ANACHEM QUIZ (MODULE 10)

Question 1

are quantitative methods that are based on determining the mass of a pure compound to which the analyte is chemically related.

Answer 1

gravimetry

Question 2

most common type of gravimetric method is

Answer 2

precipitation method

Question 3

gravimetry includes any analytical method in which the ultimate measurement is by

Answer 3

weight

Question 3

the simplest form to determine its volatile or non volatile components

Answer 3

drying or heating

Question 4

solution reaction between analytes and
reagents to give sparingly soluble products

Answer 4

principles of gravimetry

Question 5

filtration,
drying or ignition of precipitates

Answer 5

principles of gravimetry

Question 6

electrolytic deposition
of metals; weighing

Answer 6

principles of gravimetry

Question 7

flasks, beakers, filter funnels, pipettes,
filter crucibles, filter papers, oven, muffle furnace, chemical balance, desiccator

Answer 7

apparatus

Question 8

apparatus used for drying

Answer 8

desiccator

Question 9

requires careful and time consuming procedures with scrupulously clean
apparatus and very accurate weighing.

Answer 9

disadvantages

Question 10

provides exceedingly precise and
accurate analysis.

Answer 10

advantages

Question 11

example of advantages

Answer 11

inexpensive, determine atomic mass, little room for instrumental error

Question 12

7 steps of gravimetric analysis

Answer 12

preparation of the sample
precipitation
digestion
washing
drying
weighing
calculation

Question 13

types of gravimetric analysis

Answer 13

precipitation gravimetry
volatilization gravimetry
electro gravimetry
thermogravimetry

Question 14

the analyte is
converted to a sparingly soluble precipitate

Answer 14

precipitation gravimetry

Question 15

which are rare, react only with a single chemical species

Answer 15

specific reagents

Question 16

which are most common, react with a limited number of species

Answer 16

selective reagents

Question 17

properties of precipitate

Answer 17

easily filtered
insoluble
stable
wash free of contaminants,
have large particles

Question 18

what do you call the tiny particles are invisible to the naked eye

Answer 18

colloidal suspensions

Question 19

what is the size of colloidal suspensions

Answer 19

10-7 to 10-4 cm/in
diameter

Question 20

show no tendency to settle from solution and are difficult to filter

Answer 20

colloidal particles

Question 21

the temporary dispersion of such
particles in the liquid phase is called

Answer 21

crystalline suspension

Question 22

This particles is tend to settle spontaneously and are easily filtered

Answer 22

crystalline suspension

Question 23

is the phenomenon
where particles of colloidal dimensions
scatter visible radiation

Answer 23

tyndall effect

Question 24

is an unstable solution that contains a higher
solute concentration than a saturated
solution

Answer 24

supersaturated solutions

Question 25

is a process in
which a minimum number of
atoms, ions, or molecules join to
give a stable solid

Answer 25

nucleation

Question 26

can be hastened by
heating, by stirring, and by adding an electrolyte to the medium

Answer 26

coagolations

Question 27

are stable
because all the particles of the
colloid are either positively or negatively charged

Answer 27

colloidal suspensions

Question 28

is a process in which a substance is held on the surface of a solid

Answer 28

adsorption

Question 29

is retention of a substance within the pores of a solid

Answer 29

absorption

Question 30

drastic but effective way to minimize
the effects of adsorption

Answer 30

reprecipitation

Question 31

is the process by which a coagulated colloid reverts to its original
dispersed state.

Answer 31

peptization

Question 32

It happens when
two or more substance come together to
form a new substance

Answer 32

coprecipitation

Question 33

when substance
fall out of solution (removed)

Answer 33

post precipitation

Question 34

is a process in which a precipitate is formed
by slow generation of a precipitating reagent homogeneously throughout a solution

Answer 34

homogeneous precipitation

Question 35

the analyte is separated from other constituents of a sample by converting it to a gas known chemical composition

Answer 35

volatilization gravimetry

Question 36

The two most common
gravimetric methods based on volatilization

Answer 36

water and carbon dioxide

Question 37

is quantitatively distilled from many
materials by heating.

Answer 37

water

Question 38

the analyte is separated by deposition on an
electrode by an electrical current

Answer 38

electrogravimetry

Question 39

Thermal analysis in which changes in physical and chemical properties are measure as a function of increasing temperature or as a
function of time

Answer 39

thermogravimetry