Conceptual Limiting Reactants

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

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

Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?

• 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

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.HS-PS1-7

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.HS-PS1-2

NGSS.HS-PS1-7

The excess reactant

• .
• is used up first
• is the reactant that is left over
• .

The limiting reactant . . .

• slows the reaction down.

• is used up first.

• is the reactant that is left over.

• controls the speed of the reaction.

The limiting reactant

• slows the reaction down

• is used up first

• is the reactant that is left over

• controls the speed of the reaction

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

Tags

NGSS.HS-PS1-7