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# Chem Chap 2 Sec 3

### Using Scientific Measurements

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