Just Breathe

• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 78, Nº 4, 2001, pág. 512
• Idioma: inglés
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• Resumen

  • In this Activity, students place steel wool in a test tube that is then inverted in a beaker of water. Oxygen in the air trapped in the test tube reacts with iron to form rust, and the water level rises inside the test tube. Within 30-45 minutes, the majority of oxygen is consumed. By measuring the overall height of the test tube and the final height of the water in the test tube, students can arrive at a reasonably good estimate of the percent oxygen (volume) in the original air sample.