Chemistry Chapter 2 Data Analysis – Flashcards
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accuracy
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how close a measured value is to an accepted value
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base unit
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a defined unit in a system of measurement that is based on an object or event in the physical world and is independent of other unit
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conversion factor
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a ratio of equivalent values used to express the same quantity in different units; is always equal to 1 and changes the units of a quantity without changing its value
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density
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the ratio of the mass of an object to its volume
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derived unit
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a unit that is defined by a combination of base units
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dimensional analysis
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A problem solving method that focuses on the units that are used to describe matter
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graph
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a visual representation of information, such as a circle graph, line graph, or bar graph, that can reveal patterns in data
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kelvin
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SI unit for temperature
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kilogram
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the SI base unit for mass
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liter
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the metric unit for volume equal to one cubic decimeter
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meter
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SI unit of length
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percent error
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THE RATIO OF AN ERROR TO AN ACCEPTED VALUE
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precision
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refers to how close a series of measurements are to another; precise measurements show little variation over a series of trial but may not be accurate
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scientific notation
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expresses numbers as multiple of two factors- a number between 1 & 10, and raised 10 to a power, or exponent; makes it easier to handle extremely large or small measurements
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second
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SI base unit for time
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significant figure
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The number of all know digits reported in measurements plus one estimated digit
