Quantitative Chemical
Analysis
,Branch of analytical chemistry that deals with determination of an unknown chemical
species in a sample - CORRECT ANSWERS-Qualitative analysis
Which branch of analytical chemistry deals with the determination of the amount of the
unknown chemical species in a sample - CORRECT ANSWERS-Quantitative analysis
What are the SI units? - CORRECT ANSWERS-Length- Meter
Mass- Kilogram
Time- Second
Temperature- Kelvin
Amount of Substance- Mole
Electric Current- Ampere
Luminous intensity- Candela
Plane angle- Radian
Solid angle- Steradian
Frequency- Hz
Force- N
In physico-chemical experiments (in which temperature as well as the volume of the
system may change), the most appropriate way of expressing concentration is through
this unit: - CORRECT ANSWERS-Molality
Avogadro's number represents the number of particles present in this amount of a
substance - CORRECT ANSWERS-1 mole- expressed 6.022×1023 mol-1
The average of this type of error is zero - CORRECT ANSWERS-Random error
This type of error cannot be eliminated - CORRECT ANSWERS-Random error
A laboratory protocol requires a reaction to be carried out using methanol as the
solvent.
A careless technician performed this reaction using hexane as the solvent. In this
instance, this type of
error has occurred - CORRECT ANSWERS-Gross error
Statistical methods are applied to improve data containing only this type of error -
CORRECT ANSWERS-Random
Faulty calibration of an analytical instrument will cause this type of error: - CORRECT
ANSWERS-Systematic error
The variance of a sample is represented by this symbol - CORRECT ANSWERS-s^2
A symmetrical bell-shaped curve represents this type of distribution: - CORRECT
ANSWERS-Gaussian
, The maximum of the Gaussian distribution curve corresponds to this parameter of the
sample presented on the x-axis - CORRECT ANSWERS-Mean
In Gaussian distribution, 95% of the data points are located within this span around the
true value - CORRECT ANSWERS-±2sigma
In order for experimental data to be meaningful, it must be accompanied by this
information - CORRECT ANSWERS-Error involved
In replicate measurements, the closeness of the mean to the true value is represented
by
this term - CORRECT ANSWERS-Accuracy
Systematic error affects this in experimental measurements - CORRECT ANSWERS-
Accuracy
The true value of a population is estimated by this parameter - CORRECT ANSWERS-
confidence interval
This parameter is not a measure of precision: - CORRECT ANSWERS-Mean
A clinical technician has determined the concentration of thiol in blood of a rheumatoid
arthritis patient in replicate measurements with the following results (in mM): 2.81, 4.06,
3.62, 3.56,
3.27, 3.46, and 3.76. The technician will have this many degrees of freedom in
determining the
variance of these measurements - CORRECT ANSWERS-Six ( n-1)
The confidence interval shows a range of values that includes this parameter of the
population with an ascribed degree of confidence - CORRECT ANSWERS-Mean
In order to compare two means, one should perform this type of significance test: -
CORRECT ANSWERS-t-Test
In order to compare two variances, one should perform this type of significance test: -
CORRECT ANSWERS-F-Test
In a significance test, if the calculated value of the test parameter exceeds its critical
value, then one should do this with the null hypothesis - CORRECT ANSWERS-Reject
When a null hypothesis is accepted, it signifies that the observed difference between
the
compared values is due to this - CORRECT ANSWERS-Random variation
Which term describes the minimum detectable concentration of an
analytical method: - CORRECT ANSWERS-Detection limit
Analysis
,Branch of analytical chemistry that deals with determination of an unknown chemical
species in a sample - CORRECT ANSWERS-Qualitative analysis
Which branch of analytical chemistry deals with the determination of the amount of the
unknown chemical species in a sample - CORRECT ANSWERS-Quantitative analysis
What are the SI units? - CORRECT ANSWERS-Length- Meter
Mass- Kilogram
Time- Second
Temperature- Kelvin
Amount of Substance- Mole
Electric Current- Ampere
Luminous intensity- Candela
Plane angle- Radian
Solid angle- Steradian
Frequency- Hz
Force- N
In physico-chemical experiments (in which temperature as well as the volume of the
system may change), the most appropriate way of expressing concentration is through
this unit: - CORRECT ANSWERS-Molality
Avogadro's number represents the number of particles present in this amount of a
substance - CORRECT ANSWERS-1 mole- expressed 6.022×1023 mol-1
The average of this type of error is zero - CORRECT ANSWERS-Random error
This type of error cannot be eliminated - CORRECT ANSWERS-Random error
A laboratory protocol requires a reaction to be carried out using methanol as the
solvent.
A careless technician performed this reaction using hexane as the solvent. In this
instance, this type of
error has occurred - CORRECT ANSWERS-Gross error
Statistical methods are applied to improve data containing only this type of error -
CORRECT ANSWERS-Random
Faulty calibration of an analytical instrument will cause this type of error: - CORRECT
ANSWERS-Systematic error
The variance of a sample is represented by this symbol - CORRECT ANSWERS-s^2
A symmetrical bell-shaped curve represents this type of distribution: - CORRECT
ANSWERS-Gaussian
, The maximum of the Gaussian distribution curve corresponds to this parameter of the
sample presented on the x-axis - CORRECT ANSWERS-Mean
In Gaussian distribution, 95% of the data points are located within this span around the
true value - CORRECT ANSWERS-±2sigma
In order for experimental data to be meaningful, it must be accompanied by this
information - CORRECT ANSWERS-Error involved
In replicate measurements, the closeness of the mean to the true value is represented
by
this term - CORRECT ANSWERS-Accuracy
Systematic error affects this in experimental measurements - CORRECT ANSWERS-
Accuracy
The true value of a population is estimated by this parameter - CORRECT ANSWERS-
confidence interval
This parameter is not a measure of precision: - CORRECT ANSWERS-Mean
A clinical technician has determined the concentration of thiol in blood of a rheumatoid
arthritis patient in replicate measurements with the following results (in mM): 2.81, 4.06,
3.62, 3.56,
3.27, 3.46, and 3.76. The technician will have this many degrees of freedom in
determining the
variance of these measurements - CORRECT ANSWERS-Six ( n-1)
The confidence interval shows a range of values that includes this parameter of the
population with an ascribed degree of confidence - CORRECT ANSWERS-Mean
In order to compare two means, one should perform this type of significance test: -
CORRECT ANSWERS-t-Test
In order to compare two variances, one should perform this type of significance test: -
CORRECT ANSWERS-F-Test
In a significance test, if the calculated value of the test parameter exceeds its critical
value, then one should do this with the null hypothesis - CORRECT ANSWERS-Reject
When a null hypothesis is accepted, it signifies that the observed difference between
the
compared values is due to this - CORRECT ANSWERS-Random variation
Which term describes the minimum detectable concentration of an
analytical method: - CORRECT ANSWERS-Detection limit
