Tuesday, January 18, 2011

UNIT 3

(January 18, 2011). http://nzic.org.nz/ChemProcesses/food/6D.pdf

This pdf document outlines all the chemical processes that occurs during baking. This relates to the unit, "quantities in chemical reactions." The big ideas within the unit that this document covers are relationships in chemical reactions can be described quantitatively and the efficiency of chemical reactions can be determined and optimized by applying an understanding of quantitative relationships in such reactions.

The amount of concerns and chemical reactions that occur during baking are tremendous and must be taken into account, otherwise a cake can become soggy and wet. Certain ratios have been invented to take this into account and to ensure a complete and tasteful final product is met. one good proportion that is used within baking a rising flour is one teaspoon of baking powder for every one cup of flour. Without this ratio, with a lot of baking powder, the cake would turn out disfigured and with too much flour, the cake would not rise at all. The overall size of the cake should be taken into account as well, since your ingredients determine everything.

Some chemical equations are listed within the document. The main equations are for baking soda and baking powder. Baking soda creates a strong base and as a result baking powder is used more often. Baking soda revolves on the release of CO2 and the equation is: 2NaHCO3 -> Na2CO3 + CO2 + H2O. Baking powder is baking soda with acid added in it already. Because of the neutralization, more CO2 is produced and the equation is: NaHCO3 + H(^+) -> Na(^+) + H2O + CO2.

Baking can be applied to the elements that were taught to us in this unit of grade 11 chemistry. different proportions of a chemical equation can effect the total outcome of the final product. This is why the mole ratio was founded. This allows us to figure out the limiting reagents and excess reagents. The limiting reagents allow us to figure out how much of the final product will be produced and how much chemicals we will obtain in excess. In baking, there is no limiting reagent or excess agent as all the ingredients are needed to create a final product whether that products turns out good or bad.

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