Excess Reactant

When does a reaction stop?

• When it wants to

• When both the limiting and excess reactants are gone

• When all the excess reactant has been consumed

• When all the limiting reactant has been consumed

This is what you call a reactant that you have plenty of. The one that DOES NOT run out.

• Limiting Reactant

• Excess Reactant

• Highly Reactant

• Super Reactant

What is an excess reactant in a chemical reaction?

• A reactant that is completely consumed in the reaction

• A reactant that remains after the reaction is complete

• A reactant that limits the amount of product formed

• A reactant that speeds up the reaction

In a reaction between hydrogen and oxygen to form water, if you have 10 moles of hydrogen and 5 moles of oxygen, which is the excess reactant?

• Hydrogen

• Oxygen

• Water

• None

Tags

NGSS.HS-PS1-7

Why is it important to identify the excess reactant in a chemical reaction?

• To determine the theoretical yield of the product

• To calculate the reaction rate

• To identify the catalyst

• To balance the chemical equation

Tags

NGSS.HS-PS1-7

• None

What happens to the excess reactant after a chemical reaction is complete?

• It is completely used up

• It remains unreacted

• It forms a new product

• It becomes a catalyst

In a laboratory experiment, you mix 3 moles of sodium with 2 moles of chlorine gas. Which is the excess reactant?

• Sodium

• Chlorine gas

• Sodium chloride

• None

How can the presence of an excess reactant affect the cost of a chemical process?

• It increases the cost due to waste

• It decreases the cost by speeding up the reaction

• It has no effect on cost

• It reduces the cost by increasing yield

Tags

NGSS.HS-PS1-6