Limiting reactant

• Ever notice how hot dogs are sold in packages of 10 while the buns come in packages of 8?? • The buns limit the hot dog production to 8! • In chemistry, we would call the buns the LIMITING REACTANT. Our

equation would look like this:

phet simulation

Which is the limiting reactant, red or green?

http://www.mhhe.com/physsci/chemistry/chang7/esp/folder_structure/cr/m2/s3/

If red is “A” and green is “B”, write the balanced chemical equation that represents the reaction?

http://www.mhhe.com/physsci/chemistry/chang7/esp/folder_structure/cr/m2/s3/

Which is the limiting reactant?

OxygenHydrogen

http://wps.prenhall.com/wps/media/objects/165/169519/blb9ch0307.html

Write the balanced chemical equation that represents the reaction.

OxygenHydrogen

http://wps.prenhall.com/wps/media/objects/165/169519/blb9ch0307.html

When looking at a particle diagram, how can you determine which reactant is the limiting reactant?

phet simulation

• Limiting reactant – Any reactant that is used up first in a chemical reaction; it determines the amount of product (theoretical yield) that can be formed in the reaction.

• Excess reactant – A reactant present in a quantity that is more than sufficient to react with a limiting reactant; any reactant the remains after the limiting reactant is used up in a chemical reaction.

I have unlimited amounts of everything except butter. I only have 4 sticks of butter.

How many dozen cookies can I make?

I have:

9 cups of flourA box of baking sodaA carton of salt10 sticks of butterA 5 lb. bag of sugarA 2 lb. bag of light brown sugarA bottle of vanilla extract4 eggs6 bags of chocolate chips

How many dozen cookies can I make?What will I run out of first? How much extra butter will I have?

When looking at a recipe, how can you determine which ingredient will limit your amount of product?

Limiting Reactant Calculations (9:03)Calculate the amount of product (if more than one product, pick one) that can be produced by the available amount of each reactant.

The reactant that gives you LESS product is the LIMITING reactant.

Limiting Reactant CalculationsJohn has 100.0 grams of each reactant available. Determine which reactant is the limiting reactant. How much aluminum is produced?

3 Ca + 2 AlBr3 3 CaBr2 + 2 Al

Limiting Reactant Practice39.5 grams of zinc are reacted with 42.6 grams of hydrochloric acid. Which is the limiting reactant? How much hydrogen gas is produced?

Zn + 2HCl ZnCl2 + H2