8. Challenge Questions Units are very important in calculations; using wrong uni

Question

8. Challenge Questions Units are very important in calculations; using wrong units can sometimes have fatal consequences. Dimensional Analysis is a method you would use to determine the units ofa chemical reaction; it is really the algebraic manipulation of all the units of an equation. For example, speed is the distance something travels over a certain amount of time Distance Speed -Time If the distance is measured in meters (m) and the time is seconds (s) what do you expect the units for speed to be? a) b) Given the equation for speed, explain why your answer to part a) makes sense. Chemical reactions take place all the time. In General Chemistry lI, you will study these reactions and use your knowledge of logarithms to learn about different characteristics of a reaction. One of these is the Activation Energy of a chemical reaction. It is the minimum amount of energy need for a chemical reaction to occur. In order to find this value, a chemist will measure the reaction rate of a chemical at one temperature and compare it to the reaction rate of the same chemical at a different temperature. The relationship between the reaction rates, temperatures, and the Activation Energy is given by the logarithmic equation In the equation above, . ki and k2 are the reaction rate constants measured at the two temperatures T, and T respectively. (The unit for temperature is measured in Kelvin, K. .R is the universal gas conant 8.14 . E,is the Activation Energy that is given or what we are looking for. It has the us Toules molKelvin mol

Explanation / Answer

a)

unit of speed would be m/s or meter per second

b)

speed = distance/time

the speed of an object which travels 1 m in 1 sec would be

speed = (1 m)/ (1 sec) = 1 m/sec

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