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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