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Phase Changes Worksheet Name KEY Date Per Using information found in your textbook, complete the following table. Then use the graph to answer 1-9, __Name af Process Endothermic or Exothermic? | solid — liquid [melt endothermic liquid — solid trecninea Cyo thermic liquid — gas Va.pori zahon | endottermie gas — liquid condensation exo ttermic solid gas ~ | Sublimaton endo Hermie gas > solid Aspos i hon _ CV¥vo Harmi'ce 1) As a substance goes through section (4), what happens to the distance between the particles? Tr increases 2) What is the name of the process happening during section (2)? yal fins 3) What would be‘the name of the process happening during section (4) if time were going the uther way? condensation 4) What is the melting point of this substance? ° 5) At what temperature would this sample finish bailing? 100°C, 6) The temperature at which a substance.in the liquid state freezes is the same as the temperature at which the substance (cirele one): b. Sublimes ce. Boils d, Condenses 7) Where is the energy going in stage 2 if the temp is not rising? Cale change | To beak He inkermolesular forces between roleeves ia KE) | 8) Name i Ie re changes (hat can occur at stage 2? At stage 4? Ve orizetion/ condansohon 9%) Is thee ais hing ie showing a mic or an cxothyrmic process? Crdotlermic sublimation 10) For the diagram lo the right: Labe! the phase change of each are. In the boxes under the phases draw asmall picture of how the molecules arg arranged, energy e Energy Absen bead — vow Solid @ndottarmie Li endotlevnie. G48 e —_ gxottumic Eneegy Coen Released used Be sot ten ased sition 
