SC-397
Changes of state
Lower Sec Science · Secondary 1 · Hard · Changes of state
In an experiment, iodine crystals are heated and purple vapour forms. The vapour then cools on the cold funnel and forms solid iodine again. Using kinetic particle theory, which statement best explains what happens when the vapour turns back into solid iodine on the funnel?
- The gas particles lose energy, move closer together and become fixed in place as a solid.
- The gas particles gain energy and move further apart to form a solid.
- The solid particles gain energy and spread out to become a gas.
- The solid particles lose energy and stop vibrating but stay far apart.
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