Page 15 - Finalll Science BB Prep2 t1 2025_Neat

Matter changes are reversible processes

Physical changes

As no change in the matter composition & no new substance is produced

Melting Freezing Evaportation Condensation

The change of The change of The change of The change of
matter from matter from matter from matter from gas
solid to liquid liquid to solid liquid to gas by to liquid by
by heating. by cooling. heating. cooling.
When gas
Molecules Molecules lose Molecules touches a cold
gain thermal thermal gain thermal object, its
energy energy energy molecules lose
thermal energy
Force holds Force holds Force holds
them them them Force holds
decreases increases decreases them increases

Molecules Molecules Molecules Molecules
move faster move slower move faster move slower
away and get close away and get close

• The loss of thermal energy from water vapor molecules (Cause)

results in its condensation “fog, dew, clouds” (Effect)

First Term 24