7-Be,Mg,Ca,Sr,Ba,Ra (2. skupina)

Question 1

pridobivanje Mg (IND, 7 reakcij)

Answer 1

CaCO3 → CaO + CO2
CaO + H2O → Ca(OH)2

MgCl2 + Ca(OH)2 → Mg(OH)2 + CaCl2

Mg(OH)2 + 2 HCl → MgCl2 + 2 H2O

MgCl2 (aq) → MgCl2*xH2O

MgCl2*xH2O → MgCl2 + x H2O

MgCl2 →((elektroliza))→ Mg(s) + Cl2(l)

Question 2

Element 2. sk +DUŠIK

Answer 2

3 M(s) + N2 → M3N2

Question 3

Element 2. sk + ŽVEPLO

Answer 3

8 M + S8 → 8 MS

Question 4

Element 2. sk + HALOGENI

Answer 4

M + X2 → MX2

Question 5

Be(OH)2 je amorfen

Answer 5

Be(OH)2 + 2 H3O(+) → Be(H2O)4
in
Be(OH)2 + 2 OH(-) → Be(OH)4

Question 6

Al(OH)3 je amfoteren

Answer 6

Al(OH)3 + 3 HCl → AlCl3 + 3 H2O
in
Al(OH)3 + NaOH → Na[Al(OH)4]

Question 7

ZEM.ALK. kovine + KISIK

Answer 7

2 M + O2 → 2MO

Question 8

oksidi Mg, Ca, Sr, Ba so BAZIČNI

Answer 8

MO + H2O → M(OH)2

Question 9

termični razpad soli in hidroksidov

Answer 9

MgCO3 → MgO + CO2

2 Ca(NO3)2 → 2 CaO + 4 NO2 + O2

Ca(OH)2 → CaO + H2O

Question 10

priprava topnih Ba soli

Answer 10

BaSO4 + 4 C → BaS + 4 CO
naprej 2 možnosti:

BaS + 2 HCl → BaCl2 + H2S
ali
BaS + 2 HNO3 → Ba(NO3)2