Quiz 1 Lesson 2 Chem Bio

Question 1

Substances used in a chemical reaction in an analytical laboratory
has a specific applicability to a given system or procedure and must be used in sample preparation as prescribed in terms of identity and purity

Answer 1

Reagents

Question 2

A specially manufactured analytical reagent of exceptional purity for standardizing solutions and preparing reference standards.

Answer 2

Primary standard

Question 3

A reagent that meets or exceeds the specifications of purity put forth by
the American Chemical Society. The certificate of analysis is on the label.

Answer 3

ACS certified

Question 4

A reagent that meets the standards of purity established by the
manufacturer.

Answer 4

Certified reagent

Question 5

Reagents that meet the purity requirements of the U.S. Pharmacopeia (USP)
and the National Formulary (NF).

Answer 5

USP/NF

Question 6

Solvents of suitable purity for use in spectrophotometric procedures.

Answer 6

Spectro grade or spectroanalyzed

Question 7

Solvents of suitable purity
for use in liquid chromatography procedures.

Answer 7

High-performance liquid chromatography (HPLC) grade

Question 8

Chemicals of sufficiently high quality to be suitable for use in some syntheses.
Organic chemicals of practical grade may contain small amounts of intermediates,
isomers, or homologs.

Answer 8

Practical

Question 9

Chemicals of reasonable purity for applications that have no official standard
for purity.

Answer 9

Technical

Question 10

What are the 4 Hypotheses of Dalton’s Atomic Theory

Answer 10

1. Elements are composed of extremely small particles called atoms.
2. All atoms of a given element are identical, having the same size, mass, and chemical properties.
3. Compounds are composed of atoms of more than one element.
4. A chemical reaction involves only the separation, combination, or rearrangement of atoms; it does not result in their creation or destruction.

Question 11

if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in ratios of small whole numbers

Answer 11

Law of Multiple proportions

Question 12

the basic unit of an element that can enter into chemical combination

Answer 12

atom

Question 13

Discovered electrons through Cathode Ray Experiment

Answer 13

Joseph John Thomson (1897)

Question 14

Discover protons through Gold Foil Experiment

Answer 14

Ernest Rutherford (1910)

Question 15

Discover neutron bombardment of beryllium with a-particle

Answer 15

James Chadwick (1932)

Question 16

discovered a type of radiation which he termed x-ray when he was studying vacuum tubes and cathode rays

Answer 16

Wilhelm Röntgen (1895)

Question 17

defined as the relative number of atoms of the different isotopes of one chemical element. It gives the precise measurement of the atomic masses of elements.

Answer 17

Isotopic Abundance