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Wk 3 Vocab
OBHS Biology
Question | Answer |
---|---|
Element | substance consisting entirely of one type of atom (Ex: oxygen) |
Isotope | atom of an element that has a number of neutrons different from that of other atoms of the same element (Ex: Carbon 14) |
ionic bond | bond formed when one or more electrons are transferred from one atom to another (Ex: NaCl) |
covalent bond | bond formed by the sharing of electrons between atoms. (Ex: H20) |
Molecule | smallest unit of most compounds |
Buffer | weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH |
activation energy | energy needed to get a reaction started |
enzyme | protein that acts as a biological catalyst |
cohesion | attraction between molecules of the same substance |
adhesion | attraction between molecules of different substances; in plants, attraction between unlike molecules |
ion | atom that has a positive or negative charge |
pH scale | measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14 |