chem final

domains

macroscopic, microscopic, symbolic

mass

measure of amount of matter in an object(kg)

weight

force gravity exerts on an object (N)

law of conservation of matter

no detectable change in total quantity of matter present when matter converts from one form to another

atom

smallest particle of element that still has properties of that element

physical property

characteristic of matter not associated with change in chemical composition. ex. density, color, hardness, melting point, boiling point, electrical conductivity

physical change

change in state of properties of matter without accomapnying change in chemical identity of substances contained in matter

chemical property

ability or inability to change from one type of matter to another, characteristic only observed through chemical reaction

ex. flammability, toxicity, acidity, reactivity

chemical change

produces different types of matter from th matter present before reaction

intensive property

does not depend on the amount of matter present within a sample

ex.temp, bpt, concentration, luster, density

extensive property

depends on amnt of matter present

ex. weight, length, volume, entropy

sig figs in operations

addition/subtraction: least number of decimal places

multiplication/division: least sig figs

precision

how close your measurements are to each other

accuracy

how close your measurements are to the accepted value

subatomic particles

neutron slightly larger than proton but about the same mass, mass in nucleus which is made of protons and neutrons

A/Z

a-mass number / z-atomic number in isotope