random errors
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vary arbitrarily in both signs and magnitude between successive
measurements.
i.e. inability to control constancy of an experimental variable or may
arise from limited precision due to equipment.
,Absolute error for One measurement
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Assume +-1 in LAST DIGIT of measured value
Relative Standard Deviation RSD
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take each result, square them, add them together, divide them by the
number of trials times the number of trials-1, and square root the
answer.
What determines melting point
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polarity, large molecular surface area and high molecular symmetry
are associated with greater intermolecular forces and higher melting
point
acid (arrenhius definition)
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, produces H+ ions in aqueous solution
ppm in solution
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mg of solute per L solution
Relative Average Deviation
%RAD
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take average of data measurements
take average of range of the uncertainty in the measurements.
(initial-average)
relative average deviation = average of uncertainties/average of
measurements
Report in %
first order reaction
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Rate=k[A]^1
-directly proportional tp concentration of reactant
-slope of curve becomes less steep (slower) with time
, percent recovery of recrystallization
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=high solubility-low/high x 100%
Buffer
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resists pH change by neutralizing added acid or added base buffer
contains significant amounts of both a weak acid and its conjugate
base (or vise versa)
-must contain a significant amount of both a weak acid and its
conjugate base
accuracy
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closeness of a result to the true value(some point of reference)
Graph of Beer's Law @constant wavelength
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vary arbitrarily in both signs and magnitude between successive
measurements.
i.e. inability to control constancy of an experimental variable or may
arise from limited precision due to equipment.
,Absolute error for One measurement
Give this one a try later!
Assume +-1 in LAST DIGIT of measured value
Relative Standard Deviation RSD
Give this one a try later!
take each result, square them, add them together, divide them by the
number of trials times the number of trials-1, and square root the
answer.
What determines melting point
Give this one a try later!
polarity, large molecular surface area and high molecular symmetry
are associated with greater intermolecular forces and higher melting
point
acid (arrenhius definition)
Give this one a try later!
, produces H+ ions in aqueous solution
ppm in solution
Give this one a try later!
mg of solute per L solution
Relative Average Deviation
%RAD
Give this one a try later!
take average of data measurements
take average of range of the uncertainty in the measurements.
(initial-average)
relative average deviation = average of uncertainties/average of
measurements
Report in %
first order reaction
Give this one a try later!
Rate=k[A]^1
-directly proportional tp concentration of reactant
-slope of curve becomes less steep (slower) with time
, percent recovery of recrystallization
Give this one a try later!
=high solubility-low/high x 100%
Buffer
Give this one a try later!
resists pH change by neutralizing added acid or added base buffer
contains significant amounts of both a weak acid and its conjugate
base (or vise versa)
-must contain a significant amount of both a weak acid and its
conjugate base
accuracy
Give this one a try later!
closeness of a result to the true value(some point of reference)
Graph of Beer's Law @constant wavelength
Give this one a try later!
