Zadanka z chemii;) łatwe gimnazjalne NAJ CZEKA
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Zadanka z chemii;) łatwe gimnazjalne NAJ CZEKA
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Ad.25
1.2Ca + O2 ->2 CaO
2.CaO + H2O -> Ca(OH)2
3.Ca(OH)2 + CO2 -> CaCO3 + H2O
4. S + O2 -> SO2
5.SO2 + H2O -> H2SO3
6. Ca(OH)2 + H2SO3 -> CaSO3 + 2H2O
A - CaO - tlenek wapnia
D - Ca(OH)2 wodorotlenek wapnia , wapno gaszone
X - CaCO3 węglan wapnia
E - SO2 tlenek siarki (IV)
Y - H2SO3 kwas siarkowy (IV)
Z - CaSO3 siarczan (IV) wapnia
Ad.26
Mg + I2 -> MgI2
jodek magnezu
Ad.27
6Na + 2H3PO4 -> 2Na3PO4 + 3H2
3Na2O + 2H3PO4 -> 2Na3PO4 + 3H2O
3NaOH + H3PO4 -> Na3PO4 + 3H2O
P2O5 + 6 NaOH- >2 Na3PO4 + 3H2O
Ad.28
I. K - potas
II. H2O - woda
III. H2SO4 - kwas siarkowy (VI)
IV. KOH - wodorotlenek litu
V. K2SO4 - siarczan (VI) potasu
Ad.29
Cp=15%
mr=300g
ms=Cp*mr/100%
ms= 15%*300g/100%
ms= 45g
mH2O= mr-ms
mH2O = 300g-45g = 255g
Ad.30
Cp=ms/mr *100%
Cp = 5g/200g *100%
Cp=2,5%
Ad.31
Dane
Cp1= 2%
mr1= 250g
Cp2 = 4%
mr2= 250g
Obliczenia
Cp = ms/mr*100%
ms= Cp*mr /100%
ms1= 2%*250g/100% = 5g
ms2 = 4%*250g/100% = 10g
Cp3 = ms1+ms2/mr1+mr2 *100%
Cp3 = 15g/500g *100%
Cp3 = 3%