Water Fog Lab

Good Essays
A Molecular Explanation of How the Fog Is Produced When Dry Ice Is Placed in Water
The primary purpose of the article is to correct a common misconception about the origin of the fog, in the Dry Ice in Water Fog (DIWF), and to give further insight into happenings on a molecular level in the (DIWF) with the aid of experimental evidence. The writer is keen on proving that the fog produced in the (DIWF) demonstration is actually from the bulk water onto which the dry ice is placed and not the atmospheric water vapor.

In a bid to understand the mechanism of the formation of fog, the writer employs a model, where the interaction of dry ice with other liquids is closely observed, and the effectiveness of experimental conditions in producing fog
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To prove this theory, the writers performed experiments where either the bulk liquid was monitored or the composition of the fog produced was tested. In the case of the (DIWF), the writer noticed that for a known volume of water and mass of dry ice, the volume of water always decreased after the all the dry ice sublimed. In the same vain, the writer experimented, using ethanol and glycerin at different times, and each time, obtaining a positive result.

The writers went on to note the effect of increasing the solution vapor pressure, citing that “Dropping dry ice into warmer liquids intuitively would be expected to produce a thicker fog, Since the vapor pressure (VP) of water increases with temperature” (Kuntzleman, 644). Also noted, are the limitations to the higher (VP)- thicker fog trend, giving the type of sublimation, and size of CO2 as possible explanation for the difference.

REFRENCES
Thomas S. Kuntzleman, Nathan Ford, Jin-Hwan No, and Mark E. Ott. “A Molecular Explanation of How the Fog Is Produced When Dry Ice Is Placed in Water”. Journal of Chemical Education. 92.(2014): 643-648. Web. 10 September 2016. https://uk.instructure.com/courses/1830098/files/85911532?module_item_id=22945280

QUESTION 2
The chemistry topic that interests me is
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The applications of catalysis, range from refineries to pharmaceuticals and cut across many other sectors in the industry. The writers state that “over 90% of all chemical products have at least one catalytic step in their manufacture” (de Vries 2009) so as emphasize the importance of catalysis.
Johannes G. de Vries and S. David Jackson, go on to list the procedure involved in the development of an industrial process. According to them, “very often a first phase is screening of catalysts, and for fine chemicals this is sometimes all that is needed” (de Vries 2009). Also highlighted was the fact, that while screening of catalyst is a big step, it “is very often at the beginning of a long journey. Particularly for bulk processes”.
Another factor to be considered, in the research and the development of an industrial process is the economic cost. The main purpose of research into catalysts is to increase the turnover numbers, and the writers give examples of how this can be

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