answer:La Ley 39/2015, de 1 de octubre, del Procedimiento Administrativo Común de las Administraciones Públicas, es una normativa que regula el funcionamiento de la actividad administrativa en España. Esta ley tiene como objetivo principal establecer las normas y principios que rigen las relaciones entre los ciudadanos y las diferentes administraciones públicas, garantizando la transparencia, eficacia y eficiencia en la gestión de los procedimientos administrativos. La Ley 39/2015 establece los derechos y obligaciones de los ciudadanos en sus relaciones con la Administración pública, así como los principios de actuación de las mismas, como la buena fe, la colaboración, la lealtad y la objetividad. También regula aspectos como la simplificación de los procedimientos administrativos, la utilización de medios electrónicos en la tramitación de los mismos, y la garantía de los derechos de los ciudadanos en su relación con la Administración. En resumen, la Ley 39/2015 busca modernizar y agilizar la gestión administrativa, garantizando la igualdad de trato, la transparencia y la calidad en los servicios públicos. Es una normativa clave para asegurar la eficacia y eficiencia en la actuación de las administraciones públicas en España.

answer:If you are referring to the multiplication of 2 by 2, the answer is 4.

answer:Creating a science fair project around the topic of elephant toothpaste fits nicely under the category of chemistry. Here's an idea for your project that explores chemical reactions using the popular demonstration known as "elephant toothpaste." # Title: The Chemistry behind Elephant Toothpaste # Objective: To understand how the concentration of reactants affects the rate and size of the elephant toothpaste reaction. This experiment is a fun way to explore exothermic reactions, catalysis, and the decomposition of hydrogen peroxide. # Background: The elephant toothpaste reaction is a foamy substance caused by the rapid decomposition of hydrogen peroxide. This reaction is catalyzed by potassium iodide or yeast and warm water in a concentrated solution. As the hydrogen peroxide breaks down into water and oxygen gas, soap captures the oxygen gas, creating foam. The reaction is also exothermic, meaning it releases heat. # Materials: - Hydrogen peroxide (Different concentrations for the experiment: 3% commonly found in pharmacies, 6% (beauty supply), and 12% (for higher grade reactions, usually from science suppliers), but always ensure safety first and work within your school's guidelines) - Liquid dish soap - Yeast as a catalyst or potassium iodide (KI) if available - Warm water - Safety goggles and gloves - Food coloring (optional) - Graduated cylinders or measuring cups - Plastic bottles or similar containers - Tray to catch foam - Thermometer # Procedure: 1. Put on your safety goggles and gloves. 2. In separate containers, prepare your catalyst solution by mixing yeast with warm water. If using potassium iodide, measure the needed amount. Let yeast mixture sit for about 5 minutes. 3. Add a squirt of dish soap to the bottle (optionally, mix in food coloring). 4. Pour hydrogen peroxide into the bottle. The amount will depend on the size of the demonstration, but typically, 1/2 cup is effective. 5. Quickly add the yeast mixture or potassium iodide to the bottle containing the hydrogen peroxide and step back. # Variables: - The concentration of hydrogen peroxide - The amount of catalyst used # Data Collection: - Measure the height of the foam produced with different concentrations of hydrogen peroxide. - Record the temperature change during the reaction to discuss the exothermic nature of the reaction. - Observe and note any differences in reaction speed. # Conclusion: Analyze how different concentrations of hydrogen peroxide affect the reaction rate and foam production. Discuss the role of the catalyst and why the reaction is exothermic. # Safety Note: Always ensure that you consult with your teacher or science fair coordinator before conducting experiments, especially those that involve chemicals. Wearing protective safety gear (goggles, gloves) is a must, and conducting the experiment under adult supervision is highly recommended. This project allows you to explore and explain a visually appealing chemical reaction while delving into important principles of chemistry. Good luck with your science fair project!

answer:I predict that the chemical reaction between hydrogen peroxide and potassium iodide will create a foamy substance similar to toothpaste, resembling the appearance of an elephant's toothpaste.