Unit 5 Study Guide

Unit 5 Study Guide: Phases Changes • Phases of Matter • Phases of Matter Worksheet 1. What are the three parts of the kinetic theory? 2. T/F Not all particles are in constant random motion. 3. Why are solids closely packed together? 4. Are the particles of a solid bonded together? 5. T/F The particles of a solid are constantly vibrating. 6. In which phase of matter can the particles not slip past one another? 7. What type of phase cannot be poured and has a definite shape? 8. What phase has a definite shape and a definite volume? 9. T/F The particles of liquids are not in contact with each other. 10. T/F Bonds hold the particles of solids together but not the particles of liquids. 11. Why can liquid particles slip past one another? 12. Why can liquids be poured? 13. What phase has no definite shape but has a definite volume? 14. In what phase are the particles close together but flow freely? 15. Why are the particles of gas not in contact with each other? 16. Which phase has no definite shape and no definite volume? 17. How would you best describe the movement of gas particles? 18. What phase can expand to fill available space? 19. Why can gases spread into different shapes? 20. What is the most common phase of matter in the universe? 21. How would you best describe how something is converted into a plasma? 22. What phase exists naturally only in stars? 23. What phase occurs mostly as crystals? • Phase changes 24. What common measurement is used to describe the average kinetic energy of the particles in a substance? 25. As average kinetic energy increases, what happens to the speed of the particles? 26. What type of energy is associated with motion? 27. What is happening at the freezing/melting point? 28. Why does a solid melt? 29. How do you get attractions to form, causing a liquid to freeze? 30. What is happening at the boiling point? 31. When something boils, what is being released in the bubbles? 32. When you add energy to a substance, the energy of the particles increases. What is the evidence for this? 33. When you add heat to a solid, the temperature increases. What happens to the temperature when you add heat at the melting/freezing point? 34. When you add heat to a liquid at the boiling point the temperature does not change. What is the extra heat used for?

35. For the temperature vs. Time graph be able to a. Describe what is happening to the slope before the phase change occurs b. Describe what is happening to the slope when the phase change is occurring c. Describe what is happening to the slope after the phase change has occurred d. Describe what is happening to the average kinetic energy before the phase change occurs e. Describe what is happening to the average kinetic energy while the phase change occurs f. Describe what is happening to the average kinetic energy after the phase change occurs 36. Why can liquids evaporate at any temperature? 37. What is sublimation?

38. What happens to the kinetic energy during 2? 39. What happens to the kinetic energy during 3? 40. What number indicates where the substance is a solid being heated up? 41. What number indicates where the substance is a liquid being heated up? 42. What number indicates where the substance is a gas being heated up? 43. What number indicates melting point? 44. What number indicates freezing point? 45. What number indicates boiling point? 46. What number indicates where something is crystallizing? 47. What number indicates where something is going from a solid to a liquid? 48. What number indicates where something is going from a gas to a liquid? 49. At what number would you find the fastest moving particles? 50. At what number would you find the slowest moving particles? 51. What is the independent variable? 52. What is the dependent variable? 53. At what temperature does the substance melt? 54. At what temperature does the substance boil? 55. At what temperature does the substance freeze?