Limiting Reactants and Percent Yield

If a chemical reaction involving substance A and B stops when substance B is completely used up, then substance B is referred to as the

• excess reactant.

• limiting reactant.

• primary reactant.

• primary product.

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NGSS.HS-PS1-7

Given the pictured equation, how may moles of hydrogen gas (H2) would be produced from 1.00 mole of Zinc (Zn) if there was a 85.0% yield?

• .850 mole

• .750 mole

• 1.00 mole

• There is no way to determine this answer.

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NGSS.HS-PS1-7

Which is true of the reaction shown below?

• Two molecules of Substance Y will be left over when this reaction goes to completion.

• Substance Y is the limiting reagent in this reaction.

• The addition of more molecules of Substance X will not affect the amount of Substance Z that can be made.

• The mole ratio of this reaction is 6:5:6.

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NGSS.HS-PS1-7

In most chemical reactions the amount of product obtained is

• more than the theoretical yield.

• equal to the theoretical yield.

• more than the percent yield.

• less than the theoretical yield.

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NGSS.HS-PS1-7

Which of the following cannot be determined from the pictured equation?

• Moles of a product produced from a given amount of reactant.

• Mass of a product produced from a given amount of reactant.

• Number of atoms or molecules produced from a given amount of reactant.

• The volume of a liquid produced from a given amount of reactant

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NGSS.HS-PS1-7

2 : 3

1 : 2

1 : 1

1 : 3

• 2 : 3

• 1 : 2

• 1 : 1

• 1 : 3

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NGSS.HS-PS1-7

A reactant that is totally consumed during a chemical reaction, limits the extent of the reaction, and determines the amount of product

• stoichiometry

• mole ratio

• excess reactant

• limiting reactant
  

How do you determine the limiting reactant?

• Find the amount of product produced by each amount of reactant. The reactant that makes the most is the limiting reactant.

• Find the amount of product produced by each amount of reactant. The reactant that makes the least is the limiting reactant.

• The reactant with the least amount of mass (grams) present is the limiting reactant.

• Cannot be determined.

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NGSS.HS-PS1-7

Body + 4 Tires --> 1 car
How many cars can you make with 92 tires and 34 bodies? 
In this senario the tires would be the _____________  reactant. 

• Limiting 

• Excess 

In a reaction between 5 moles of hydrogen gas and 3 moles of oxygen gas to form water, which is the limiting reactant?

• Hydrogen gas

• Oxygen gas

• Water

• None

Tags

NGSS.HS-PS1-7