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Chem Chap 2 Sec 3
Using Scientific Measurements
| Question | Answer |
|---|---|
| The closeness of measurements to the correct or accepted value of the quantity measured | Accuracy |
| The closeness of a set of measurements of the same quantity made in the same way | Precision |
| Calculated by subracting teh accepted value from teh experimental value, dividing the diference by the accepted value & then multiply by 100 | Percentage error |
| When does the percentage error have a negative value | if the accepted value is greater than the experimental value |
| When does the percentage error have a positive value | If the accepted value is less than the experimental value |
| Consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated | Significant figures |
| The significance of zeros iin a number depens on | their location |
| Significant or not: Zeros appearing between nonzero digits | Significant |
| Significant or not; Zeros appearing in front of all nonzero digits | Not significant |
| Significant or not: Zeros at the end of a number and to the right of a decimal point | significant |
| Significant or not: Zeros at the end of a number but to the left of a decimal point | May or may not be significant |
| Rules to rounding: Digit after the last digit to be retained is greater than 5 | imcrease by 1 |
| Rules to rounding: Digit after teh last digit to be retained is less than 5 | stay the same |
| rules to rounding: Digit after the last digit to be retained is 5 followed by nonzero | increase by 1 |
| rules to rounding: Digit after the last digit to be retained is 5 not followed by nonzeros an preceeded by an odd number | increase by 1 |
| rules to rounding: Digit after the last digit to be retained is 5 not followed by nonzeros an preceeding significant digit is even | Staty the same |
Created by:
tbstinso
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