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Presentation transcript:

Limiting Reactants

n/reactants-products-and-leftovers

2 scoops ice cream + 1 squeeze chocolate syrup + 1 banana + 2 mounds of whip cream  1 banana split If we had 6 scoops ice cream, 3 squeezes chocolate syrup, 2 bananas, and 8 mounds whip cream, how many banana splits could you make?

Section 11-3 Why do reactions stop? Reactions proceed until one of the reactants is used up and one is left in excess. The limiting reactant limits the extent of the reaction and, thereby, determines the amount of product formed.limiting reactant **It is used up first!!!! The excess reactants are all the leftover unused reactants.excess reactants

Section 11-3 Why do reactions stop? (cont.) Determining the limiting reactant is important because the amount of the product formed depends on this reactant.

How to solve limiting reactant problems: KEY: If given two amounts of reactants, you need to determine which one is the limiting reactant KEY: If given two amounts of reactants, you need to determine which one is the limiting reactantSTEPS: Using the first amount given in the problem, calculate the amount of product formed.Using the first amount given in the problem, calculate the amount of product formed. Using the second amount given in the problem, calculate the amount of product formed.Using the second amount given in the problem, calculate the amount of product formed. Which ever gives the smallest amount of product formed shows the limiting reactant and is your answerWhich ever gives the smallest amount of product formed shows the limiting reactant and is your answer

Practice Problems #1 Determine the amount of Ag that forms when 3.5 g of Cu is reacted with 6.0 g of AgNO 3 Cu + 2AgNO 3  Cu(NO 3 ) 2 + 2Ag

Practice Problem #2 How many grams of NaCl will form from 1.7 g of Na and 2.6 L of Cl 2 ? 2Na + Cl 2  2NaCl

Section 11-3 A.A B.B C.C D.D Section 11.3 Assessment The mass of the final product in a chemical reaction is based on what? A.the amount of excess reactant B.the amount of limiting reactant C.the presence of a catalyst D.the amount of O 2 present

Section 11-3 A.A B.B C.C D.D Section 11.3 Assessment What is the excess reactant in the following reaction if you start with 50.0g of each reactant? P 4 (s) + 5O 2 (g) → P 4 O 10 (s) A.O 2 B.P 4 C.Both are equal. D.unable to determine

n/reactants-products-and-leftovers