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PROIECT
CLASA VII
OBȚINEREA CRISTALELOR
SARE DE BUCĂTĂRIE/ZAHĂR
Realizat prof. Chimie /Biologie
Bodenciu Florina
Sc.Gim.,,Miron Pompiliu,,Stei
SCOPUL EFECTUĂRII
PROIECTULUI
Dezvoltarea spiritului de observație, formarea
competențelor de utilizare a substanțelor
chimice, răbdării și acurateței.
Respectarea regurilor de securitate
Studierea operațiilor chimice unitare, purificarea
sării prin obținerea cristalelor frumoase și mari,
documentarea experimentului.
Reactivi și ustensile: sare de bucătărie,
zahăr,pahar/borcănaș de 150-200 ml, creion,
ață, etc
Etapele
 Am pregatiti soluția de saturată de sare
sau zahăr(la zahăr pentru un efect mai
spectaculos v-om colora soluția cu
colorant de culoare roșie)
 Pentru aceasta am adăugat in apa caldă
sare sau zahăr și am amestecat bine
soluția(până când zahărul sau sarea nu
se mai dizolvă in apă)
 Am pregătit firul pentru
urzeală.,legând firul de ață de un
creion sau spatulă.Firul de ață nu
trebuie să ajungă în partea de jos a
paharului sau cănii.(pentru soluția de
zahăr am folosit numai spatulă)
 Am așezăt cănuță(paharul) cu soluțiile
obținute pe o suprafață plană la cald.
 Am urmărit creșterea cristalelor timp
de două săptămâni
Exemplele de cristale obținute de elevii cl
VII
concluzii
 Substanța obținută(cristalul de
zahăr/sare)se obține în urma evaporării
lente a apei din soluția saturată(de
zahăr/sare)
 Cristalul de sare de bucătărie și zahăr au
forma diferite și nu corespund parțial
cristalelor de zahăr și sare conform
informațiilor din literatură
 Masa cristalului de sare este de 2gr./iar a
zaharului (roșu)este de 3gr .

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  • 1. PROIECT CLASA VII OBȚINEREA CRISTALELOR SARE DE BUCĂTĂRIE/ZAHĂR Realizat prof. Chimie /Biologie Bodenciu Florina Sc.Gim.,,Miron Pompiliu,,Stei
  • 2. SCOPUL EFECTUĂRII PROIECTULUI Dezvoltarea spiritului de observație, formarea competențelor de utilizare a substanțelor chimice, răbdării și acurateței. Respectarea regurilor de securitate Studierea operațiilor chimice unitare, purificarea sării prin obținerea cristalelor frumoase și mari, documentarea experimentului.
  • 3. Reactivi și ustensile: sare de bucătărie, zahăr,pahar/borcănaș de 150-200 ml, creion, ață, etc
  • 4. Etapele  Am pregatiti soluția de saturată de sare sau zahăr(la zahăr pentru un efect mai spectaculos v-om colora soluția cu colorant de culoare roșie)  Pentru aceasta am adăugat in apa caldă sare sau zahăr și am amestecat bine soluția(până când zahărul sau sarea nu se mai dizolvă in apă)
  • 5.  Am pregătit firul pentru urzeală.,legând firul de ață de un creion sau spatulă.Firul de ață nu trebuie să ajungă în partea de jos a paharului sau cănii.(pentru soluția de zahăr am folosit numai spatulă)  Am așezăt cănuță(paharul) cu soluțiile obținute pe o suprafață plană la cald.  Am urmărit creșterea cristalelor timp de două săptămâni
  • 6. Exemplele de cristale obținute de elevii cl VII
  • 7. concluzii  Substanța obținută(cristalul de zahăr/sare)se obține în urma evaporării lente a apei din soluția saturată(de zahăr/sare)  Cristalul de sare de bucătărie și zahăr au forma diferite și nu corespund parțial cristalelor de zahăr și sare conform informațiilor din literatură  Masa cristalului de sare este de 2gr./iar a zaharului (roșu)este de 3gr .