What minimum frequency of light is required to ionize potassium?The energy required to ionize potassium is 419kJ/mol? Chemistry The photoelectric work function of a metal is the minimum energy needed to eject an electron by irradiating the metal with light. For calcium, this work function equals 4.34 x 10-19 J.
This video shows how to remove black mastic or carpet glue of concrete floor using FranMar's Bean-e-doo mastic remover. This is an easy and safe way to remove black mastic without toxic fumes. for more information visit www.sealgreen.com.1  Howto & Style. 2  Standard YouTube License.his video shows how to remove black mastic or carpet glue of concrete floor using FranMar's Bean-e-doo mastic remover. This is an easy and safe way to remove black mastic without toxic fumes. for more information visit www.sealgreen.com. 1  Howto & Style. 2  Standard YouTube License.
Patch or grind any damaged areas or rough spots on the path. Clean the concrete with trisodium phosphate to remove dirt, grease and any moss or mildew. Etch the concrete pathway with a commercial acid designed for etching concrete, such as phosphoric acid, following the manufacturer's instructions closely.Rinse the path well to remove all traces of the etching solution. Let the concrete dry completely before painting.tch the concrete pathway with a commercial acid designed for etching concrete, such as phosphoric acid, following the manufacturer's instructions closely. Rinse the path well to remove all traces of the etching solution. Let the concrete dry completely before painting.