Question

Ajutor ofer 52 de puncte va multumesc multtt!!!

Answer 1

I.

a) +1 ; b) -1 ; c) 0 ; d) cedeaza ; e) +1

II.

N(-3)H3 ; HN(+5)O3; HN(+3)O2; H2S(+4)O3; H2O(-2)

H2(SO4)(-2); P(+3)2O3; P(+5)2O5; H3P(+5)O4; H2S(-2)

III.

a)

0       +1  -1      +2 -1       0

Zn  +  HCl => ZnCl2 + H2

1x  Zn(0)__-2e-__> Zn(+2) oxidare (ag. reducator, Zn)

2x H(+1)__+e-__> H(0) reducere (ag.oxidant, HCl)

Zn  +  2HCl => ZnCl2 + H2

b)

+2 -2     0         0     +1   -2

CaO  + H2  => Ca + H2O

1x   Ca(+2)__+2e-__> Ca(0) reducere (ag. oxidand,Ca)

2x   H(0)__-e-__> H(+1) oxidare (ag. reducator, H2)