CHEM.9.D

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The student is expected to describe the concept of limiting reactants in a balanced chemical equation.
1666 TEKS header image

Knowledge and Skills Statement

Science concepts. The student understands how matter is accounted for in chemical reaction.

describes a chemical reaction and includes all of the reactants and all of the products of the reaction

a chemical change that occurs when two or more substances combine to form a new substance; the rearrangement of atoms to produce new compounds

substance that occupies space, has mass, and is composed of microscopic particles
 

Research

Edelsztein, Valeria. "An Experimental Approach with a Twist: Helping High School Students to Understand the Concept of Limiting Reactant." Journal of Chemical Education 100, no 4, (2023):1505-1510. https://doi.org/10.1021/acs.jchemed.2c00986

Summary:  High school students and students in the first years of college have difficulties understanding stoichiometry and, in particular, the concept of a limiting reactant. Proposals aimed at overcoming these learning obstacles tend to focus on analogies, and few sequences approach teaching from an experimental perspective. In this article, an experimental activity was designed to introduce the concept of a limiting reactant with nonhazardous, inexpensive, and readily available materials in combination with an innovative visual and graphic representational approach.

Research

Walker, Joi Phelps, Victor Sampson, Carol O. Zimmerman, and Jonathon A. Grooms. "A Performance-Based Assessment for Limiting Reactants." Journal of Chemical Education 88, no. 9 (2011): 1243-1246. https://doi.org/10.1021/ed1006629

Summary:  Educators are increasingly being called upon to provide evidence of student learning. Traditional assessments are not always the best venue for demonstrating conceptual understanding, particularly in science. This paper presents details on the design, use, and scoring of a performance-based assessment for measuring student understanding of limiting reactants. The authors encountered a variety of challenges in the process of designing the performance-based assessment; these are described as well.