Analytical Chemistry ACS Final
Review Questions And Answers Rated
A+ New Update Assured Satisfaction
95% Confidence Interval - ✔️✔️(t*s.d.)/ √N
t= from table, use degrees of freedom
N= # of observations
Q test calculation - ✔️✔️gap/range
You can reject the data if Qexp>Q90
Error - ✔️✔️Difference between accepted and measured value
Precision - ✔️✔️describes the reproducability of measurements
Accuracy - ✔️✔️indicates the closeness of the measurements to the true value
absolute error - ✔️✔️(E)= X:-Xe (measurement- true)
relative error - ✔️✔️(Er)= (X:-Xe)/Xe
Random or indeterminate error - ✔️✔️causes data to be scattered around a mean
value
(affects precision)
gross error - ✔️✔️often large errors which result from human error
Systematic or determinate error - ✔️✔️causes mean to differ from the true value
instrumental error - ✔️✔️malfunctioning instruments
method errors - ✔️✔️nonideal chemical or physical behavior or analytical systems
personal errors - ✔️✔️carelessness, personal limitations, and reading scales
constant errors - ✔️✔️stay the same as the size of the measured increases
Review Questions And Answers Rated
A+ New Update Assured Satisfaction
95% Confidence Interval - ✔️✔️(t*s.d.)/ √N
t= from table, use degrees of freedom
N= # of observations
Q test calculation - ✔️✔️gap/range
You can reject the data if Qexp>Q90
Error - ✔️✔️Difference between accepted and measured value
Precision - ✔️✔️describes the reproducability of measurements
Accuracy - ✔️✔️indicates the closeness of the measurements to the true value
absolute error - ✔️✔️(E)= X:-Xe (measurement- true)
relative error - ✔️✔️(Er)= (X:-Xe)/Xe
Random or indeterminate error - ✔️✔️causes data to be scattered around a mean
value
(affects precision)
gross error - ✔️✔️often large errors which result from human error
Systematic or determinate error - ✔️✔️causes mean to differ from the true value
instrumental error - ✔️✔️malfunctioning instruments
method errors - ✔️✔️nonideal chemical or physical behavior or analytical systems
personal errors - ✔️✔️carelessness, personal limitations, and reading scales
constant errors - ✔️✔️stay the same as the size of the measured increases
