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Suddenly it glows an eerie green, bright enough to swing on your wrist as you walk from house to house. But here's the strange part: if you touch that glowing stick, it feels cool, not warm. How can something make light without making any heat?  \nThe answer is a bit of science with a big name: chemiluminescence, which simply means \"light made by chemicals. \" Inside every glow stick are  \ntwo separate liquids, and one of them sits in a thin glass tube. When you bend the stick, that glass tube breaks and the two chemicals rush together and mix. Their reaction gives off energy as light instead of heat, so the glow is cold to the touch.  \nBecause it's all about a chemical reaction, temperature changes how fast that reaction goes. On a chilly night, the chemicals move slowly, so a cold glow stick looks dim and can last a long time. Warm it up in your hands or a bowl of hot water, and it will suddenly shine much brighter. The tradeoff is that a warm, bright stick burns out faster, like a candle racing to the end.  \nGlow sticks aren't the only things that light up in the dark, but they work differently from your glow-in-the-dark stars. Those plastic stars use a paint called a phosphor that soaks up light like a sponge soaks up water. Hold them under a lamp, then flip off the switch, and they slowly release that stored light for minutes afterward. This trick has a name too: phosphorescence, and unlike aglow stick, it can be recharged again and again.  \nThat same idea of catching light helps keep trick-or-treaters safe on Halloween night. Reflective tape on a costume or bag doesn't make its own glow, but it bouncesa car's headlights straight back to the driver. A glowing bracelet, a strip of shiny tape, and a small flashlight can make you easy to spot in the dark. Isn't it wild that the same glow stick lighting up your costume uses the very same kind of chemistry that makes some deep-sea fish and fireflies shine?  \nHow Glow Sticks Glow  \nName:  \n\n| Solve each problem.\u003Cbr>Use the article to answer the question.\u003Cbr>1) What does the word \"chemiluminescence\" mean, according to the passage?\u003Cbr>A. Light stored from a lamp B. Color made by glass tubes\u003Cbr>C. Heat made by chemicals D. Light made by chemicals |  |  |  |  | Answers\u003Cbr>1.  \u003Cbr>2.   |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| 2) Which sentence best states the main idea of the whole passage?\u003Cbr>A. Different Halloween items make or bounce light in different ways\u003Cbr>B. Cold nights ruin most glowing Halloween toys\u003Cbr>C. Glow sticks are the safest way to trick-or-treat\u003Cbr>D. Fireflies and deep-sea fish glow all year long |  |  |  |  | 3.  \u003Cbr>4.  \u003Cbr>5.   |  |  |  |  |  |\n| 3) Why does a glow stick feel cool instead of warm when it glows?\u003Cbr>A. It bounces light back rather than making its own\u003Cbr>B. Its reaction gives off energy as light instead of heat\u003Cbr>C. It stores light from a lamp before it is snapped\u003Cbr>D. It is filled with cold water that never warms up |  |  |  |  | 6.  \u003Cbr>7.  \u003Cbr>8.   |  |  |  |  |  |\n| 4) How does reflective tape help keep trick-or-treaters safe?\u003Cbr>A. It mixes chemicals to make a bright color\u003Cbr>B. It makes its own glow like a glow stick does\u003Cbr>C. It bounces a car's headlights back to the driver\u003Cbr>D. It stores light and releases it slowly |  |  |  |  | 9.  \u003Cbr>10.   |  |  |  |  |  |\n| 5) How is phosphorescence different from a glow stick?\u003Cbr>A. It gives off heat as it glows B. It can be recharged again and\u003Cbr>again\u003Cbr>C. It only works on cold nights D. It needs a glass tube to be\u003Cbr>snapped |  |  |  |  |  |  |  |  |  |  |\n| 6) What happens right after you bend a glow stick?\u003Cbr>A. A phosphor paint soaks up light from the room\u003Cbr>B. Reflective tape bounces headlights back to a driver\u003Cbr>C. A glass tube breaks and the two chemicals mix together\u003Cbr>D. A battery inside turns on and heats the liquid |  |  |  |  |  |  |  |  |  |  |\n| 7) How doe","cbCaiopL41Vci1vk","https://ap.wps.com/l/cbCaiopL41Vci1vk","pdf",77866,"English","# Questions\n## Comprehension and Science Concepts","[{\"question\":\"What does chemiluminescence mean in the passage?\",\"answer\":\"It means “light made by chemicals.”\"},{\"question\":\"Why does a glow stick feel cool instead of warm?\",\"answer\":\"The chemicals react to give off energy as light instead of heat, so the glow is cold to the touch.\"},{\"question\":\"How does warming a glow stick affect its glow and lifespan?\",\"answer\":\"It shines much brighter, but the glow burns out faster than it does when the stick is cold.\"}]","How Glow Sticks Glow - Worksheet | PDF",1790809836,18]