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The questions cover endothermic versus exothermic processes, changes in kinetic and potential energy during condensation, and how molecular spacing and intermolecular forces differ among solids and liquids. It also tests vaporization at boiling conditions, ranking of melting points, interpretation of heat of fusion using particle-interaction ideas, and calculation problems based on molar enthalpy and heating/cooling curve segments.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/psi-ap-chemistry-states-of-matter-multiple-choice-review-part-a-phase-changes/461484/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/psi-ap-chemistry-states-of-matter-multiple-choice-review-part-a-phase-changes/461484.png","ImageObject",300,407,{"name":92,"@type":93},"Terk","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-07","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Which phase changes are endothermic in the review questions?","Question",{"text":112,"@type":113},"The review asks which listed phase changes would be endothermic, contrasting solid, liquid, and gas transitions such as melting and sublimation.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What statements are true when water condenses according to the provided options?",{"text":117,"@type":113},"The questions specify three statements about potential energy, the surroundings’ kinetic energy, and molecular spacing, and require selecting the correct combination.",{"name":119,"@type":110,"acceptedAnswer":120},"How does the review describe interpreting heating or cooling curves during diagonal segments?",{"text":121,"@type":113},"Diagonal portions are defined as periods where temperature is changing while no phase change occurs, meaning the substance is being warmed or cooled without using heat for a state transition.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},461484,1790792201,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},1099525198933,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","PSI AP Chemistry: States of Matter Name   \nMultiple Choice Review  \nPart A: Phase Changes  \n1. Which of the following phase changes would be endothermic?  \n(A) K(l) → K(s)  \n(B) K(g) → K(l)  \n(C) K(s) →K(g)  \n(D)K(g) → K(l)  \n(E) K(g) → K(s)  \n2. Which of the following would be true when water condenses?  \nI. The potential energy of the substance decreases.  \nII. The kinetic energy of the surroundings increases.  \nIII. The distance between the molecules increases.  \n(A) I only  \n(B) II only  \n(C) III only  \n(D)I and II only  \n(E) I and III only  \n3. As a solid element melts, the atoms become   and they have   attraction for one another.  \n(A) more separated, more  \n(B) more separated, less  \n(C) closer together, more  \n(D)closer together, less  \n(E) larger, greater  \n4. In liquids, the attractive intermolecular forces are   .  \n(A) very weak compared with kinetic energies of the molecules  \n(B) not strong enough to hold molecules relatively close together  \n(C) strong enough to keep the molecules confined to vibrating about their fixed lattice points  \n(D)not strong enough to keep molecules from moving past each other  \n(E) strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other  \n5. Of the following,   is an exothermic process.  \n(A) melting  \n(B) subliming  \n(C) freezing  \n(D)boiling  \n(E) All of the above are exothermic.  \n6. For which of the following are covalent bonds being formed?  \n(A) CO2 (l) --> CO2 (s)  \n(B) CO2 (g) --> CO2 (l)  \n(C) C(g) --> C(s)  \n(D)C(l) --> C(s)  \n(E) NaCl(g) --> NaCl(l)  \n7. Which of the following are true regarding the vaporization of water at 100oC.  \nI. The rate of liquid formation is greater than that of vapor formation at 1 atm.  \nII. The liquid and vapor phase are in equilibrium at 1 atm.  \nIII. The liquid and vapor phase are in equilibrium at any pressure.  \n(A) I only  \n(B) II only  \n(C) III only  \n(D)I and II only  \n(E) II and III only  \n8. Which of the following correctly ranks the materials from lowest to highest melting point?  \n(A) Ca \u003C Mg\u003C Sr  \n(B) NaCl \u003C CaO \u003C MgO  \n(C) CH4 \u003C CI4 \u003C CCl4  \n(D)I2 \u003C Br2 \u003C F2  \n(E) K \u003C NH3 \u003C I2  \n9. The melting point of CaO is higher than that of NaCl. Explanations for this observation include which of the following?  \nI. Ca2+ is more positively charged than Na+  \nII. O2¯ is more negatively charged than Cl¯  \nIII. NaCl has an increased coulombic attraction compared to CaO  \n(A) II only  \n(B) I and II only  \n(C) I and III only  \n(D)II and III only  \n(E) I, II, and III  \n10. Which of the following are true regarding the heat of fusion of a material?  \nI. The heat of fusion is the amount of energy that is required to melt a given quantity of material.  \nII. The amount of energy released when a substance freezes is equal to the energy absorbed when it melts.  \nIII. The heat of fusion depends on the strength of the particle interactions within the solid.  \n(A) I only  \n(B) II only  \n(C) III only  \n(D)I and II only  \n(E) I, II, and III  \n11. Using the date below, which of the following statements is true.  \n\n| Heat of Fusion (kJ/mol) |  |\n| --- | --- |\n| Na: 2.60 | Mg: 8.70 |\n| K: 2.33 | Ca: 8.54 |\n\n(A) The metallic bonding interaction becomes weaker as the elements get larger, therefore more energy is required to melt the substance.  \n(B) More energy is required to melt an element as the particle interactions become weaker.  \n(C) The heat of fusion is not affected by the strength of the particle interaction.  \n(D)The increased dispersion forces of Mg account for its large heat of fusion.  \n(E) None of the above  \n12. Which of the following would have the lowest heat of fusion?  \n(A) Na  \n(B) Li (C) K  \n(D)Mg  \n(E) Be  \n13. Which of the following would have the highest heat of vaporization?  \n(A) C3H8  \n(B) CH3Cl  \n(C) Ne  \n(D)H2O  \n(E) C2H4  \n14. The substance with the lowest heat of vaporization is __________.  \n(A) I2  \n(B) Br2  \n(C) Cl2  \n(D)F2  \n(E) O2  \n15. If 51.0 g of a solid wit","cbCaipyvn4Tdutqx","https://ap.wps.com/l/cbCaipyvn4Tdutqx","pdf",576605,21,"English","# Phase Changes\n## Endothermic vs. exothermic\n## Condensation, melting, and intermolecular forces\n## Vaporization and phase equilibrium\n## Melting point and electrostatic explanations\n## Heat of fusion and data interpretation\n## Heat of vaporization calculations\n## Heating/cooling curve interpretation","[{\"question\":\"Which phase changes are endothermic in the review questions?\",\"answer\":\"The review asks which listed phase changes would be endothermic, contrasting solid, liquid, and gas transitions such as melting and sublimation.\"},{\"question\":\"What statements are true when water condenses according to the provided options?\",\"answer\":\"The questions specify three statements about potential energy, the surroundings’ kinetic energy, and molecular spacing, and require selecting the correct combination.\"},{\"question\":\"How does the review describe interpreting heating or cooling curves during diagonal segments?\",\"answer\":\"Diagonal portions are defined as periods where temperature is changing while no phase change occurs, meaning the substance is being warmed or cooled without using heat for a state transition.\"}]","PSI AP Chemistry - States of Matter - Multiple Choice Review - Part A: Phase Changes | PDF",1790761704,53]