# Question #253ed

May 28, 2017

$\text{Sublimation is an example of physical change.......}$

#### Explanation:

$a . \text{Physical changes}$ are largely changes of state......

And for sublimation we can write the reaction...........

${I}_{2} \left(s\right) r i g h t \le f t h a r p \infty n s {I}_{2} \left(g\right)$

Since no chemical bonds are broken, other than the weak dispersion forces between the iodine molecules, this is an example of physical change, and thus we answer $b .$

For $c .$ you simply draw the $\text{mollykewells}$ of iodine over the other side of the ampoule...........

For $d .$ and $e .$ you have a sealed ampoule; mass neither leaves nor enters the system. The mass remains constant.

Capisce?