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Cool Blue Labettini

Cool Blue Labettini. • • •. TRAYS: “Cool Blue” kit — don’t eat anything Water container & 10 ml graduated cylinder Placemat PREP 1: Jot the following headings in your notebook … OBSERVATIONS: Luminol only — 2. Luminol + Perborate — 3. L + PB + Copper Sulfate —. Cool Blue Labettini.

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Cool Blue Labettini

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  1. Cool Blue Labettini • • • • TRAYS: • “Cool Blue” kit — don’t eat anything • Water container & 10 ml graduated cylinder • Placemat • PREP 1: • Jot the following headings in your notebook … • OBSERVATIONS: • Luminol only — • 2. Luminol + Perborate — • 3. L + PB + Copper Sulfate —

  2. Cool Blue Labettini PREP 2: Measure 10 ml water and pour into cup Use “L” scoop to measure and HOLD one scoop of Luminol Use “PB” scoop to measure and HOLD one scoop of PerBorate Use last scoop to measure and HOLD about 1/2 scoop of copper sulfate

  3. Cool Blue Labettini EXPERIMENT • • • • • • DO NOT STIR DURING THE FOLLOWING STEPS Turn off lights. Add luminol to water & observe. Add perborate to water & observe. Turn lights on record your observations. Turn lights off. Add copper sulfate to water & observe — especially where the light is brightest! NOW swirl the contents of the cup and observe. Record your observations in your notebook.

  4. Cool Blue: Chemiluminescence Q: Is the reaction exothermic or endothermic? How do you know? BTW: The copper acts as a CATALYST — it doesn’t actually react with anything, but it makes the reaction go faster. HOW?

  5. Cool Blue: Chemiluminescence NH2 O O Sodium carbonate (base) Sodium perborate (oxidizer) H C C C C C C C C O- N + Na2CO3 (aq)+ 2 NaBO3 (aq) C C C C N O- NH2 H C C C C Luminol (5-amino 2,3-dihydrophthalazine 1,4 dione) O O N2 (g) + H2CO3 (aq) + 2 NaBO2 (aq) + 2 Na+ + …  Electrons get excited as bonds are broken, but settle down and emit light as bonds are made.

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