What is used up in and stops a chemical reaction? percent yield limiting reactant theoretical yield excess reactank

## Step 1<br />In a chemical reaction, the reactants are the substances that undergo a chemical change to form a product. The reactants are consumed during the reaction.<br /><br />## Step 2<br />The reactant that is completely consumed in a chemical reaction is known as the limiting reactant. This is because the amount of product formed in a chemical reaction is determined by the amount of the limiting reactant.<br /><br />## Step 3<br />Once the limiting reactant is completely consumed, the reaction stops. This is because there is no more of this reactant to continue the reaction.