Each percentage relates to a particular element — students will need to know how to do percentage composition. Place the abbreviation for each element in order, and you will find the answer. (A hint regarding the answer is “colored poisons.”) Enter your students’ correct solutions into a draw for a Thermoelectric Energy Demo donated by Educational Innovations. Deadline is January 3, 2019. Send your students’ solutions to: Chem 13 News, Elemental percentages puzzle, Department of Chemistry, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada; or email Kathy Jackson.
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0.0009% of the Earth’s crust
- 21% of the atmosphere
- 1.0% of the human body
- 87.5% of a pink compound in which Carl Mosander discovered this element in 1843
- 14.1% of tetrabutyl orthotitanate
- 1% of a μg of this radioisotope first identified in December 1952 was produced in 1961
- 51% of table sugar
- 31.4% of Freon (R-22)
- 75% of the sun
- 8.23% of the Earth’s crust
- 26.7% of rubbing alcohol
- 6.4% of argyrodite
- 15.7% of alanine
- 46.5% of fool’s gold
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