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SCHS Chapter 2

Glencoe Chemistry Chp. 2

accuracy refers to how close a measured value is to an accepted value
base unit is a defined unit in a system of measurement that is based on an object or event in the physical world. (7) time (second [s]), length( meter [m]), mass (kilogram [kg]), temperature (kelvin [K]), amount of a substance (mole [mol]), electric current 9ampere{A]), luminous intensity (candela ([cd])
conversion factor is a ratio of equivalent values used to express the same quantity of different units and is always equal to 1
density is a ratio that compares the mass of an object to its volume. Units of measurement are grams / cubic centimeters g/cm3
derived unit a unit that is defined by a combination of base units
dimensional analysis is a method of problem-solving that focuses on the units used to describe matter.
graph is a visual display of data
kelvin is the SI base unit of temperature. Freezes at 273 K and boils 373 K
kilogram is about 2.2 pounds defined by the platinum-iridium metal cylinder
liter amount of liquid in a container . V= one cubic decimeter
meter the distance that light travels through a vacuum in 1 / 299,792,458 of a second approx.... 3 inches longer than a yard (39 inches)
percent error is the ratio of an error to an accepted value. Percent error= error/ accepted value then times 100
precision refers to how close a series of measurements are to one another
scientific notation expresses numbers as a multiple of two factors: number between 1 and 10' and ten raised to a power or exponent.
second the frequency of microwave radiation given off by cesium-133 atom is the physical standard used to establish length of a second
significant figure include all known digits plus one estimated digit.
Created by: gayledains