Limited Excess

A chemical reaction involving substances A and B stops when B is completely used.  B is the

• excess reactant

• primary reactant

• limiting reactant

• primary product

A reactant that remains after a chemical reaction stops

• stoichiometry

• mole ratio

• excess reactant

• limiting reactant

To determine the limiting reactant in a chemical reaction, one must know the

• amount of product formed

• available amount of one of the reactants

• available amount of each of each reactant

• speed of the reaction

P₄ + 3O₂ --> P₄O₆ 
What is the limiting reactant is 12 moles of P₄ react with 15 moles of O₂?

• P₄

• O₂

• P₄O₆ 

• none of the above

In a chemical reaction, the reactant that determines the amount of product formed is called the

• excess reactant

• primary reactant

• limiting reactant

• catalyst

When a reaction stops because one reactant is used up, the remaining reactant is called the

• stoichiometric reactant

• excess reactant

• limiting reactant

• primary reactant

• None

Which of the following is true about the excess reactant in a chemical reaction?

• It is completely consumed

• It determines the amount of product

• It remains after the reaction

• It speeds up the reaction

In a chemical reaction, if the amount of product formed is less than expected, it is likely due to the

• excess reactant

• limiting reactant

• catalyst

• temperature

The concept of limiting and excess reactants is crucial in which of the following fields?

• Astronomy

• Stoichiometry

• Geology

• Meteorology