Classify each as either a solid a liquid or a gas at room temperature a-milk
b-air
c-copper
d-helium
e-diamond
f-candle wax

The following transition occurs at a molecular level for a substance. what transition corresponds to this change in microscopic structure? the carbon dioxide molecules on the left are in a regular, tightly packed pattern. after heating, it becomes much lower density. a. melting b. boiling c. sublimation d. freezing