Well research shows that it's not technically a chemical change. you need to find out whether you are looking for silica or to use glass changes on a molecular level when heated or if it's melted into another form (physical change). It appears that to make glass you simply melt silica into the resulting product, which is glass. there is not a chemical change or molecular change. Therefore, <u>making glass<em /></u> from sand is a <u>physical</u>, not a chemical change.
