| A | B |
|---|
| atom | basic unit of matter |
| nucleus | center of the atom- the "brain" |
| electron | negatively charged particle |
| element | pure substance that consists entirely of one type of atom |
| isotopes | atoms of the same elements that differ in the number of neutrons they contain |
| chemical compoud | a substance formed by the chemical combo of two or more elementsin deff. proportions |
| ionic bond | formed when one or more electrons are transferred from one atom to another |
| covalent | forms when electrons are shared between atoms |
| molecule | smallest unit of most compounds |
| cohesion | an atrraction between molecules of the same substance |
| adhesion | attraction between molecules of different substances |
| mixture | a material compound of two or more elements or compounds that are physically mized together but not chemically combined |
| solute | substance being dissolved |
| solvent | substance in which the solute dissolves |
| suspensions | mixtures of water and nondissolved material |
| buffers | weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changed in pH |
| monosaccharides | single sugar molecules |
| lipids | made mostly from carbon and hydrogen atoms: can be used to store energy-waterproof coverings |
| nucleic acids | are macromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorus- they store and transmit hereditary or genetic info |
| proteins | proteins control the rate of reactions and regulate cell processes-some are used to form bones and muscle- help fight disease |
| chemical reaction | process that changes one set of chemicals in to another set of chemicals |
| ENZYMES | proteins that act as biological catalysts- cells use enzymes to speed up chem. reactions that take place in cells |
