Item AM031004: The bubbles that form when water boils are made of water molecules.

When water boils, bubbles rise to the surface of the water. What are the bubbles made of?

  1. Air molecules
  2. Heat molecules
  3. Water molecules
  4. Oxygen molecules

Distribution of Responses

Chart showing distrubtion of responses for Item AM031004

Percent of students responding correctly

Overall15%
Grades 6–813%
Grades 9–1218%
Male16%
Female14%
Primary Language is English15%
Primary Language is not English17%

View data table