Accompanying Lesson Plan: Lesson 6.2: Controlling the Amount of Products in a Chemical Reaction Adding more of one reactant will make more products as long as there is still enough of the other ...

It is the limiting reactant. Now use the moles of the limiting reactant to calculate the mass of the product. Remember to use the molar ratio between the limiting reactant and the product.

Enzymes lower the activation energy necessary to transform a reactant into a product. On the left is a reaction that is not catalyzed by an enzyme (red), and on the right is one that is (green).

For example, some reactants can be very expensive so the experiment may be scaled down, usually one reactant is in excess or perhaps the chemist knows approximately how much product they need.