Limiting and excess Reactant

The limiting reactant

• is the reactant that is left over

• is the reactant used up first

A limiting reactant is a reactant that.....

• runs out during a chemical reaction

• causes a reaction to stop

• determines the amount of products that can be made

• all of these

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 3 moles of chlorine are reacted, how much AlCl₃ can be made?

• 1 mole

• 2 moles

• 4 moles

• 0 moles

Tags

NGSS.HS-PS1-7

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 4 moles of aluminum and 6 moles of chlorine are reacted, identify the how many moles of AlCl₃ are produced.

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

P₄ + 3O₂ --> P₄O₆  What is the limiting reactant if 1 mole of P₄ react with 6 moles of O₂?

• P₄

• O₂

• P₄O₆ 

• none of the above

P₄ + 3O₂ --> P₄O₆

How many moles of P₄O₆ can be produced if 3 moles of P₄ react with 6 moles of O₂?

• 1 mole

• 2 moles

• 4 moles

• 0 moles

Tags

NGSS.HS-PS1-7

How much water can be made if 8 moles of NH₃ react with 12 moles of NO?

4NH₃+6NO --> 5N₂ + 6H₂O

• 5 moles

• 6 moles

• 12 moles

• 18 moles

Tags

NGSS.HS-PS1-7

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

The diagram below represents H₂ and Cl₂ molecules that will potentially react to form HCl.

H₂ + Cl₂ --> 2HCl

Which of the following best describes this reaction?

• The limiting reactant is chlorine.

• The limiting reactant is hydrogen.

• Hydrogen and chlorine are nonreactive.

• All molecules shown will react to form the product. 

Tags

NGSS.HS-PS1-2

In this image, the information in red is called the_______.

• Product

• Reactant

• Chemical Subscript

• Yield

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5