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a)
CaCO3 -to-> CaO + CO2
CaO + 3C -> CaC2 +CO
CaC2 + 2H2O ->C2H2 + Ca(OH)2
Bài 1: 4Na+O2->2Na2O
(2): Na2O +H2O -> 2NaOH
(3): 2NaOH + BaCl2-> 2NaCl + Ba(OH)2
(4): NaCl + AgNO3-> AgCl + NaNO3
phần 2:
(1) 2NaOH + CO2-> Na2CO3 + H2O
(2) Na2CO3 +CaCl2- > CaCO3 + 2NaCl
(3) CaCO3-t0-> CaO + CO2
(4) CaO +H2O -> Ca(OH)2
(5) Ca(OH)2 + BaCl2-> Ba(OH)2 + CaCl2
Bài 1:
1) 4Na + O2 --to--➢ 2Na2O
Na2O + H2O → 2NaOH
2NaOH + 2HCl → 2NaCl + H2O
NaCl + AgNO3 → NaNO3 + AgCl
2) 2NaOH + CO2 → Na2CO3 + H2O
Na2CO3 + CaCl2 → 2NaCl + CaCO3
CaCO3 --to--➢ CaO + CO2
CaO + H2O → Ca(OH)2
Ca(OH)2 + 2HCl → CaCl2 + 2H2O
2NaCl + 2H2O \(\underrightarrow{đpddcmn}\)2NaOH + Cl2 + H2
Cl2 + H2 \(\rightarrow\)2HCl
Fe2O3 + 6HCl \(\rightarrow\)2FeCl3 + 3H2
2FeCl3 + Cu \(\rightarrow\)CuCl2 + 2FeCl2
Bạn tự cân bằng nhé
1/O2+H2->H2O
Cu+O2->CuO
CaO+H2O->Ca(OH)2
2/O2->H2O->NaOH->NaCl
O2+H2->H2O
H2O+ Na->NaOH+ H2
NaOH+ HCl->NaCl+H2O
3/nH2=6,72/22,4=0,3mol
2Na+2H2O->2NaOH+H2
0,6 0,6 0,6 0,3 mol
mNa=0,6*23=13,8g
Câu 4:
\(n_{H_2SO_4}=\dfrac{200.19,6}{98.100}=0,4mol\)
\(n_{BaCl_2}=\dfrac{50.25}{208.100}\approx0,06mol\)
H2SO4+BaCl2\(\rightarrow\)BaSO4\(\downarrow\)+2HCl
-Tỉ lệ: \(\dfrac{0,4}{1}>\dfrac{0,06}{1}\rightarrow H_2SO_4dư\)
\(n_{H_2SO_4\left(pu\right)}=n_{BaSO_4}=n_{BaCl_2}=0,06mol\)
\(m_{BaSO_4}=0,06.233=13,98gam\)
\(n_{HCl}=2n_{BaCl_2}=2.0,06=0,12mol\)
\(n_{H_2SO_4\left(dư\right)}=0,4-0,06=0,34mol\)
\(m_{dd}=200+50-13,98=236,02gam\)
C%HCl=\(\dfrac{0,12.36,5}{236,02}.100\approx1,9\%\)
C%H2SO4=\(\dfrac{0,34.98}{236,02}.100\approx14,12\%\)
Câu 1:\(\%O=\dfrac{48}{2R+48}.100=47\rightarrow\)(2R+48).47=4800
\(\rightarrow\)94R+2256=4800\(\rightarrow\)94R=2544\(\rightarrow\)R=27(Al)
\(1.NH_4HCO_3\underrightarrow{^{to}}NH_3+CO_2+H_2O\)
__X__________Y_____Z_______T
\(2.NH_4HCO_3+NaCl\underrightarrow{^{to}}NaHCO_3+NH_4Cl\)
_____________________P___________Q
\(3.2NaHCO_3\underrightarrow{^{to}}Na_2CO_3+CO_2+H_2O\)
_______________A___________________
\(4.NaHCO_3+NaOH\rightarrow Na_2CO_3+H_2O\)
\(5.2NH_4Cl+Ca\left(OH\right)_2\rightarrow CaCl_2+2HN_3+2H_2O\)
_________________________B___________________
\(6.Na_2CO_3+Ca\left(OH\right)_2\rightarrow CaCO_3+2NaOH\)
__________________________D_______________
\(7.NaHCO_3+Ca\left(OH\right)_2\rightarrow NaOH+CaCO_3+H_2O\)
\(8.CO_2+H_2O+Na_2CO_3\rightarrow2NaHCO_3\)
a,
Ca: kim loại
CaO: oxit bazo
Ca(OH)\(_2\) : bazo
CaCl\(_2\) : Muối
HCl: axit
Cl\(_2\) : khí clo
b, \(2Ca+O_2\rightarrow2CaO\)
\(CaO+H_2O\rightarrow Ca\left(OH\right)_2\)
\(Ca\left(OH\right)_2+CuCl_2\rightarrow Cu\left(OH\right)_2+CaCl_2\)
\(CaCl_2+H_2\rightarrow Ca+2HCl\)
\(4HCl+MnO_2\rightarrow MnCl_2+Cl_2+2H_2O\)
1/2 Cu + O2 --t-> 2CuO
2/ 2Al + 3CuCl2 -----> 2AlCl3 + 3Cu
3/ Na2SO4 + Ba(NO3)2 ----> BaSO4 + 2NaNO3
4/ Fe2O3 + 3CO --t--> 2Fe + 3CO2
5/ 2FeO + 4H2SO4 đặc nóng --t--> Fe2(SO4)3 + SO2 + 4H2O
Trong đó B,C là các oxit axit
C + H2O -> D