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ANACHEM > ANACHEM QUIZ (MODULE 10) > Flashcards

ANACHEM QUIZ (MODULE 10) Flashcards

1
Q

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

A

gravimetry

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2
Q

most common type of gravimetric method is

A

precipitation method

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3
Q

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

A

weight

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3
Q

the simplest form to determine its volatile or non volatile components

A

drying or heating

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4
Q

solution reaction between analytes and
reagents to give sparingly soluble products

A

principles of gravimetry

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5
Q

filtration,
drying or ignition of precipitates

A

principles of gravimetry

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6
Q

electrolytic deposition
of metals; weighing

A

principles of gravimetry

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7
Q

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

A

apparatus

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8
Q

apparatus used for drying

A

desiccator

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9
Q

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

A

disadvantages

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10
Q

provides exceedingly precise and
accurate analysis.

A

advantages

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11
Q

example of advantages

A

inexpensive, determine atomic mass, little room for instrumental error

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12
Q

7 steps of gravimetric analysis

A

preparation of the sample
precipitation
digestion
washing
drying
weighing
calculation

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13
Q

types of gravimetric analysis

A

precipitation gravimetry
volatilization gravimetry
electro gravimetry
thermogravimetry

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14
Q

the analyte is
converted to a sparingly soluble precipitate

A

precipitation gravimetry

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15
Q

which are rare, react only with a single chemical species

A

specific reagents

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16
Q

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

A

selective reagents

17
Q

properties of precipitate

A

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

18
Q

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

A

colloidal suspensions

19
Q

what is the size of colloidal suspensions

A

10-7 to 10-4 cm/in
diameter

20
Q

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

A

colloidal particles

21
Q

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

A

crystalline suspension

22
Q

This particles is tend to settle spontaneously and are easily filtered

A

crystalline suspension

23
Q

is the phenomenon
where particles of colloidal dimensions
scatter visible radiation

A

tyndall effect

24
Q

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

A

supersaturated solutions

25
Q

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

A

nucleation

26
Q

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

A

coagolations

27
Q

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

A

colloidal suspensions

28
Q

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

A

adsorption

29
Q

is retention of a substance within the pores of a solid

A

absorption

30
Q

drastic but effective way to minimize
the effects of adsorption

A

reprecipitation

31
Q

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

A

peptization

32
Q

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

A

coprecipitation

33
Q

when substance
fall out of solution (removed)

A

post precipitation

34
Q

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

A

homogeneous precipitation

35
Q

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

A

volatilization gravimetry

36
Q

The two most common
gravimetric methods based on volatilization

A

water and carbon dioxide

37
Q

is quantitatively distilled from many
materials by heating.

A

water

38
Q

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

A

electrogravimetry

39
Q

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

A

thermogravimetry

ANACHEM (6 decks)

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