Professional paper

https://doi.org/10.15255/KUI.2017.002

Chemistry in Teaching:
Common Sense Stoichiometry

Nenad Raos ; Institute for Medical Research and Occupational Health, Ksaverska c. 2, P.O.B. 291, 10 001 Zagreb, Croatia

Abstract

The teaching of stoichiometry is hampered by its “scholastic” nature, i.e. that the student is not familiar with the problems presented in the school. This paper provides a quite different approach, suggesting solving the problems much closer to everyday life. Examples of five such problems are presented: (1) control of CO₂ levels in submarines and space stations, (2) difference in oxygen consumption by burning of different kinds of natural gas, (3) justified difference in price of Na₂CO₃ and Na₂CO₃ · 10 H₂O, (4) calculation of the weight (and price) of bubbles in cheese, and (5) comparison in precision of two gravimetric methods for the determination of relative atomic mass. The general way of problem presentation enables their solution at different levels of complexity, i.e. their adaptation to the education level of students.




This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

chemistry education; stoichiometry; relative atomic mass; control of CO2 levels

Hrčak ID:

186985

URI

https://hrcak.srce.hr/186985

Publication date:

4.10.2017.

Article data in other languages: croatian

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