Răspuns:
Explicație:
1 a F ( solvat)
b F (apa)
c F
d A
2. CO2
3.
a.------pura------------amestec
b.---------omogen-----------eterogen
c. ---------omogene---------dizolvare
d. ----------calda-----------rece
4.
NaOH ------apa
lac unghii ------acetona
iod---------alcool
piatra vanata -----apa
grasimi ------benzen
5.
a.
md= 65g zahar
mapa= 135g
c=?
ms= md + mapa
ms= 65 + 135= 200g sol.
c= md .100: ms
c= 65.100 : 200=32,5 %
b.
md=55g
c=11%
ms=?
ms= md.100 : c
ms= 55 . 100 : 11= 500 g sol.
6.
ms1= 200g sol. NaOH
c1=15%
c2=30%
m apa evaporata=?
-se afla md
md= c1 . ms1 : 100
md= 15 . 200 : 100= 30g NaOH
-se afla ms2
ms2= md .100 : c2
ms2= 30 .100 : 30 = 100g sol.
-se afla masa apei evaporate
m apa evap. = 200 - 100= 100g
