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Chem Ch. 1 & 11
chemistry and stuff
11
Chemistry
11th Grade
09/10/2012

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Cards

Term
Significant Figures
Definition
The digits in the measurement up to and including the first unncertain digit.
Term
Experimental Error
Definition
The difference between the recorded value and the generally accepted or literature value.
Term
Random Errors
Definition
This is when an experimenter approximates a reading and there is an equal probability of being too high or too low. 
Term
Repeatable Results
Definition
If the same person duplicates an experiment with the same results
Term
Reproducible Results
Definition
If several experimenters duplicate the results of an experiment
Term
Systematic Errors
Definition
These occur as a result of poor experimental design or procedure.
Term
Accuracy
Definition
The smaller the systematic error, the greater the accuracy is. Accurate measurements have small systematic errors and give a result close to the accepted value.
Term
Precision
Definition
The smaller the random uncertainties, the greater the precision is. Precise measurements have small random errors and are reproducible in repeated trials.
Term
Percentage Uncertainty
Definition
(absolute uncertainty/measured value) X 100%
Term
Fractional Uncertainty
Definition
absolute uncertainty/measured value
Term
Percentage error
Definition

It is a measure of how close the experimental value is to the literature or accepted value.

(accepted value-experimental value/accepted value) x 100%

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