<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-893X</journal-id>
<journal-title><![CDATA[Educación química]]></journal-title>
<abbrev-journal-title><![CDATA[Educ. quím]]></abbrev-journal-title>
<issn>0187-893X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Química]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-893X2024000100111</article-id>
<article-id pub-id-type="doi">10.22201/fq.18708404e.2024.1.86324</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Determination of chemical composition in Tri-Metal Alloys: a three variable linear equation system approach]]></article-title>
<article-title xml:lang="es"><![CDATA[Determinación no destructiva de composición química en aleaciones de tres metales: aproxi- mación de sistema de ecuaciones lineales en tres variables]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Van-Sertima]]></surname>
<given-names><![CDATA[Ariel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Simmons]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zablah-Vasquez]]></surname>
<given-names><![CDATA[Raul]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalta-Cerdas]]></surname>
<given-names><![CDATA[Adrian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Sam Houston State  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>111</fpage>
<lpage>126</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-893X2024000100111&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-893X2024000100111&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-893X2024000100111&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract To enhance the bridge between macroscopic and symbolic representations in chemistry, we crafted a laboratory module focusing on a three-equation system for chemical composition analysis. Students assess the composition of copper, tin, and aluminum alloys by measuring two properties: density and heat capacity. These non-destructive procedures fit within standard laboratory session durations. After gathering data, students tackle three linear equations linking element mass ratio to alloy composition, density, and heat capacity. By pooling data from various samples, the class achieves a comprehensive understanding. This method aligns with objectives for laboratory education, emphasizing scientific reasoning, practical skills, and subject mastery. Students&#8217; results deviated by +/-10% from actual alloy compositions. The discussion of student-gathered data and results supports the feasibility of the laboratory experience for its implementation in introductory chemistry laboratories.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para mejorar el puente entre las representaciones macroscópica y simbólica utilizadas en química, diseñamos un módulo de laboratorio centrado en un sistema de tres ecuaciones para el análisis de la composición química. Los estudiantes evalúan la composición de aleaciones de cobre, estaño y aluminio midiendo dos propiedades: densidad y capacidad calorífica. Estos procedimientos no destructivos se ajustan a las duraciones estándar de las sesiones de laboratorio. Tras recopilar datos, los estudiantes abordan tres ecuaciones lineales que vinculan el porcentaje en masa del elemento con la composición de la aleación, la densidad y la capacidad calorífica. Al agrupar datos de diversas muestras, la clase logra una comprensión integral. Este método se alinea con objetivos para la educación en laboratorios, enfatizando el razonamiento científico, habilidades prácticas y dominio del tema. Los resultados de los estudiantes se desviaron en un +/-10% de las composiciones reales de las aleaciones. La discusión sobre los datos recopilados por los estudiantes y los resultados respalda la viabilidad de la experiencia de laboratorio para su implementación en laboratorios introductorios de química.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Density]]></kwd>
<kwd lng="en"><![CDATA[heat capacity]]></kwd>
<kwd lng="en"><![CDATA[calorimetry]]></kwd>
<kwd lng="en"><![CDATA[alloys]]></kwd>
<kwd lng="en"><![CDATA[chemical composition]]></kwd>
<kwd lng="en"><![CDATA[linear equations]]></kwd>
<kwd lng="es"><![CDATA[Densidad]]></kwd>
<kwd lng="es"><![CDATA[capacidad calórica]]></kwd>
<kwd lng="es"><![CDATA[calorimetría]]></kwd>
<kwd lng="es"><![CDATA[aleaciones]]></kwd>
<kwd lng="es"><![CDATA[composición química]]></kwd>
<kwd lng="es"><![CDATA[ecuaciones lineales]]></kwd>
</kwd-group>
</article-meta>
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