Quantitative Chemical Analysis Exam Questions Answered Correctly (Graded A+)
Branch of analytical chemistry that deals with determination of an unknown chemical species in a
sample - Answers Qualitative analysis
Which branch of analytical chemistry deals with the determination of the amount of the unknown
chemical species in a sample - Answers Quantitative analysis
What are the SI units? - 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: -
Answers Molality
Avogadro's number represents the number of particles present in this amount of a
substance - Answers 1 mole- expressed 6.022×1023 mol-1
The average of this type of error is zero - Answers Random error
This type of error cannot be eliminated - 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 - Answers Gross error
Statistical methods are applied to improve data containing only this type of error - Answers Random
,Faulty calibration of an analytical instrument will cause this type of error: - Answers Systematic error
The variance of a sample is represented by this symbol - Answers s^2
A symmetrical bell-shaped curve represents this type of distribution: - Answers Gaussian
The maximum of the Gaussian distribution curve corresponds to this parameter of the
sample presented on the x-axis - Answers Mean
In Gaussian distribution, 95% of the data points are located within this span around the
true value - Answers ±2sigma
In order for experimental data to be meaningful, it must be accompanied by this
information - Answers Error involved
In replicate measurements, the closeness of the mean to the true value is represented by
this term - Answers Accuracy
Systematic error affects this in experimental measurements - Answers Accuracy
The true value of a population is estimated by this parameter - Answers confidence interval
This parameter is not a measure of precision: - 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 - 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 - Answers Mean
In order to compare two means, one should perform this type of significance test: - Answers t-Test
In order to compare two variances, one should perform this type of significance test: - 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 - Answers Reject
When a null hypothesis is accepted, it signifies that the observed difference between the
, compared values is due to this - Answers Random variation
Which term describes the minimum detectable concentration of an
analytical method: - Answers Detection limit
An analysis involves several steps and operations which depend on: - Answers 1- Problem
2- Expertise
3- Apparatus
General steps in Chemical Analysis - Answers 1- Formulate question
2- Select method
3- Sampling
4- Sample preparation
5- Analysis
6- Interpretation
7- Conclusion
Yotta - Answers 10^24
Zetta - Answers 10^21
Exa - Answers 10^18
Peta - Answers 10^15
Tera - Answers 10^12
Giga - Answers 10^9
Mega - Answers 10^6
Kilo - Answers 10^3
Hecto - Answers 10^2
Deca - Answers 10^1
Deci - Answers 10^-1
Centi - Answers 10^-2
Branch of analytical chemistry that deals with determination of an unknown chemical species in a
sample - Answers Qualitative analysis
Which branch of analytical chemistry deals with the determination of the amount of the unknown
chemical species in a sample - Answers Quantitative analysis
What are the SI units? - 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: -
Answers Molality
Avogadro's number represents the number of particles present in this amount of a
substance - Answers 1 mole- expressed 6.022×1023 mol-1
The average of this type of error is zero - Answers Random error
This type of error cannot be eliminated - 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 - Answers Gross error
Statistical methods are applied to improve data containing only this type of error - Answers Random
,Faulty calibration of an analytical instrument will cause this type of error: - Answers Systematic error
The variance of a sample is represented by this symbol - Answers s^2
A symmetrical bell-shaped curve represents this type of distribution: - Answers Gaussian
The maximum of the Gaussian distribution curve corresponds to this parameter of the
sample presented on the x-axis - Answers Mean
In Gaussian distribution, 95% of the data points are located within this span around the
true value - Answers ±2sigma
In order for experimental data to be meaningful, it must be accompanied by this
information - Answers Error involved
In replicate measurements, the closeness of the mean to the true value is represented by
this term - Answers Accuracy
Systematic error affects this in experimental measurements - Answers Accuracy
The true value of a population is estimated by this parameter - Answers confidence interval
This parameter is not a measure of precision: - 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 - 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 - Answers Mean
In order to compare two means, one should perform this type of significance test: - Answers t-Test
In order to compare two variances, one should perform this type of significance test: - 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 - Answers Reject
When a null hypothesis is accepted, it signifies that the observed difference between the
, compared values is due to this - Answers Random variation
Which term describes the minimum detectable concentration of an
analytical method: - Answers Detection limit
An analysis involves several steps and operations which depend on: - Answers 1- Problem
2- Expertise
3- Apparatus
General steps in Chemical Analysis - Answers 1- Formulate question
2- Select method
3- Sampling
4- Sample preparation
5- Analysis
6- Interpretation
7- Conclusion
Yotta - Answers 10^24
Zetta - Answers 10^21
Exa - Answers 10^18
Peta - Answers 10^15
Tera - Answers 10^12
Giga - Answers 10^9
Mega - Answers 10^6
Kilo - Answers 10^3
Hecto - Answers 10^2
Deca - Answers 10^1
Deci - Answers 10^-1
Centi - Answers 10^-2
