2BF₃ + 3Li₂SO₃ ----> B₂(SO₃)₃ + <u>6LiF
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your answer is <u>D</u><u>.</u><u> </u>physical change, because a new substance is not formed.
<span>An unsaturated solution is one that has a concentration lower than it's solubility. What happens is all of the solute dissolves in the solvent. For example, dumping a spoon of sugar into coffee ends up with an unsaturated solution. Because all the sugar dissolves into the solvent (the coffee).</span>
