ok so to begin,
by examining the change in amount of substance at a particular time or over a period of time, the rate of reaction can be determined. The representation of such a reaction may be seen as the following once recorded onto a graph:
In order to calculate the rate we would use the formula:
RATE =
(final concentration of A) - (initial concentration A)
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final time - initial time
- OR -
RATE = [A]final - [A]initial
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[t]final - [t]initial
INSTANTANEOUS RATE: of a reaction at a specific time is determined by calculating the slope of the line tangent to the point on the concentration vs time curve.
We also learned two types of reactions, exothermic and endothermic.
EXOTHERMIC: the product possess less energy than the reactants, during the reaction heat is lost from the system and (delta)H is a negative value.
ENDOTHERMIC: the product possess more potential evergy than the reactants, this energy is absorbed from it's surroundings, increasing the system's energy content, giving a positive (delta)H value.
ok so thats pretty much what we have been duscussing, on monday Mrs. Kozoriz, wasn't there but the sub gave two worksheets one we finished in class (reaction rate 52; CHANGE IN H2O0 WITH TIME) and one we had to work on for the rest of the class (reaction rate 17; A model for reaction rates).
THE NEXT SCRIBE WILL BE........... hm........ lucky : *****Niwatori-san******
