Vòng 1

Câu 1:

A: Al

B: Al₂(SO₄)₃

C: Al(OH)₃

D: AlCl₃

Các PTHH lần lượt là:

1: \(2Al+3H_2SO4->Al_2\left(SO_4\right)_3+3H_2\uparrow\)

2: \(Al_2\left(SO_4\right)_3+6KOH_{\left(vừa.đủ\right)}->2Al\left(OH\right)_3\downarrow+3K_2SO_4\)

3: \(2Al\left(OH\right)_3+6HCl->2AlCl_3+3H_2O\)

4: \(2AlCl_3-\left(đpnc\right)->2Al+3Cl_2\uparrow\)

Câu 2:

A: C₂H₄

X: H₂O

B: C₂H₅OH

C1: CH₃COOH

Y1: Na

D1: CH₃COONa

Z1: H₂SO₄

E1: Na₂SO₄

T: BaCl₂

F: NaCl

C2: H₂O

Y2: Na

D2: NaOH

Z2: H₂CO₃

E2: Na₂CO₃

Các PTHH lần lượt là:

1: \(C_2H_4+H_2O\frac{⇌}{H_2SO_4}C_2H_5OH\)

2: \(C_2H_5OH+O_2\frac{men.giấm}{t^0}>CH_3COOH+H_2O\)

3: \(CH_3COOH+Na->CH_3COONa+\frac{1}{2}H_2\uparrow\)

4: \(2CH_3COONa+H_2SO_4⇌2CH_3COOH+Na_2SO_4\)

5: \(Na_2SO_4+BaCl_2->BaSO_4\downarrow+2NaCl\)

6: \(H_2O+Na->NaOH+\frac{1}{2}H_2\uparrow\)

7: \(NaOH+H_2CO_3->Na_2CO_3+H_2O\)

8: \(Na_2CO_3+BaCl_2->BaCO_3\downarrow+2NaCl\)