Question | Answer |
substance | The physical matter, material |
atom | basic building block of matter, has a nucleus |
nucleus | center of atom |
proton | positive charged particles |
neutron | particles that have no charge |
electrons | negative charged particles |
element | pure substance that can not be broken down |
isotope | atoms of the same element that have different number of neutrons |
compound | substance formed when two or more different elements combine |
covalent bond | electrons are shared between atoms |
molecule | compound where atoms are held together by covalent bonds |
ion | atom that loses or gains 1 or more electrons, carries electrical charge. |
ionic bond | electrical attraction between 2 opposite charged atoms |
van der walls force | attraction between the molecules |
chemical reaction | atoms reorganize into different substances |
reactant | starting substance |
product | substance formed during the reaction |
activation energy | minimum amount of energy needed for reactants to form |
catalyst | lowers the activation energy |
enzyme | speeds up rate of chemical reaction |
substrate | reactant that binds to enzyme |
active site | where the substance binds with an enzyme |
hydrogen bond | a weak chemical bond between a negative electron and hydrogen atom |
solution | combo of solute and solvent |
solute | what dissolves in solvent |
solvent | does the dissolving |
mixture | combo of 2 or more substances that keep characteristics and properties |
polar molecule | equal distribution of charges |
macro molecule | large molecule |
polymer | large molecules composed of many similar smaller molecules linked together |
lipid | store energy, composed of fatty acids |
protein | transport things, made of amino acids |
nucleic acid | store, transmits, genetic info phospate , nitrogen base, ribose sugar |