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Arazo
egoera:
bilikidodesberdin
identifikatzea
Irakasleak banatutako bi
likido desberdinak
identifikatzen saiatzea
da gure helburua.
Hipotesiak
Lehenengo prezipitatu ontzi bat
usaindu genuen eta alkoholaren
usaina zuen,ondoren bestea usaindu
eta ez zeukanez, ura eta alkohola
zirela pentsatu genuen.
OINARRI TEORIKOA
Praktikaren oinarria likido bakoitzaren dentsitatea ateratzea zen. Behin dentsitateak atera
ezkero oso erraza zen gainerakoa: liburuko taulan begiratzea likido bakoitzaren dentsitatea.
Dentsitatea ateratzeko lehenik eta behin likidoa pisatu behar genuen eta ondoren bolumena
kalkulatu (D= g/ml). Behin hau jakinda erraza zen gainerakoa.
1. Adierazi itzazue zuen likidoen bi propietate orokor gutxienez eta gutxienez bi bereizgarri. Gero egingo
dituzue neurketak.
- Propietate orokorrak dira substantzia bat identifikatzeko baliorik ez dutenak. Masa, bolumena eta
gorputzaren tenperatura adibidez propietate orokorrak dira
- Propietate bereizgarriak dira substantzia bakoitzean berezko balioa eta berezia dutenak. Dentsitatea,
urtze-puntua, irakite-tenperatura, gogortasuna eta abar dira adibidez.
2. Aipa itzazue bolumena eta masa zehatzak neurtzeko erabiltzen diren tresna zehatzak.
Prezipitatu ontzia,balantza elektronikoa, probeta, kalkulagailua, boligrafoa eta papera.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-
MATERIALA
- Probeta bat
- 2 prezipitatu ontzi:
2 produktu
desberdinekin
barruan.
- Balantza bat
-Papera eta boligrafoa
PROZEDURA
1. Likidoa duten prezipitatu ontzietatik bat hartuko
dugu, balantza elektronikoan jarri eta honek
amandako zenbakia paper batean apuntatuko dugu.
2. Behin honen pisua hartuta, prezipitatu ontziko
barruko likidoa probetara botako dugu eta berriro
ere prezipitatu ontzia balantza eletrikoan jarriko
dugu, baina oraingoan likido gabe. Ateratzen den
emaitza paperean apuntatu eta kenketa baten
bidez, barruko likidoaren masa kalkulatuko dugu.
3. Prezipitatu ontziko ura probetan dagoelarik,
honen bolumena kalkulatuko dugu ura noraino
eltzen den ikusiz. Hau ere paperean apuntatuz.
MAGNITUDEAK 1 LIKIDOA 2 LIKIDOA
masa (g) 16,31g 18,63g
bolumena (ml) 18ml 22ml
MASA LIKIDOA ETA
PREZIPITATU ONTZIA
PREZIPITATU ONTZIA
1 likidoa 52,34g 36,03g
2 likidoa 60,02g 41,39g
MASA
BOLUMENA
1 likidoa: 52,34 - 36,03 = 16,31g 1 likidoa: 18ml
2 likidoa: 60,02 - 41,39 = 18,63g 2 likidoa: 22ml
DENTSITATEA
1 likidoa: 16,31:18 =
0,9061111 g/ml
ONDORIOAK
Alkohola Ura
Liburuko taula 0,9g/mL 1g/mL
Gure emaitza 0,8292g/mL 0,9382g/mL
Alkohola estalita zegoen
prezipitatu ontzia zen. Bestea
ura zen.
Ondorio nagusia beraz urak
alkoholak baino dentsitate
handiagoa duela.
Beste ondorio batzuk ere atera
ditugu, hauen artean adibidez,
material asko ez dela behar bi

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Arazo egoera- bi likido desberdin identifikatzea

  • 2. Irakasleak banatutako bi likido desberdinak identifikatzen saiatzea da gure helburua.
  • 3. Hipotesiak Lehenengo prezipitatu ontzi bat usaindu genuen eta alkoholaren usaina zuen,ondoren bestea usaindu eta ez zeukanez, ura eta alkohola zirela pentsatu genuen.
  • 4. OINARRI TEORIKOA Praktikaren oinarria likido bakoitzaren dentsitatea ateratzea zen. Behin dentsitateak atera ezkero oso erraza zen gainerakoa: liburuko taulan begiratzea likido bakoitzaren dentsitatea. Dentsitatea ateratzeko lehenik eta behin likidoa pisatu behar genuen eta ondoren bolumena kalkulatu (D= g/ml). Behin hau jakinda erraza zen gainerakoa. 1. Adierazi itzazue zuen likidoen bi propietate orokor gutxienez eta gutxienez bi bereizgarri. Gero egingo dituzue neurketak. - Propietate orokorrak dira substantzia bat identifikatzeko baliorik ez dutenak. Masa, bolumena eta gorputzaren tenperatura adibidez propietate orokorrak dira - Propietate bereizgarriak dira substantzia bakoitzean berezko balioa eta berezia dutenak. Dentsitatea, urtze-puntua, irakite-tenperatura, gogortasuna eta abar dira adibidez. 2. Aipa itzazue bolumena eta masa zehatzak neurtzeko erabiltzen diren tresna zehatzak. Prezipitatu ontzia,balantza elektronikoa, probeta, kalkulagailua, boligrafoa eta papera. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ -
  • 5. MATERIALA - Probeta bat - 2 prezipitatu ontzi: 2 produktu desberdinekin barruan. - Balantza bat -Papera eta boligrafoa
  • 6. PROZEDURA 1. Likidoa duten prezipitatu ontzietatik bat hartuko dugu, balantza elektronikoan jarri eta honek amandako zenbakia paper batean apuntatuko dugu. 2. Behin honen pisua hartuta, prezipitatu ontziko barruko likidoa probetara botako dugu eta berriro ere prezipitatu ontzia balantza eletrikoan jarriko dugu, baina oraingoan likido gabe. Ateratzen den emaitza paperean apuntatu eta kenketa baten bidez, barruko likidoaren masa kalkulatuko dugu. 3. Prezipitatu ontziko ura probetan dagoelarik, honen bolumena kalkulatuko dugu ura noraino eltzen den ikusiz. Hau ere paperean apuntatuz.
  • 7. MAGNITUDEAK 1 LIKIDOA 2 LIKIDOA masa (g) 16,31g 18,63g bolumena (ml) 18ml 22ml
  • 8. MASA LIKIDOA ETA PREZIPITATU ONTZIA PREZIPITATU ONTZIA 1 likidoa 52,34g 36,03g 2 likidoa 60,02g 41,39g MASA BOLUMENA 1 likidoa: 52,34 - 36,03 = 16,31g 1 likidoa: 18ml 2 likidoa: 60,02 - 41,39 = 18,63g 2 likidoa: 22ml DENTSITATEA 1 likidoa: 16,31:18 = 0,9061111 g/ml
  • 9. ONDORIOAK Alkohola Ura Liburuko taula 0,9g/mL 1g/mL Gure emaitza 0,8292g/mL 0,9382g/mL Alkohola estalita zegoen prezipitatu ontzia zen. Bestea ura zen. Ondorio nagusia beraz urak alkoholak baino dentsitate handiagoa duela. Beste ondorio batzuk ere atera ditugu, hauen artean adibidez, material asko ez dela behar bi