unit 5 chem prac words

Independent variable

Variable deliberately changed

Dependent variable

Dependent variable

Variable that is measured

Control variable

Variable kept constant ensure a fair test

Accuracy

How close measured value is to the true value

Precision

How close repeated measurements are to each other

Reliability

The consistency of results, improved by repeating measurements and calculating the mean

Resolution

Smallest change in quantity that can be measured by an instrument

Uncertainty

The range of values within the true value is expected to lie

Fair test

Test only the independent variable is changed and all the other variables controlled

Systematic error

An error causes all results to be consistently higher or lower than the true value

Random error

An error that causes variation in results due to unpredictable fluctuations

Titre

Volume of solution delivered from burette

End point

Point at which the indicator changes colour

Concordant results

Titre values within 0.2

Repeatability

Ability to obtain similar results when experiment repeated under the same conditions

Reproducibility

Ability to obtain similar results from different people / different equipment