I
1-A, 2-F, 3-A, 4-F, 5-A, 6-F, 7-F, 8-A, 9-A, 10-A
II.
a, c, e, f, g, h
III.
[H3O+] = 10⁻⁴ M
=> stim ca [H3O+] = Ca = 10la-pH = 10⁻⁴
=> pH = 4
[H3O+] = 10⁻⁶ M
=> stim ca [H3O+] = Ca = 10la-pH = 10⁻⁶
=> pH = 6
=>
scara pH = 1 ...pH=4...pH=6...pH=7....pH=10
IV.
avem pH=4 => solutie acida
turnesol fenolftaleina metiloranj
rosu incolora rosu
V.
reversibile:
2SO2 + O2 <==> 2SO3
N2 + 3H2 <==> 2NH3
ireversibile
NaHCO3 + HCl --> NaCl + H2O + CO2
BaCl2 + H2SO4 --> BaSO4 + 2HCl
CuSO4 + 2NaOH --> Cu(OH)2 + Na2SO4
