Flame tests
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The document describes a flame test lab activity where students observe the colored flames produced by different metallic salts when heated. Different metal ions produce unique and characteristic flame colors due to the electrons within the metal atoms becoming excited and releasing energy in the form of visible light. Students test solutions of calcium, copper, lithium, potassium, strontium, and sodium salts to observe their flame colors and identify an unknown solution based on its color. Safety precautions are outlined for working with the heated metal salts and acid solutions.
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![Flame Tests<br />SSS:<br />SC.A.2.4.6 The student understands that matter may act as a wave, a particle, or something else entirely different with its own characteristic behavior. <br />SC.B.1.4.4.-The student knows that as electrical charges oscillate they create time-varying electric and magnetic fields that propagate away from the source as an electro-magnetic wave.<br />Background:<br />Flame tests provide a way to test for the presence of specific metallic ions. The heat of the flame excites the loosely-held electrons in the metal ion prompting the electrons to jump from a ground level to a higher energy level in the atom. As the electrons fall back to their ground state, energy is released from the excited electrons and can be seen as a colored flame. The color is a combination of the wavelengths of each transition and can be used to determine the identity of an unknown ion. Although white light produces a continuous spectrum in which all wavelengths of visible light are present (400-700nm), an excited electron produces one or more specific lines in the spectrum. This unique spectrum corresponds to an elementโs distinct electron configuration. <br />Purpose of Lab/Activity: <br />Observe the spectra emitted by different ions.<br />,[object Object],Safety: <br />,[object Object]](https://image.slidesharecdn.com/flametests-101130132717-phpapp02/85/Flame-tests-1-320.jpg)
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โ โฌ PILO, Silverio
โ โฌ PINGAPING, May-an
โ โฌ SABADO, Rudelyn
BSE IV A - English
(2015)ย
Redox reactions
This document provides an overview of redox (reduction-oxidation) reactions, including definitions of key terms like oxidation, reduction, oxidizing agents, reducing agents, and disproportionation reactions. It discusses identifying oxidation and reduction based on changes in oxygen, hydrogen, or electron content. Methods for determining oxidation states and balancing redox reactions using the half-reaction method are also described. Real-world examples of redox processes like corrosion and the blue bottle experiment are mentioned.
E-learning Identification of ions and gases
1. Qualitative analysis identifies substances by their properties, while quantitative analysis determines amounts.
2. Tests for color, smell, solubility, and pH can help identify substances. Common cation tests use sodium hydroxide or ammonia to cause color changes.
3. Anion tests often involve precipitation and can identify carbonate, chloride, iodide, and sulfate ions. A series of video links provide examples of common cation and anion tests.
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Atomic absorption spectroscopy analyzes elements by heating samples to atomize elements and measuring light absorption. It can analyze water, foods, oils, soils, and blood. Elements are heated until atoms form, which absorb light from hollow cathode lamps at element-specific wavelengths. Flames or graphite furnaces are used to heat samples. Graphite furnace atomic absorption allows smaller sample sizes and higher sensitivity than flame atomic absorption. Interferences can occur but can be corrected. Atomic absorption spectroscopy can detect elements at the parts-per-million and parts-per-billion levels.
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https://app.box.com/s/qhtvq32h4ybf9t49ku85x0n3xl4jhr15ย
Leveraging Generative AI to Drive Nonprofit Innovation
In this webinar, participants learned how to utilize Generative AI to streamline operations and elevate member engagement. Amazon Web Service experts provided a customer specific use cases and dived into low/no-code tools that are quick and easy to deploy through Amazon Web Service (AWS.)
Elevate Your Nonprofit's Online Presence_ A Guide to Effective SEO Strategies...
Whether you're new to SEO or looking to refine your existing strategies, this webinar will provide you with actionable insights and practical tips to elevate your nonprofit's online presence.
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Flame tests
- 2. Tie back hair and secure loose bulky clothing while working near a flame.
- 3. All of the salt solutions (except NaCl) are toxic, if any of the solutions splash on your skin, wash affected area with large amounts of water and notify your teacher.
- 4. Handle carefully the heated nichrome wire. Make sure to hold only from the handle.
- 6. lab apron
- 9. wash bottle with distilled water
- 10. well plate
- 11. hydrochloric acid (HCl) 6.0 M in a dropper bottle
- 12. solutions of metallic salts:
- 20. Calculate the frequency of the wave.
- 21. Calculate the energy of a photon with this wavelength.How is spectrometry used to determine the composition of stars? <br />