| A | B |
|---|
| boiling point | the temp. @which the vaper pressure of a liquid is just equal to the extermal pressure on the liquid |
| coefficient | a small whole number that appeaes in front of a formula in a balanced chemical equation |
| atomic mass | the weighted average of the masses of the isotopes of an element |
| flammability | ------------------- |
| chemical reaction | the changing of suvstances to other substances by the breaking of old bonds and the formation of new bonds |
| compound | a substance that can be separated into simpler suvstances only by chemical reactions |
| experiment | a carefully controlled, repeatable procedure for gathering data to test a hypothesis |
| homogeneous | a mixture that is completely uniform in comprosition; its components are not distinguishable |
| liquid | a form of matter that flows, has a fixvolume and takes the shape of its container |
| matter | anything that takes up soace and has mass |
| phase | any part of a system with uniform composition and properties |
| physical chemistry | the study of the theoretical basis of chemical behavior relying on mathematics and physics |
| reactant | a starting substance in a chemical reaction |
| solid | matter which has a definite shape and volume |
| theory | a thoroughly tested model that explains why experiments give certain results |
| soluble | ------------------------ |
| pure substance | ----------------------------- |
| precision | the reproducibility under the same conditiona of a measurement |
| electron | a megatively charged subatomic particle |
| proton | a positively chared subatimic particle found in the nucleus of an atom |
| neutron | a subatomic particle with no charge and a mass of one amu found in the nucleaus of the atom |
| isotope | atoms of the same element that have the same atomic # but different atomic massess due to a different #of neurtons |
| criss-cross | ---------------------------- |
| 22.4 liter | ---------------------- |
| law of constant composition | ------------------------------- |
| law of conservation of mass | mass canbee neither created nor destroyed in an ordinary chemical or physical process |
| anoin | any atom or group of atoms with a negative charge (right side) |
| cation | any atom or group of atoms w/ a positive charge (left side) |
| octet | eight electrons in the highest occupied orbital of noble gases |
| Democritus | ---------------------------------- |
| sublimation | the conversion of a solid to a gas without passing throught the liquid state |
| prefixes | ------------------------------------ |
| transition metal | an element found in one or the Bgroups of the periodic table |
| biochemistry | the study of the composition and changes in composition of libing organismes |
| chemical symbol | a one or two letter representation of an element |
| halogen | any member of the nonmetallic elements in Group 7A of the periodic table |
| gas | matter that has no definite shape or volume; it adopts the shape and bolume of its container |
| hypothesis | a descriptibe model used to explain observaions |
| mass | the amount of matter than an object contains; the SI base unit of mass is the kilogram(amu) |
| mixture | a combinaion of 2 or more substances that are not chemically combined |
| energy | the capacity for doing work; it exisits in several forms including chemical, nuclear, electrical, radiant, mechaniscal, and thermal energies |
| Phisical property | a quality of a substance that can be observed or measured without changing the substance's chemical composition |
| scientific law | a concise statement that summarizes the results of a broad variety of observations and experiments |
| solution | a homogeneous mixture |
| vapor | a substance in the gaseous state that is ordinarly a liquid or solid |
| density | the ratio of the massof an object its volume |
| conclusion | ----------------------------------- |
| validity | ------------------------------------ |
| hydroxide ion | the megative ion formed when a water moleculeloses a hydrogen ion |
| atomic # | the number of protons in the nucleaus of an atom of an element |
| synthesis | --------------------------- |
| double replacement | ---------------------------------- |
| heat | (triangle symbol) |
| crystalline | ---------------------------- |
| accuracy | the closeness of a measurment to the true value of what is being measured |
| control | ------------------------------------ |
| chemistry | the srudy of the structure, properties, and composition of suvstances and the changes that suvstances undergo |
| element | a suvstance that caammot ve changed into a simpler substance |
| heterogeneous | a mixture that is not uniform in composition; its components are readily distinguished |
| inorganic chemistry | the study of substances that do not contain carbon |
| plasma | a state of matter consisting of a gaseous mixture of electrons and positive ions |
| organic chemisty | the study of compounds that contain the element carbon |
| physical change | an alteration of a substance that ddoes not affect its chemical composition |
| product | a suvstance formed in a chemical reaction |
| scientific method | ---------------- |
| charge | -------------- |
| filter | ------ |
| decomposion | --------- |
| combustion | ---------------- |
| noble gases | any member of a group of gaseous elements in group ) of the periodic table' |
| alkali earth metals | any metal in group 2A of the periodic table |
| % composition | the %by mass of each element in a compound |
| molar mass | an expression sometimes used in place of gram formula mass to refer to the mass of a male of any element or compound |
| mole | the amount of a substance that comtains 6.02 x 10 to the 23rd representstice particles of that substance ; a gran formula mass of any substance |
| subscript///yields | -------------------- |
| thompson | puding l theory |
| LD50 | -------------- |
| OSHA | ------------------ |
| covalent | ------------ |
| Dalton | ------------------- |
