LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
-*I./)SID'D -*I./)SID'D *'CI*'L &' &') D/ S'* &')CS F'C-L+'D D/ I*G/*I/)' I*D-S+)I'L
Práctica Nº 9: CAMBIOS DE FASE DE LA NAFTALINA ASIGNATURA: Laboratorio de Física II FECHA DE REALIZACIÓN DE LA PRÁCTICA: 10 de junio INTEGRANTES: Sandra Lissette Cuadros Gómez
15170230
Diana C!"ez Gómez
1517007#
Gue"ara $era%ta $era%ta &arco 'ntonio
151700(5
&artínez )i"eros *oemí +a%ía 151702,0 INFORME DE LABORATORIO
–
FISICA II
1
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
Gonza%es Gusm!n Lizdi imena 151700(,
INTRODUC /n e% 4resente inorme se describe 6 ana%iza %a e4eriencia %%e"ada a cabo en e% %aboratorio8 cambios de ase de %a nata%ina8 este ue e% cambio de so%ido a %í9uido :usión; 6 de %í9u %í9uid ido o a so so%i %ido do :so% :so%id idi< i Las transiciones entre %as ases só%idas8 %í9uidas 6 =aseosas8 sue%en inc%uir =randes cantidades de ener=ía> /n e% caso de %a nata%ina ue sometida a una absorción de ca%or mediante %a co coci cini ni%% %%a a e%?c e%?ctr tric ica a de %abo %abora rato tori rio o es este te ar! ar! 4osi 4osib% b%e e e% cambio de ase8 en cuanto %a nata%ina se a%%a undido a%canzar! una tem4eratura constante así mismo cuando %a nata%ina se so%idi
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
OBETI!OS
/ncontrar en 9ue instante se rea%iza e% 4roceso 4roceso de usión 6 so%idi
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
E#UIPO " MATERIALE S " E#UIPOS So4orte uni"ersa%
IMAGEN
MATERIALE S " E#UIPOS Cronometro
/9ui4o de ca%entamiento
+ubo de +ubo 4rueba
+ermómetr + ermómetro o
*ata%ina
IMAGEN
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
.aso 4ire
'=ua
$a4e% mi%imetrado
'=itador de "idrio
F$%&t%: E'a()raci*& +r)+ia
MARCO Ca,(i)- .% /a-%
Se denomina cambio de estado a %a e"o%ución de %a ma mate teri ria a entr entre e "ari "arios os es esta tado doss de a=r a=re=ac e=ació ión n sin sin 9ue 9ue ocurra un cambio en su com4osición> Los tres estados m!s estudiados estudiados 6 comunes comunes en %a tierra tierra son e% só%i só%ido8 do8 e% %í9uido %í9uido 6 e% =ase =aseos oso@ o@ no obst obstan ante te88 e% es esta tado do de a=r a=re=ac e=ació ión n m! m!ss comAn en nuestro uni"erso es e% 4%asma8 materia% de% 9ue est!n com4uestas com4uestas %as estre%%as estre%%as :si descartamos descartamos %a materia materia oscura;> •
•
•
•
La usión es e% cambio de estado de só%ido a %í9uido> $or e% contra contrario rio %a so% so%id idi La "a4orización es e% cambio de estado de %í9uido a =as> Contra Cont rari riam amen ente te %a %icu %icuac ació ión n o co cond nden ensa saci ción ón es cambio in"erso8 de =as a %í9uido>
e%
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LABORATORIO 09:
•
•
•
CAMBIOS DE FASE DE LA NAFTALINA
/% cambio cambio in"ers in"erso o re recib cibe e e% nombr nombre e de sub%im sub%imaci ación ón re=resi"a re=resi"a o crista%ización> La ioniz nizació ción es e% cambio de estado de un =as a 4%asma> /n caso contrario8 se %e %%ama deionización
F$-i*&
La usión usión es un 4roceso 4roceso ísico ísico 9ue consiste consiste en e% cambio cambio de estado de %a materia de% estado só%ido a% estado %í9uido 4or %a ac acci ción ón de% ca ca%o %orr> Cuan Cuando do se ca ca%%ie ient nta a un só% ó%iido8 do8 se trans /% 4roceso de usión es e% mismo 9ue e% de undición8 4ero este t?rmino t?rmino se a4%ica a4%ica =enera%ment =enera%mente e a sustancias sustancias como %os meta%es8 9ue se %icuan a a%tas tem4eraturas8 6 a só%idos
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
absorbido 4or %a sustancia durante su transormación8 6 no 4roduce "ariación de su tem4eratura> /ste ca%or adiciona% se conoce como ca%or de usión> /% t?rmino usión se a4%ica tambi?n a% 4roceso de ca%entar una mezc%a de só%idos 4ara obtener una diso%ución %í9uida sim4%e8 como en e% caso de %as a%eaciones>
S)'i.i0caci*& La so so%i %id di /s e% 4roceso in"erso a %a usión> /n =ene =enera ra%8 %8 %os co com4 m4ue uest stos os dism dismin inu6 u6en en de "o%u "o%ume men n a% so%idi
P$&t)- .% /$-i*& 1 -)'i.i0caci*& Los 4untos de usión 6 so%idi
P$&t)- .% /$-i*& .% a'2$&a- -$-ta&cia-
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
PROCEDIMI MONTAE 3 1> Co%o9ue %a nata%ina 6 un termómetro8 9ue 9ue e"en e"entu tua% a%me ment nte e 4ued 4ueda a se ser" r"ir ir co como mo a=itador :a=ite con cuidado;8 dentro de% tubo de 4rueba> 2> .ierta ,00 m% de a=ua a% 4ire> 3> Co%o9ue en e% tubo de ensa6o %a nata nata%i %ina na 6 e% term termóm ómet etro ro>> Sume Sumerj rja a e% tubo de ensa6o en e% "aso de 4reci4itado> ,> Co%o9ue un termómetro adiciona% en e% a=ua a=ua 4ara 4ara moni monito torrea earr su tem4 tem4er erat atur ura a como se muestra en %a <=ura * 1> 5> Ca%iente e% a=ua 6 re=istre %os "a%ores de %a tem4eratura de% tubo de ensa6o cada 30 se=undos asta 9ue %a nata%ina se und unda a 6 %ue= ue=o d?j ?je% e%a a enr enriiar ast asta a 9ue so so%i %id di<9 i<9ue :)e=istre :)e=istre %a tem4eratura durante todo e% 4roceso;> t6,i&7 8 38 3
T%,+%rat$ra i&icia' : 43 5C +:C; t:min; +:C; 21># B>5 3#>7 22 7>0 ,1 22 # 75 ,3
t:min; 12>5 13>0 13 5
+:C; BB>17 B( 71 5
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LABORATORIO 09:
T%,+%rat$ra
CAMBIOS DE FASE DE LA NAFTALINA
fusión = 79.9°C
Ta('a N 5 4 : > .% %rr)r T%,+%rat$ra .% T%,+%rat$ra .% /$-i*& /$-i*& t%*rica %?+%ri,%&ta' @8 5C
995C F$%&t%: E'a()raci*& +r)+ia
Gra0ca .% 'a C$ra .% /$-i*&
t%,+%rat$ra t%,+%rat $ra - ti%,+) 100 (0 #0 70 B0 tem4eratura c
50 ,0 30 20 10 0
> .% %rr)r 834>
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
E&/ria,i%&t) TABLA 4: /nriamiento
+em4eratura + em4eratura inicia% (, C Ti%,+) T%,+%rat$r Ti%,+) T%,+%rat$r Ti%,+) T%,+%rat$r Ti%,+) T%,+%rat$r 6,i&7 a 65C7 6,i&7 a 65C7 6,i&7 a 65C7 6,i&7 a 65C7
0>5 1 1>5 2 2>5 3 3>5 , ,>5 5 5>5 B
(3>5 (3 (2 (1># (1 #(>3 #( ## #7>3 #B># #B #5>(
B>5 7 7>5 # #>5 ( (>5 10 10>5 11 11>5 12
#5>5 #5 #, #3>5 #3 #2>3 #1>( #1 #0># #0 7(># 7(>7
12>5 13 13>5 1, 1,>5 15 15>5 1B 1B>5 17 17>5 1#
7( 7# 7# 7# 7# 7# 7# 7# 7# 7# 7# 77>5
1#>5 1( 1(>5 20 20>5 21 21>5 22 22>5 23 23>5 2,
FUENTE /%aboración 4ro4ia 4ro4ia Ta('a ;: E de error +em4eratura +em4eratura de so%idi
+em4eratura +em4eratura de so%idi
E de error
#0 C
7#C
2>5E
F$%&t%: /%aboración 4ro4ia
t Solidificacion=13 minutos
77>3 77 7B>5 7B 75>, 75 7, 73>5 73 72 71 70
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
T (°C) Vs t (s) 98 93 88
t%,+%rat$ra 65C7
83 78 73 68
0
5
10
15
ti%,+) ti%,+) 6-7
F$%&t%: /%aboración 4ro4ia
20
25
3
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
correcta así como tambin influye las condiciones climáticas las cuales afectan las propiedades físicas de los instrumentos! "sí tambin se obser#a en la experiencia que cuando la naftalina alcanza la temperatura de fusión y de solidificación, aquella es constante el cual se puede obser#ar en las $ráficas realizadas, esta temperatura permanece constante debi debido do al camb cambio io de fase fase y al calo calorr late latent nte e que que indi indica ca que que cuan cuando do una una sustancia cambia de fase absorbe o cede calor sin que se produzca un cambio de su temperatura!
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
"l disminuir la ener$ía se produce una disminución de temperatura, $enerando el paso de líquido a sólido o solidificación!
&urant &urante e la fusión fusión,, las molcu molculas las que forman forman la naftal naftalina ina sólida sólida se #an separando entre ellos cada #ez lle$ando a romper la fuerza de cohesión intermolecular por la acti#ación de las molculas!
&urante la solidificación, las molculas que forman la naftalina liquida sufren un fenóme fenómeno no de rea$ru rea$rupam pamien iento to perdie perdiendo ndo dinami dinamismo smo interm intermole olecul cular ar tornando su arquitectura a cuerpo sólido!
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
)ntre las recomendaciones que podemos mencionar están, que se debe de tratar de tomar las medidas de la temperatura con mayor precisión, cuando se realiza el cambio del ob*eto se debe de realizar lo más rápido posible, sin prdida de tiempo( con el fin de e#itar una prdida de calor en el medio ambi ambien ente te!! Trata ratarr que que la cant cantid idad ad de calo calorr que que se aplic aplica a perm perman anez ezca ca constante durante toda la experiencia y e#itar el menor error posible! "ntes del experimento re#isar re#isar los instrumentos de traba*o! traba*o!
+oner el termómetro en forma #ertical y no de*ar que toque la base del #aso!
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
Jurbano S>8 Jurbano / :20 :200,;8 Gracia C> Física Genera%> Gener a%> /ditoria% +ebar> ebar>
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
T 65C7 !- t 6-7 (# (3 ##
t%,+%rat$ra t%,+%rat $ra 65C7 65C 7 #3 7#
7# 73 B#
0
5
10 15 2 0 25 3 0
ti%,+) ti %,+) 6-7
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
K La tem tem4 4er erat atur ura a "a "a des desce cend ndie iend ndo o de de (, C a 7( 7(C C desde e% tiem4o en minutos :0 K 12>5;> K '% %%e=ar a 7#C se obser"a 9ue %a tem4eratura no "aría :+ C constante;8 siendo estos 4untos e% cambio de ase :%í9uido K so%ido; en %os minutos :1( K 23>5;> K /n %os %os si= si=ui uient entes es minu minuto toss %a tem4 tem4er erat atur ura a dis dismi minu6 nu6e e asta %%e=ar a 70C8 donde se obser"a a %a nata%ina so%idi
4 C)i&c C)i&ci.% i.%& & %' +$ +$&t) &t) .% /$-i*& /$-i*& 1 -)'i.i -)'i.i0ca 0caci* ci*& & %& %' +r)c%-)
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
K $osib%emente se deba a %as condiciones de %as c%im!ticas %as cua%es aectan %as 4ro4iedades ísicas de %os %os inst instru rume ment ntos os88 as asíí co como mo tamb tambi? i?n n una una inco incorrre rect cta a 4ostura en %a toma de tem4eratura>
E- +)-i('% .%t%r,i&ar 'a ca&ti.a. .% ca')r +)r $&i.a. .% ti%,+) $% -% .%-+r%&.% %& %' +r)c%-) .% -)'i.i0caci*& K Si es 4os osiib%e b%e8 6a 6a 9ue 9ue •
F%ujo de ca%or dMd+ N mCe d+Mdt
K /s ento entonc nces es 9ue 9ue se 4ued 4uede e deter eterm minar nar es estte Ouj Oujo de ca%or 6a 9ue se conoce e% "a%or de %a masa8 e% "a%or de%
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LABORATORIO 09:
CAMBIOS DE FASE DE LA NAFTALINA
4astos 4astoso@ o@ esto esto corres4 corres4ond onde e a cuer4o cuer4oss ormado ormadoss 4or mezc%as :cuer4os con a%to coe
EJ%,+'): c%ra