Item SC057008: Two solids with the same melting point and color could be the same substance. (This item uses a table that lists properties of the solids.)

A student makes some observations about three solids and summarizes the results in the table below.

  Mass Melting Point Color
Solid 1 3.0 g 776°C white
Solid 2 3.0 g 445°C white
Solid 3 9.8 g 445°C white

Could any of the solids be the same substance and why?

  1. Solids 1 and 2 could be the same substance. Even though they do not have the same melting point, they have the same mass.
  2. Solids 2 and 3 could be the same substance. Even though they do not have the same mass, they have the same melting point and color.
  3. Solids 1, 2, and 3 could all be the same substance. Even though they do not all have the same mass and melting point, they have the same color.
  4. Solids 1, 2, and 3 cannot be the same substance because they have different combinations of color, melting point, and mass.

Distribution of Responses

Chart showing distrubtion of responses for Item SC057008

Percent of students responding correctly

Overall52%
Grades 6–846%
Grades 9–1257%
Male53%
Female51%
Primary Language is English52%
Primary Language is not English51%

View data table