Answer:
Using 1.0 gram of iron oxide.
Explanation:
- Rate of the reaction depends on many factors:
The concentration of the reactants.
The surface area of the reactants or catalyst.
The amount of the catalyst.
Hydrogen peroxide is the reactant and iron (III) oxide is the catalyst.
- If we display the various choices:
<em>Replacing the powdered iron oxide with its cubical crystals:</em>
This will decrease the surface area of the catalyst exposed to the solution, so the rate formation of the products will decrease.
<em>Using 150 cm³ of hydrogen peroxide:</em>
The volume of the reactant does not affect the concentration of the reactants, so changing the volume has no effect on the rate formation of the products.
<em>Removing iron oxide from the reaction mixture:</em>
Removing the catalyst will decrease (may stop) the rate formation of the products.
<em>Using 1.0 gram of iron oxide:</em>
This will increase the amount of the catalyst used, and so it will increase the rate formation of the products.
So, the right choice is:
the rate formation of the products
