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-PS1-7

When 6 moles of O₂ reacts with 2 moles of H₂ what is the limiting reactant? 2 H₂ + 6 O₂ --> 2 H₂O

• Oxygen

• H₂

• Water

Tags

NGSS.HS-PS1-7

What are the correct steps for determining the limiting reactant?

• divide each reactant by its molar mass and look for the smallest number

• balance the chemical equation and look for the smallest coefficient

• divide the moles of each reactant by its coefficient and look for the smallest number

• divide each reactant by Avogadro's number and look for the smallest number

When the limiting reactant is used up, what happens?

• the reaction speeds up

• the reaction slows down

• the reaction moves to its 2nd stage

• the reaction stops

Which reactant is the limiting reagent and why?

• Hydrogen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

• Oxygen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which reactant is the limiting reagent and why?

• Hydrogen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

• Oxygen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?  
1 C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen

• C₁₀H₈

• Water

• Carbon Dioxide

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 10 moles of NH₃  react  with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• NH₃

• NO

• N₂

• water

Tags

NGSS.HS-PS1-7

• None, they are in perfect stoichiometric ratio

Tags

NGSS.HS-PS1-7