It would be an physical change ; if you melt butter the butter goes from a solid to a liquid so therefore the physical state is changed.
SO4 -2, or Sulfate
Hope this helps! :)
i think its MIDDLE FINGERS UP IN THE SKY AND AT THESE AHOLE MODERATORS
When baking soda is mixed with vinegar, something new is formed. The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution.
