What is a limiting reactant?

• the reactant that determines how much product can be made
• the reactant that is in excess
• the product that you can make the most of
• the amount of reactants that react with each other

Tags

NGSS.HS-PS1-7

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

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 16 moles of NH₃ and 30.0 moles of NO are combined?

4NH₃ + 6NO --> 5N₂ + 6H₂O

• NH₃

• NO

• N₂

• water

Tags

NGSS.HS-PS1-7

CH₄ + 2H₂O --> CO₂ + 4H₂

What is the limiting reactant when 20g CH₄ and 15g H₂O are combined? (CH₄ = 16.05 g/mol; H₂O = 18.02 g/mol)

• CH₄

• H₂O

• CO₂

• H₂

Tags

NGSS.HS-PS1-7

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 2 moles of chlorine are combined, identify the limiting reactant.

• AlCl₃

• Cl₂

• Al

Tags

NGSS.HS-PS1-7

P₄ + 3O₂ --> P₄O₆

What is the limiting reactant when 5 moles of P₄ and 15 moles of O₂ are combined?

• P₄

• O₂

• P₄O₆

• none of the above

Tags

NGSS.HS-PS1-7

Fe + S --> FeS

If 7.62g Fe and 8.67g S are combined, what is the limiting reactant? (Fe = 55.85 g/mol; S = 32.07 g/mol)

• Fe

• S

• FeS

• none

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

Tags

NGSS.HS-PS1-6

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation
• Panic
• Write an Unbalanced Equation
• Avogadro's Number

Tags

NGSS.HS-PS1-7