Page 14 - Finalll Science BB Prep2 t1 2025_Neat

2- Degree of substance’s purity

Changing the The purity is
Impurities amount of Melting tested by
affect the needed and boiling comparing
attraction energy to points the M.P &
force change the change B.P by their
state fixed values

• The increase in boiling point & decrease in freezing / melting

point of a solution depending on its concentration.

The boiling point of the
solution increases 0.5º
C

Dissolving 180 g 100.5º C
glucose in 1 L of

distilled water The freezing point of
the solution decreases
by 1.86º C
- 1.86º C

First Term 23