holding water molecules together
adhesion: one substance holding onto another
In class we also learned about acids, bases, and pH (2.B). Acids have a lower pH level than water, whose pH is 7, meaning more H+ ions. Strong acids completely dissociate in water. Bases have a higher pH level than acids and water. Because bases have a higher pH, this means they have less H+ ions. Strong bases also dissociate in water.