A change from physical change into chemical change not sure hope this helps
It is important to use low flame when evaporating water from a recovered filtrate because then the water and filtrate will not spatter and the filtrate can also be recovered after evaporating water.
If flame is not low then water as well as got spatter so it is important to use low flame so that the water and filtrate will not spatter.
the answer is B because I jus did that
Because you introduce two reactants, causing them to produce a new chemical product. :)