CHEM.8.A

Previous Next
The student is expected to define mole and apply the concept of molar mass to convert between moles and grams;
1666 TEKS header image

Knowledge and Skills Statement

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

any material that has a definite chemical composition

the measure of the amount of matter in a substance

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

the mass in grams of one mole of the element or compound

Research

Aronson, Jeff. "Mass and Masses...When I Use a Word." British Medical Journal 324, no. 7352 (2002): 1521. 
https://doi.org/10.1136/bmj.324.7352.1521

Summary:  This article describes the different ways that medical professionals prefer to report drug concentrations. Toxicologists prefer mass units. Pharmacologists generally prefer molar units. Immunologists often talk in mass units. Homoeopaths, on the other hand, talk in dilutions, not units of any sort.

Research

Wagner, Eugene P. "A Study Comparing the Efficacy of a Mole Ratio Flow Chart to Dimensional Analysis for Teaching Reaction Stoichiometry." School Science and Mathematics 101, no. 1 (2001):10-22. doi:10.1111/j.1949-8594.2001.tb18185.x.

Summary:  Stoichiometry has long been a nemesis of students in general chemistry. Described here is a proportional reasoning methodology called the Mole Ratio Flow Chart (MRFC) that has been developed and used over the past 2 years in the investigator's general chemistry courses. A study was conducted in the spring 1999 and fall 1999 semesters in the Chemistry 1251 course to determine the relative efficacy of the MRFC compared to dimensional analysis for student performance and understanding of reaction stoichiometry.