. A model differential equation for chemical reaction dynamics is given as kC x C D x C u t C −   =   +   2 2 where u is the velocity, D is the diffusion coefficient, k is a reaction rate, and C is the (dimensionless) concentration of a given chemical species.

(a) Determine the appropriate dimensions of D and k.

(b) Using a characteristic length scale L and average velocity V as parameters, rewrite this equation in dimensionless form and comment on any non-dimensional group appearing.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

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