Original Project
Substances, Chemical Reactions, and Conservation of Matter
Whenever atoms interact with each other, regardless of how they are arranged or rearranged, the total mass stays…
Item SC089005: The number of each kind of atom stays the same during the combustion of propane. (This item uses circles to represent atoms.)
In the diagrams below, atoms are represented by circles, and molecules are represented by circles that are connected to each other. The different colored circles represent different kinds of atoms.
A propane molecule is made up of 3 carbon atoms and 8 hydrogen atoms. An oxygen molecule is made up of 2 oxygen atoms.
This diagram shows one propane molecule and five oxygen molecules.
Which of the following diagrams could represent the molecules formed when propane and oxygen molecules react?
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 1456 | 2837 | 51% |
| Grades | |||
| 6–8 | 735 | 1616 | 45% |
| 9–12 | 717 | 1213 | 59% |
| Gender | |||
| Male | 709 | 1396 | 51% |
| Female | 723 | 1389 | 52% |
| Primary Language | |||
| English | 1277 | 2459 | 52% |
| Other | 145 | 322 | 45% |