Introduction: The Ambit of Chemistry

Submitted by ChemPRIME Staff on Wed, 12/08/2010 - 23:27

Text below taken from Periodic Variation of Ionization Energy and Electron Affinity Lecture Demonstrations

Contents

Activities of Alkali Metals

Add small pieces of Li, K, Na to water, with universal indicatorA substance for which a physical property (such as color) changes abruptly when the equivalence point is reached in a titration. if desired, to show relative activities.

Hazards: K forms a peroxide coating that may explode when cut with a knife.


Activities of the Halogens[1][2][3][4]

Displace I, Br from NaI and NaBr solutions with Cl2 (extract halogens into nonpolarDescribes a molecule with no net permanent dipole; this can occur when there is no separation of centers of positive and negative electrical charge or because there are bond dipoles that cancel each others' effects. A polar molecule will assume certain orientations more than others in an electric field. solventThe substance to which a solute is added to make a solution. like hexane to make them more visible)[5].

Show that I2 does not displace Cl2 from NaCl, etc.

Reaction of Antimony with Halogens [6]

References

  1. Furse, A. J. Chem. Educ., 1947, 24 (9), p 445
  2. J. Chem. Educ., 1969, 46 (2), p A108
  3. Alyea, H. J. Chem. Educ., 1969, 46 (2), p A108
  4. J. Chem. Educ., 1933, 10 (10), p 637
  5. J. Chem. Educ., 1969, 46 (2), p A108
  6. J. Chem. Educ., 1969, 46 (2), p A108