15 terms

Chemistry chapter 3 test

STUDY
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a quantity that has both a number and a unit
measurement
a measure of how close a measurement comes to the actual value of whatever was measured
accuracy
the correct value based on reliable references
accepted value
the value measured in the lab
experimental value
experimental value minus the accepted value
how do you find error
absolute value of error divided by the accepted value multiplied by 100 percent
how do you find the percent of error
all digits that are known plus a last digit that is estimated
significant figures
International System of Unites
SI
meter, kilogram, kelvin, the second, the mole
what are the five units commonly used by chemists
meter
what measures length
liter
what measures volume
kilogram
what measures mass
a force that measures the pull of a given mass by gravity
weight
kelvin and celsius
what measures temperature
calorie
what is energy measured by