# Problem: The scenes depict four initial reaction mixtures for the reaction of A (blue) and B (yellow), with and without a solid present (gray cubes). The initial rate, –d[A]/dt (in mol/L·s), is shown, with each sphere representing 0.010 mol and the container volume at 0.50 L.Do the gray cubes have a catalytic effect? Explain.

###### FREE Expert Solution

We’re being asked to determine if the gray cubes have a catalytic effect.

We're given the initial rates and the amount of reactant in each reaction.

Rate is equal to:

$\overline{){\mathbf{rate}}{\mathbf{=}}{\mathbf{-}}\frac{\mathbf{∆}\mathbf{\left[}\mathbf{A}\mathbf{\right]}}{\mathbf{∆}\mathbf{t}}}$

We have to compare the time for each reaction. First, let's calculate the initial amount of A and B in each mixture:

$\overline{){\mathbf{molarity}}{\mathbf{\left(}}{\mathbf{M}}{\mathbf{\right)}}{\mathbf{=}}\frac{\mathbf{mol}}{\mathbf{L}}}$

Mixture I:

molarity A = 0.1 M

molarity B = 0.1 M

Mixture II:

molarity A = 0.16 M

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###### Problem Details

The scenes depict four initial reaction mixtures for the reaction of A (blue) and B (yellow), with and without a solid present (gray cubes). The initial rate, –d[A]/dt (in mol/L·s), is shown, with each sphere representing 0.010 mol and the container volume at 0.50 L.

Do the gray cubes have a catalytic effect? Explain.