Question #253ed

1 Answer
anor277
May 28, 2017

"Sublimation is an example of physical change......."

Explanation:

a. "Physical changes" are largely changes of state......

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

I_2(s) rightleftharpoons I_2(g)

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 "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?

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