SOMEONE HELP ME PLEASE I’LL GIVE

Chemical change
physical change

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?