LS6_a - Unit 2 How do we analyze chemical change? Emission...

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Chemistry XXI Unit 2 How do we analyze chemical change? Emission Spectroscopy
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Chemistry XXI Lab Session 6 How can we use light to detect substances?
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Chemistry XXI Your Challenge Sparklers are a mixture of chemical substances that emit light of different colors when heated. Your task is to use emission spectroscopy to detect the presence of certain chemical elements in sparklers of different colors. What chemical elements are responsible for the color of different sparklers?
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Chemistry XXI Light Emission Chemical substances emit “ electromagnetic radiation ( EM ) when heated or when they absorb energy in some other form. The nature of the radiation that is emitted can give us a clue about the nature of the substances present in a given system.
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Chemistry XXI Atoms and molecules are made of charged particles ( electrons , protons ) that can absorb and emit electromagnetic radiation. Experiments indicate that atoms of different elements emit EM radiation of specific frequencies. Selective Emission Spectrum Fingerprint
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Chemistry XXI Detection Given that the spectrum of an element is like a fingerprint, we can use spectroscopy to detect the presence of elements in different systems.
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Chemistry XXI In order to detect substances in a system using spectroscopy, we need to generate the spectra of known elements or compounds to use them for comparison ( references ). A well-studied gas with a well-
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LS6_a - Unit 2 How do we analyze chemical change? Emission...

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