Question

13
drew learned that glass is made from sand. he found a pile of sand, but it did not look or behave much like glass. he tried reshaping the pile of sand and pressing on it, but he could not turn it into glass. why could drew not make the sand into glass?
a. glass is solid, so the sand needed to be frozen.
b. the sand needed to start out looking more like glass.
c. the grains of sand were too closely packed together.
d. making glass from sand requires a chemical reaction.

Explanation:

Making glass from sand requires heating sand (silicon dioxide) to high temperatures, causing it to melt and then cool into an amorphous solid. This process involves a physical change but the key point is that simple reshaping/pressing (physical manipulation) is insufficient—heat (a necessary condition for the transformation) was missing. Among the options, D is the most accurate as the transformation requires a process (related to chemical/physical change conditions) that Drew didn’t provide.

Answer:

D. Making glass from sand requires a chemical reaction.