Chemicals

Question 1

“Building blocks of life”

Answer 1

CHEMICALS

Question 2

➢ Acts as an “analytical standard”
➢ It focuses on a particular substance in proportion to other substances

Answer 2

CHEMICAL PURITY

Question 3

can also refer to the absence or negligibly low concentrations of other substances

Answer 3

Purity

Question 4

________ conform to the minimum standards set forth by the Reagent
Chemical Committee of the American Chemical Society (ACS) and are used whenever
possible in analytical work. Some suppliers label their products with the maximum
limits of impurity allowed by the ACS specifications while others print actual
concentrations for the various impurities.

Answer 4

Reagent Grade

Question 5

(ACS)

Answer 5

Reagent
Chemical Committee of the American Chemical Society

Question 6

The National Institute of
Standards and Technology (NIST) is an excellent source for _______. This
agency also prepares and sells reference standards, which are complex substances that
have been exhaustively analyzed.

Answer 6

Primary-Standard Grade

Question 7

(NIST)

Answer 7

The National Institute of
Standards and Technology

Question 8

Chemicals that have been prepared for a specific application are also available.
- Included among these are solvents for spectrophotometry and high-performance liquid
chromatography. Information pertinent to the intended use is supplied with these
reagents.

Answer 8

Special-Purpose Reagent Chemicals

Question 9

[Chemical Grades] This grade is acceptable for food, drug, or medicinal use and can be
used for _____ applications or for general procedures that require stringent quality
specifications and a purity of ≥95%.

Answer 9

ACS GRADE

Question 10

[Chemical Grades] is generally equal to ACS grade (≥95%) and is acceptable for
food, drug, or medicinal use and is suitable for use in many laboratory and analytical
applications.

Answer 10

REAGENT GRADE

Question 11

[Chemical Grades] acceptable standard for many pharmaceutical-related laboratory applications. It
encompasses medicinal and first-aid products, as well as many personal care products.;
Its purity level can be as high as 99.7%.

Answer 11

USP GRADE

Question 12

[Chemical Grades] jointly publish a book of public pharmacopeial standards for
chemical and biological drug substances, dosage forms, compounded preparations,
excipients, medical devices, and dietary supplements. The listings here should be
reviewed to determine which would be considered equivalent grades.

Answer 12

NF GRADE

Question 13

[Chemical Grades] is the most popular grade for use in educational
applications, but its exact levels of impurities are unknown. While excellent for
teaching and training, it is not pure enough to be offered for food, drug, or medicinal
use of any kind.

Answer 13

LABORATORY GRADE

Question 14

[Chemical Grades] also called pure or practical grade; meets no official standard; it
is not pure enough to be offered for food, drug, or medicinal use of any kind.

Answer 14

PURIFIED GRADE

Question 15

[Chemical Grades] is used for commercial and industrial purposes; however, like
many others, it is not pure enough to be offered for food, drug, or medicinal use of any
kind.

Answer 15

TECHNICAL GRADE