Prelim exam - Terms to remember

Question 1

Value of mega (M)

Answer 1

1x10^6

Question 2

Value of micro (μ)

Answer 2

1x10^-6

Question 3

Value of nano (n)

Answer 3

1x10^-9

Question 4

Value of pico (p)

Answer 4

1x10^-12

Question 5

Answers the question: How much of Substance X is in the sample?

Answer 5

Quantitation

Question 6

Answers the question: Does the sample contain substance X?

Answer 6

Detection

Question 7

Answers the question: What is the identity of substance X in the sample

Answer 7

Identification

Question 8

Involves the identification of substances of interest

Answer 8

Qualitative analysis

Question 9

Determination of the concentration or amount of substances in a sample

Answer 9

Quantitative analysis

Question 10

The components of the sample that are to be determined

Answer 10

Analyte

Question 11

What are the techniques used in classical chemical analysis?

Answer 11

Volumetric

Gravimetric

Question 12

This analysis depends on the physical properties where there is no reaction involved and depends on more complex devices

Answer 12

Instrumental analysis

Question 13

Techniques used in instrumental analysis

Answer 13

Electroanalytical methods
Spectroscopic methods
Miscellaneous methods

Question 14

Enumerate the basic analytical process

Answer 14

Define the problem
Select a method
Obtain a representative sample
Prepare the sample for analysis
Perform separations
Perform measurements
Calculate and report the result

Question 15

What errors statistically measure accuracy?

Answer 15

Absolute and relative

Question 16

What statistically measures precision?

Answer 16

Standard deviation

Variance

Question 17

Error that can be determined and eliminated; what does this affect?

Answer 17

Determinate/systemic errors; affects accuracy

Question 18

Error that cannot be determined and controlled; what does this affect?

Answer 18

Indeterminate/random error; affects precision

Question 19

What lead to the outliers in measurements

Answer 19

Gross errors