Limiting Reactants & Calculating Excess Reactants


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What is a limiting reactant?

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1. Say you take a reactant A and calculate the amount of moles of another reactant B required to use up all of A. How do you know which of two reactants is the limiting one?

2. If 2.5 moles of zinc react with 6.0 moles of hydrochloric acid in the equation Zn + 2HCl = ZnCl2 + H2, what is the limiting reactant?

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About This Quiz & Worksheet

The quiz will test you on definitions and procedure. Some questions will also provide you with chemical reactions and the amount of each reactant. You will then need to correctly identify the limiting reactant.

Quiz & Worksheet Goals

The quiz will test you on these terms and concepts:

  • Limiting reactants
  • Reactants
  • Products
  • Determining limiting reactants

Skills Practiced

The quiz will help you practice the following skills:

  • Reading comprehension - ensure that you draw the most important information from the related limiting reactants lesson
  • Critical thinking - apply relevant concepts to examine information about chemical reactions in a different light
  • Problem solving - use acquired knowledge to solve limiting reactants practice problems
  • Interpreting information - verify that you can read information regarding chemical reactions and interpret it correctly

Additional Learning

Once you finish the quiz, make sure to peruse our related lesson titled Limiting Reactants & Calculating Excess Reactants. The lesson will help you cover the following topics:

  • Understanding real world chemical reactions
  • Defining the limiting and excess reactant
  • Describing how to determine the limiting reactant
  • Walking through several limiting reactant practice problems