Limiting Reactant CFU

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

What does a limiting reactant determine?

• How much product can actually be made

• Which reactant will have excess

• The maximum theoretical product that can be made

• How much excess reactant gets used

When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

How do we decide which is the limiting reactant?

• The reactant which gives the most grams of product

• The reactant which gives the least grams of product

• The most product produced

• The least product produced

In the image, which reactant is limiting?

• The white molecules, because there are extra.

• The black atoms, because they are completely used up.

• The white molecules, because they are completely used up.

• The black atoms, because there are extra.

In a balanced equation, the ratio between the coefficient of any two substances is called the _______.

• mole ratio

• stoichiometry

• limiting reactant

• excess reactant

Place the steps of determining limiting reactant in order.

• Find the lower answer

• Write down the reactant which gave the lower answer as the limiting reactant

• Find the product to convert both into

• Write both given grams of reactant

• set up and calculate two gram to gram conversions

This is what you call a reactant that you have enough of. The one that DOES NOT run out.

• Limiting Reactant

• Excess Reactant

• Highly Reactant

• Super Reactant

What is a Excess Reactant?

• The amount of product made

• The reactant which runs out first

• The reactant that remains after the reaction stops

• How much reactant you start with.

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

• bread
• jelly
• peanut butter
• sandwich