Vòng 1

Bài 1: 

A là Na ; B: Na₂O; C: NaOH; D: NaCl

phương trình hóa học:

4Na + O₂ \(\underrightarrow{t^o}\) 2Na₂O

\(Na_2O+H_2O\rightarrow NaOH\)

\(NaOH+HCl\rightarrow NaCl+H_2O\)

\(2NaCl\underrightarrow{đpnc}2Na+Cl_2\)

Bài 2:

\(C_{12}H_{22}O_{11}+H_2O\rightarrow C_6H_{12}O_6+C_6H_{12}O_6\)

\(C_6H_{12}O_6\underrightarrow{men}2C_2H_5OH+2CO_2\)

\(C_2H_5OH+O_2\rightarrow CH_3COOH+H_2O\)

\(CH_3COOH+CH_3OH\rightarrow CH_3COOCH_3+H_2O\)

\(CH_3COOCH_3+NaOH\rightarrow CH_3COONa+CH_3OH\)