This title slide, named "Descomposición Térmica," introduces a lesson on thermal decomposition. Its main text reads "Lección de Descomposición Térmica," with the subtitle "Exploramos cómo el calor descompone compuestos," exploring how heat breaks down compounds.

Lección de Descomposición Térmica

Exploramos cómo el calor descompone compuestos

Source: Y8 AQA Activate Chemistry Lesson

This slide presents the agenda for a lesson on thermal decomposition, beginning with its definition and key characteristics. It then covers common examples, chemical equations, safe lab experiments, and real-world applications with a summary.

Agenda de la Lección

1. ¿Qué es la descomposición térmica?

Definición y características principales del proceso.

2. Ejemplos comunes

Materiales y sustancias que se descomponen con calor.

3. Ecuaciones químicas

Fórmulas balanceadas de reacciones típicas.

4. Experimentos prácticos

Demostraciones seguras en el laboratorio escolar.

5. Aplicaciones y resumen

Usos reales en la industria y revisión clave. Source: y8 aqa activate powerpoint lesson on thermal decomposition

Thermal decomposition is the breakdown of a compound due to heat, shown by the general equation AB → A + B. It requires high temperatures and is common in metal carbonates and hydroxides.

¿Qué es la Descomposición Térmica?

• Descomposición de un compuesto por efecto del calor.
• Ecuación general: AB → A + B.
• Requiere altas temperaturas.
• Común en carbonatos e hidróxidos metálicos.

Source: y8 aqa activate powerpoint lesson on thermal decomposition

The slide visually demonstrates the strong heating of calcium carbonate (CaCO₃), which decomposes into calcium oxide (CaO) and carbon dioxide (CO₂). The equation shown is CaCO₃ → CaO + CO₂, with CO₂ gas bubbles released in a lab setting.

Ejemplo Visual

!Image

• Calcium carbonate (CaCO₃) heated strongly.
• Decomposes to calcium oxide (CaO) + CO₂.
• Equation: CaCO₃ → CaO + CO₂.
• CO₂ gas bubbles released in lab.

Source: Wikipedia

The slide "Ejemplos Comunes" lists common thermal decomposition reactions. It features CaCO₃ → CaO + CO₂ (limestone), CuCO₃ → CuO + CO₂ (green to black), and 2HgO → 2Hg + O₂ (mercury oxide).

Ejemplos Comunes

• CaCO₃ → CaO + CO₂ (caliza)
• CuCO₃ → CuO + CO₂ (verde a negro)
• 2HgO → 2Hg + O₂ (óxido de mercurio)

Source: Y8 AQA Activate PowerPoint Lesson on Thermal Decomposition

The slide presents the balanced decomposition of CaCO₃ into CaO and CO₂, with 1 Ca, 1 C, and 3 O atoms on both sides, as a typical carbonate reaction. On the right, it contrasts an unbalanced proposal for Cu(OH)₂ decomposition with the correct version (2Cu(OH)₂ → 2CuO + 2H₂O), noting the blue solid turns black with water vapor.

Ecuaciones Balanceadas

| CaCO₃ → CaO + CO₂

Ecuación perfectamente balanceada:

• 1 Ca
• 1 C
• 3 O

en ambos lados del →. Reacción típica de carbonatos. | Propuesta: 2Cu(OH)₂ → 2CuO + H₂O + ½O₂

¡No balanceada! (4H izq., 2H der.)

Correcta: 2Cu(OH)₂ → 2CuO + 2H₂O Observaciones: Sólido azul → negro + vapor de agua. |

Source: Y8 AQA Activate - Thermal Decomposition

The slide "Datos Clave" highlights key stats on CaCO₃ decomposition at 800-900°C. It produces 44 g of CO₂ per 100 g of CaCO₃, equating to 44% of its mass.

Datos Clave

• 800-900°C: Temperatura de descomposición

para CaCO₃

• 44 g: CO₂ producido

por 100 g CaCO₃

• 44%: Masa de CO₂

respecto a CaCO₃

The slide, titled "Cita Educativa," features a quote from Prof. Ana Morales, Doctora en Química Educativa. It states that heat, like an implacable revealer, decomposes compounds into their essential elements, revealing their true chemical nature.

Cita Educativa

> El calor, como un revelador implacable, descompone los compuestos en sus elementos esenciales, mostrando su verdadera naturaleza química.

— Prof. Ana Morales, Doctora en Química Educativa

Source: Y8 AQA Activate PowerPoint Lesson on Thermal Decomposition

This slide is a section header titled "Experimentos y Seguridad." Its subtitle highlights a safe laboratory demonstration featuring observable color changes and gases.

Experimentos y Seguridad

Experimentos y Seguridad

Demostración segura en el laboratorio: Observa cambios de color y gases.

Source: Y8 AQA Activate PowerPoint lesson on thermal decomposition

This timeline traces the history of thermal decomposition, first observed in carbonate minerals in the 1700s and studied by Antoine Lavoisier in the late 1700s. It evolved into industrial lime production from limestone in the 1800s and remains a key step in modern Portland cement manufacturing today.

Historia Rápida

1700s: Discovery in Carbonates Thermal decomposition first observed in carbonate minerals. Late 1700s: Lavoisier Studies It Antoine Lavoisier investigates thermal decomposition processes. 1800s: Industrial Lime Production Applied industrially for producing lime from limestone. Today: Essential for Cement Key step in modern Portland cement manufacturing.

Source: Y8 AQA Activate PowerPoint lesson on thermal decomposition

This conclusion slide, titled "Resumen y Preguntas," declares "¡Repaso completado exitosamente!" to mark the successful completion of the review. The subtitle prompts viewers to "Dibuja un experimento" and asks "¿Alguna pregunta?" to encourage drawing an experiment and fielding questions.

Resumen y Preguntas

¡Repaso completado exitosamente!

Dibuja un experimento. ¿Alguna pregunta?

Source: y8 aqa activate powerpoint lesson on thermal decomposition