Please answer, please answer please answer please answer
my last 2 chemistry question.

1. filtration and evaporation

2. i) water is added to the sand and salt mixture

ii) then the mixture is filtrated and so the sand and the salt water was seperated

iii) the salt water is heated with the help of burner until the water gets evaporated

iv) after the water gets evaporated, the salt is remained in the container

3. observation:

on adding water to the mixture, the salt is completely dissolved in the waterwhen filtrated the sand is seperated from the salt waternow the salt water when heated with the burner until the evaporation, the water is evaporatedthe salt is precipitated and remained in the container

4. cautions:

while using the burner, we should be cautious with firethe container that is heated should be holded with the help of a cloth to avoid heat

A. volume stays constant. just took took the quiz

Anyone know the answer?