Item SB005001: If the number of atoms in the sealed jar stayed the same, the mass of the jar and everything inside it will stay the same because the mass of the atoms inside the jar stayed the same.

A student placed a liquid in a jar and sealed it. Then she heated the liquid and it turned into a gas. If the number of atoms in the sealed jar stayed the same, what happened to the mass of the jar and everything inside it after she heated it?

  1. The mass increased because the mass of the atoms inside the jar increased.
  2. The mass decreased because the mass of the atoms inside the jar decreased.
  3. The mass stayed the same because the mass of the atoms inside the jar stayed the same.
  4. Whether the mass increased, decreased, or stayed the same depends on whether a chemical reaction occurred.
Distribution of Responses
Chart showing distrubtion of responses for Item 005001
Points Earned
Group Correct Total Percent
Overall 179 353 51%
Grades
  6–8 179 353 51%
  9–12 N/A N/A N/A
Gender
  Male10519055%
  Female7416345%
Primary Language
  English16632651%
  Other132748%

View data table

Distribution of Responses
Chart showing distrubtion of responses for Item 005001
Points Earned
Group Correct Total Percent
Overall 264 341 77%
Grades
  6–8 264 341 77%
  9–12 N/A N/A N/A
Gender
  Male13718176%
  Female12716079%
Primary Language
  English25531581%
  Other92635%

View data table

None identified