Glencoe Chemistry Chp. 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| accuracy | refers to how close a measured value is to an accepted value
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| 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])
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| conversion factor | is a ratio of equivalent values used to express the same quantity of different units and is always equal to 1
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| density | is a ratio that compares the mass of an object to its volume. Units of measurement are grams / cubic centimeters g/cm3
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| derived unit | a unit that is defined by a combination of base units
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| dimensional analysis | is a method of problem-solving that focuses on the units used to describe matter.
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| graph | is a visual display of data
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| kelvin | is the SI base unit of temperature. Freezes at 273 K and boils 373 K
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| kilogram | is about 2.2 pounds defined by the platinum-iridium metal cylinder
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| liter | amount of liquid in a container . V= one cubic decimeter
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| 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)
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| percent error | is the ratio of an error to an accepted value.
Percent error= error/ accepted value then times 100
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| precision | refers to how close a series of measurements are to one another
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| scientific notation | expresses numbers as a multiple of two factors: number between 1 and 10' and ten raised to a power or exponent.
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| second | the frequency of microwave radiation given off by cesium-133 atom is the physical standard used to establish length of a second
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| significant figure | include all known digits plus one estimated digit.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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