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ConcepTest: Identifying Oxides

ConcepTest questions by David McConnell, David Steer , Walter Borowski, Jeffrey Dick, Annabelle Foos, Jeffrey Knott, Alvin Konigsberg, Michelle Malone, Heidi McGrew, Kathie Owens, and Stephen Van Horn


Which of the following formulas represents an oxide?

a. FeS2
b. KAlSi3O8
c. Fe2O3
d. CaSO4 · 2H2O

Student Responses:

The correct response is C.
Percentage of students choosing this answer. (% Before Discussion/% After Discussion):

a. FeS2 (6%/3%)
b. KalSi3O8 (10%/3%)
c. Fe2O3 (56%/84%)
d. CaSO4 · 2H2O (28%/10%)

in a small (< 60 students) environmental geology class

If you would like to help acquire more Before and After statistics for this example, please contact the authors (see link at top of page).

References and Notes:


Geoscience:Geology:Mineralogy:Crystal Chemistry, Systematic Mineralogy:Oxides and Hydroxides

Resource Type

Activities:Classroom Activity:Short Activity:ConcepTests

Grade Level

College Lower (13-14):Introductory Level

Ready for Use

Ready to Use

Earth System Topics

Solid Earth:Earth Materials:Minerals


Earth surface


Teach the Earth:Teaching Topics:Minerals, Teach the Earth:Course Topics:Mineralogy, Teach the Earth:Teaching Environments:Intro Geoscience