transf de stare Flashcards

1
Q

def

A

transf de stare sunt trecerile unei subst dintr-o stare de agregare in alta

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2
Q

solidele

A

volum si forma proprie
-spatiile intermolec sunt mici si fortele interactiune sunt mari

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3
Q

lichide

A

volum propriu nu forma
spatii intermolec medii
forte intermolec mari

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4
Q

gazele

A

nici vol nici forma proprie
-spatiile intermolec mari
(mai ca la lichide)
fortele intermolec mici

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5
Q

topire. solidificare

A

cu absorbt de cald
Q=m*λt
cald abs e dp cu masa

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6
Q

λt

A

landa- cald latenta de topire

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7
Q

λ

A

cald latenta=cald absorbita de un kg de subst pt a se topi
[λ]si= 1 J/kg

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8
Q

temp de fierbere

A

temp la care are loc fierberea si e specifica fiecarei subt
e constanta (pt fiecare subst in parte)

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9
Q

evaporarea

A

vaporizarea la suprafata lichidului

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10
Q

fierberea

A

vaporizarea in toata masa lichid
are loc cu absorbtie de cald
Qp=m *λf (landa fierbere)
Qp=m *λv (landa vaporizare)

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11
Q

condensarea

A

din gazos in lichid
temp e cst pt fiecare subst
cu cedare de cald
Qc=m*λc
λf=λc
Tf=Te (Te temp de echil)

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12
Q

Te

A

temp de echil

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13
Q

sublimarea

A

solid in gazos

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14
Q

desublimare

A

gazos in solid

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