Limiting Reactants Quiz

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-PS1-6

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? **convert moles of each reactant to moles of H₂O and compare your two answers.

SHOW YOUR WORK

C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• O₂

• C₁₀H₈

• H₂O

• CO₂

• 1.16%

• 116%

• 85%

• 76%

4NH₃ + 5O₂ --> 4NO + 6H₂O

How many grams of NO are formed if 6.30g of NH₃ react with 1.80g of O₂? What is the limiting reactant? SHOW YOUR WORK.

Molar Masses:

NH₃=17g/mol; O₂=32g/mol;

NO = 30g/mol; H₂O=18g/mol

• 11.1g NO; O₂ is the limiting reactant

• 1.35g NO; NH₃ is the limiting reactant

• 1.35g NO; O₂ is the limiting reactant

• 11.1g NO; NH₃ is the limiting reactant

In the image, which substance is limiting reactant?

• The white molecules, because there are excess

• The black atoms, because they all reacted.

• The white molecules, because they all reacted.

• The black atoms, because there are excess.

When does a chemical reaction stop?

• When the excess reactant is used up
• When the limiting reactant completely reacts.

• Chemical reactions never stop