# 6.21.1: Lecture Demonstrations

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Add small pieces of Li, K, Na to water, with universal indicator 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 nonpolar solvent like hexane to make them more visible)[5].

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

## 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

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