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Vă propun să
jucăm jocul
Ghici ce e?
Motto-ul lecţiei:
„Cine se opreşte din
învăţat, fie la 15 sau la 25
sau 80 de ani acela este un
om bătrîn. Cine învaţă
mereu, rămîne TÎNĂR”.
(Henri Ford)
“Să nu mă grăbesc,
Să las timpul să treacă,
Fiecare secundă-n cădere
Erodează puțin
Suferința.
Să aștept.
Fiecare val ce se sparge
Sapă în stânca
De care-s înlănțuit,
Fiecare fir de rugină
Subțiază lanțul.
Într-un mileniu, în două,
Stânca va fi nisip,
Fierul verigilor pulbere,
Oasele mele, molecule de Calciu
Risipite în apă,
Ana Blandiana Suferința nimic.”
Caracteristica
generală a
calciului
Subcompetenţe:
Elevul va fi capabil:
O1.Să deducă carcteristica generală a
calciului.
O2.Să scrie ecuaţiile reacţiilor chimice ce
ilustrează proprietăţile chimice ale calciului.
O3.Să enumere principalele minerale de
calciu.
O4.Să enumere domenii de utilizare a
calciului.
O5.Să rezolve probleme de calcul şi exerciţii în
baza proprietăţilor calciului.
Structura atomului.
Simbol chimic: Ca;
Ar(Ca)=40 ;
Poziția în sistemul periodic
perioada IV;
Grupa II , subgrupa principală;
Numărul de ordine-20,
Z=+20,e=20,p=20,n=20;
Metal;
Valenţă – II.
Grad de oxidare - +2.
Reducător
Oxidare
Principalele minerale de calciu:
1.Creta , calcar - CaCO3
2.Ghipsul - CaSO4
3.Fosforite - Ca3 (PO4)2
Proprietăţi fizice a calciului:
Calciul este un metal
uşor, moale, alb-
argintiu, foarte
activ.
Proprietăţi chimice a calciului:
1.Interacţiunea cu
oxigenul.
2Ca+O2→
2CaO
2.Interacţiunea cu
clorul.
Ca+Cl2→
CaCl2
3.Interacţiunea cu
sulful.
Ca+S→CaS
4.Interacţiunea cu
apa.
Ca+2H2O→
Ca(OH)2+H2↑+Q
Problemă: Calculează
masa oxidului de calciu
care se formează la
interacţiunea oxigenului
cu calciu.u masa de 80g
Buletinul de identitate al elementului chimic Calciu
Simbolul chimic……………..
Numărul de ordine…………..
Sarcina nucleului…………….
Numărul total de electroni………….
Numărul nivelelor enegetice……….
Repartizarea electronilor pe nivele……………………
Metal sau nemetal ………………..
Valenţele posibile …………………
Gradele de oxidare ……………….
Masa atomică relativă…………………….
Perioada……………………
Grupa……………………
Subgrupa ………………….

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Caracterista generală a calciului