Every Chemistry that you need to know for AP Biology (in 14 minutes or less)

Introduction to Matter and Elements00:00:29

Living organisms are composed of matter, which consists of essential elements like carbon, hydrogen, oxygen, and nitrogen. Elements are defined by unique atoms, the smallest units of matter, which contain protons, neutrons, and electrons.

Atomic Structure and Isotopes00:03:13

Atoms consist of a nucleus of protons and neutrons surrounded by an electron cloud. While all atoms of an element have the same number of protons (atomic number), isotopes occur when the number of neutrons varies, sometimes resulting in radioactivity.

Chemical Bonds and Electronegativity00:05:22

Chemical behavior is determined by valence electrons. Atoms bond to fill their valence shells through ionic bonds (electron transfer) or covalent bonds (electron sharing). Electronegativity determines whether covalent bonds are polar or nonpolar.

Molecular Interactions and Reactions00:10:17

Beyond primary bonds, hydrogen bonds and Van der Waals interactions stabilize molecules. Chemical reactions rearrange matter by breaking and forming bonds between reactants to create products, eventually reaching a state of chemical equilibrium.