Answer:
Dry ice undergoes sublimation, an endothermic change at room temperature.
It might change because of the amout of rain that fell in the year and the melting of ice which allows the water amount to increase
1635 miles/hr.
Hope this helps
A proper ionic formula has a cation and an anion in it; an ionic compound is never formed between two cations only or two anions only. The key to writing proper ionic formulas is simple: the total positive charge must balance the total negative charge.