chem 2.0

dimensional analysis

technique using conversion factors to represent measurements

density

ratio of mass to volume

derived units

a unit that results from a combination of SI units

accuracy

a measure of how close a data point is to the true/accepted value

accepted/theoretical value

measurement that is true

precision

how close the data points are to each other

law of conservation mass

matter cannot be created destroyed only rearranged

law of definite proportions

a given chemical compound always contains the same elements in the same ration

subatomic particles

particles that make up an atom

atomic numbers

identifies the element and tells us the number of protons

protons are? (charge)

postivie

neutrons are? (charge)

neutral

electrons are? (charge)

negative charge