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BJ Chem Ch 3 Measure
BJ Chapter 3 Measuring and Calculatin
| Question | Answer |
|---|---|
| The act of comparing an unknown quantity to a standard unit. | measurement |
| A property such as length, mass, volume, time and electrical charge. | dimension |
| One of something | unit |
| Dimensional units are lined up on it to provide a means of measuring. | scale |
| Act of accurately subdividing into measurement units. | calibrate |
| An articial device made for the purpose of refining, extending, or substituting for the human senses. | instrument |
| From the French Système international standard system of metric measurement | SI |
| Seven things each of which measures a foundational dimension in the SI system | base unit |
| 22 things approved for use in the SI brought about by a combination of the base units. | derived unit |
| Multiplying the measurement by a conversion factor. | unit conversion |
| A fraction that contains both the original unit and its equivalent value in a new unit. | conversion factor |
| how close the measured value is to the actual or accepted value of the dimension measured. | accuracy |
| Compares the magnitude of the measurement error with the size of the measurement. | percent error |
| how repeatable a measurement is. | precision |
| An instrument that displays the answer against a scale. | analog instrument |
| An instrument that displays just the answer without comparison to a scale. | digital instrument |
| Plural of datum- measurement gathered from instruments or recorded observations | data |
| Digits known for certain plus one more. | significant digit (SD) |
| The relationship of mass to volume. | density |
| A system in which different-sized units are related to each other by multiples of 10. | metric |
| length | l-meter |
| mass | m-kiilogram |
| time | t-second |
| temperature (absolute) | T-Kelvin |
| number of particles | n-mole |
| electrical current | l-amphere |
| mega | M-million |
| kilo | k-thousand |
| deci | d-tenth |
| centi | c-hundredth |
| milli | m-thousandth |
| micro | u-millionth |
| nano | n-billionth |
| Stringing together conversion factors to avoid errors. | bridge notation |
| (T or F)All nonzero digits are significant. | T |
| (T or F) If a decimal point is not present, no trailing zeros are significant. | T |
Created by:
MArCHChemBJ
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