Chemistry final vocab

mass

measurement that reflects amount of matter - constant and doesn’t vary place to place

matter

anything that has mass and takes up space

weight

measure for the amount of matter and effects earth’s pull has on it - varies

quantative

the quantity of something

qualative

the quality of something

scientific method

expresses numbers as a multiple of 2 factors

density

substances mass per unit of volume

volume

the amount of space it occupies

cubic cm

1 mL

accuracy

how close measured value is to accepted value

presision

how close a series of measurements are to each other

substance

matter that has uniform and unchanging composition

physical prop

charicteristics that can be observed/measure without changing composition

chemical prop

ability/inability of a substance to combine/change into one or more other substances

law of conservation of mass

states that matter is neither created nor destroyed

mixture

combination of one or more pure substances when each of them retains its individual chemical properties

percent by mass

ratio of the mass of each element to the total mass of the compound

law of definite proportions

a chemical compound always has the same and the exact same proportions by mass

percent error

difference between measured and accepted value

atom

made up of protons neutrons and electrons

subatomic particles

protons neutrons and electrons

isotope

atoms with different mass #