#10C Stoichiometry w/ Equations: Limiting Reactant

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

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

A propane grill on a backyard patio is left burning for too long and eventually goes out. Which of the following chemicals is the limiting reagent?

• oxygen gas

• propane

• carbon dioxide

• water vapor

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

Use the equation 2 Al + 3 Cl₂ → 2 AlCl₃. If 2 moles of aluminum and 4 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3

• Cl2

• Al

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

• AlCl3

• Cl2

• Al

CH₄ + 2H₂O → CO₂ + 4H₂

What is the limiting reactant when 2g CH₄ react with 15g H₂O?

• CH₄

• H₂O

• CO₂

• H₂

CH₄ + 2H₂O → CO₂ + 4H₂

What is the limiting reactant when 20g CH₄ react with 15g H₂O?

• CH₄

• H₂O

• CO₂

• H₂

When reacting Na with Cl₂, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield?

• 100%

• 104%

• 96%

• 1.04

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

• 1.16%
• 116%
• 85%
• 76%

Tags

NGSS.HS-PS1-7