Monday, April 18, 2011

IB Chemistry and IB Biology on Kinetics and Rate of reaction for IA

Kinetics is appropriate for Complete Design for IB Chem IA.
Research Question for kinetics must have the 4 criteria to score a complete
  • IV and DV 
  • Well defined
  • Measureable
  • Focus
How will changing concentration of HCI affect the rate of reaction in a reaction between HCI and magnesium ribbon? (  partial because it is not well defined and focus )

How will changing concentration of HCI affect the pressure change due to release of hydrogen gas measured using a pressure sensor in a reaction between hydrocloric acid and magnesium ribbon ?
 (Complete )

How will changing concentration of thiosulphate affect the rate of sulfur formation in a reaction between sodium thiosulphate and hydrochloric acid ( is only Partial )

How will changing concentration of thiosulphate affect the rate of disappearance of cross X due to formation of sulphur in a reaction between sodium thiosulphate and hydrochloric acid 
(Complete )


Using ICT  Vernier Lab Pro for Quantification.


How will changing concentration of thiosulphate affect the change in light intensity due to formation of sulphur measured using a light sensor in a reaction between sodium thiosulphate and hydrochloric acid (Complete)

How will changing concentration of potassium iodide affect the change in absorbance/ transmittance due to formation of blue black colouration measured using a visible spec in an iodine clock reaction ( potassium iodide with H2O2 ) is a ( Complete )


Iodine Clock reaction is a very good experiment for Chem IA
Reagent used are H2O2, KI, S2O3, starch, and stop watch or visible spectrophotometer

Below are 2 good samples of IA on iodine clock reaction measured using stop watch
A better way to quantify is to use ICT visible spectrophotometer not a stopwatch. 
See slideshare for sample.



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