A compound is a molecule made of at least two different atoms. Bonds can be covalent or ionic. Cl becomes Cl- when it gains one. These types of bonds are typically found in inorganic compounds. There are many important ions in the human body.
Covalent reactions occur when atoms share electrons in o rder to fill an orbital.
They are typically found in organic compounds. Cohesive water molecules dissolve polar substances and provide excellent liquid transport of nutrients and wastes. This insulates aquatic organisms from dramatic temperature changes. Over pH 7 is basic. Buffers These are chemicals, or mixtures of chemicals that keep pH steady by absorbing extra H or OH molecules.