Объяснение:
3) 2KMnO4 + 16HCl = 5Cl2 + 2KCl + 2MnCl2 + 8H2O
Mn(+7) +5e = Mn(+2) 2 в-ие
ок-ль
2Cl(-) -2e = Cl2(0) 5 ок-ие
в-ль
4) 130 г Х л
Zn + 2HCl = ZnCl2 + H2
n=1 моль n=1 моль
М=65 г/моль Vm=22,4 л/моль
m=65 г V = 22,4 л
130 г Zn - Х л Н2
65 г Zn - 22,4 л Н2
V(H2) = 130 * 22,4 / 65 =44,8 л
1) N2 + 6Li = 2Li3N
2Fe + 3Cl2 = 2FeCl3
S + O2 = SO2
CaCO3 + 2HCl = CaCl2 + CO2↑ + H2O
Mg + 2HCl = MgCl2 + H2↑
NH3 + HNO3 = NH4NO3
HNO3 + KOH = KNO3 + H2O
2KBr + Cl2 = 2KCl + Br2
2) 4NH3 + 3O2 = 2N2 + 6H2O
N2 + O2 = 2NO
2NO + O2 = 2NO2
2NO2 + H2O = HNO2 + HNO3
HNO3 + KOH = KNO3 + H2O
2KNO3 = 2KNO2 + O2
1) The largest atomic radius has element 1) tin 2) carbon 3) Germanium 4) silicon.
2) Be, Mg Ca, Sc,???
3) All their energy levels are filled to the end, so they do not act as oxidizers and restorers, although they are non-metallic.
4) I agree, that atomic radii, when moved from left to right in the same period, decrease. This is because electrons are more attracted to the nucleus as the core charge increases. Even an increase in the number of electrons on the outer shell (e.g. fluoride compared to oxygen) does not increase the size of the atom. That is, the fluoride atom is smaller than the oxygen atom.
m раствора = 10г + 90г воды = 100г
w вещества = (10г / 100)* 100 = 10%
я так понимаю ответ Б