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Hannah Sheets Per. 6 CP Physical Science November 12 2015 Research Notes: Glow Sticks and Glow in the Dark Objects Glow Sticks: ➔ Snapping glow sticks kicks off chemical process that eventually leads to colored light ➔ 2 separate compartments with 2 separate chemical solutions ➔ Most glow sticks contain the solution diphenyl oxalate mixed along with dye of desired color ➔ Other solution = hydrogen peroxide ➔ ^ Contained in an inner glass cylinder ➔ Cylinder separates 2 solutions so they don’t react w/ each other ➔ When you break glass cylinder, 2 chemicals mix/react and create glow ➔ Diphenyl oxalate is oxidised by hydrogen peroxide which produces unstable compound 1,2 dioxetanedione ➔ Unstableness leads to decomposing into carbon dioxide + releases energy ➔ Electrons in molecules of dye can absorb the energy given off by 1,2 dioxetanedione, they then are in an “excited” state ➔ When electrons fall back to Previewtheir “ground state” (o rigfrominal energy) thNotesale.co.ukey lose their energy in form of photons of light ➔ ^ Process called chemiluminescencePage 1 of 4 ➔ Exact energy of light given off is dependent on structure of molecule + allows diff. colors to be exposed ➔ Range of diff. chemicals can be used as well as diff. types of dyes ➔ Molecules of dye are always present in solution ➔ Diphenyl oxalate + hydrogen peroxide slowly used up by reaction until 1 runs out and reaction ceases ➔ ^ At this point glow stick stops glowing ➔ Glow sticks should not be cut open ➔ Reaction of 2 solutions can produce small amounts of phenol as a byproduct ➔ Skin contact can result in irritation or dermatitis (red, swollen, sore, blistering skin) ➔ Reactions influenced by temperature Warm temp. = accelerate rate of reaction & cool temp. = decreased rate of reaction ➔ ^ That’s why putting glow sticks in freezer can make them last longer ( http://www.compoundchem.com/2014/10/14/glowsticks/) GlowintheDark Objects: ➔ Most glow in the dark objects need to be charged ➔ All glow in the dark products contain phosphors ➔ Phosphor = substance that radiates visible light after being energized .

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