почему тает снег на тротуаре посыпанном солью?

нужно обоснованное решение... 

K+N2=

Li+C=

Na+H3PO4=

LiOH+HNO3=

RbOH+H2SO4=

NaOH+CO2=

KOH+SO3=

FeCl3+KOH=

ZnSO4+CsOH=

Помогите пожалуйста)

write the correct form of the verb in brackets and read about Sam s school. Sam Scott _____(go) to school by bus every morning . His lessons_(begin) at 8 o clock. When he ___(enter) the classroom he____(greet) his classmates. His friends_________(talk),_____(read),_(do) crosswords and puzzles. The bell_(ring) and the teacher _______(come) into the classroom. The lesson_____(begin). Everybody___(be) busy.

какие плюсы и минусы свободы подростков?