1 / 17

Topic : Chemistry Aim : Explain the different types of phase changes.

Topic : Chemistry Aim : Explain the different types of phase changes. Review : Identify the different phases of matter. The particles of a substance are closest together in a _____. The particles of a substance that does not have a definite volume or shape is

dseamons
Download Presentation

Topic : Chemistry Aim : Explain the different types of phase changes.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Topic: Chemistry Aim: Explain the different types of phase changes.

  2. Review: • Identify the different phases of matter. • The particles of a substance are closest together in a _____. • The particles of a substance that does not have a definite volume or shape is • Identify an example of a physical change. • What are 2 physical properties of matter? • Give 1 example of a chemical property.

  3. Phase Changes • Involves the absorption or release of heat (energy).

  4. 1. Melting • Solid  liquid • Melting point: temp at which a solid changes to liquid (different for every substance) Substance absorbs heat energy

  5. 2. Freezing • Liquid  solid • Freezing point: temp at which substance changes from liquid to solid Substance loses heat energy

  6. 3. Evaporation • Liquid  gas • Boiling point:temp at which liquid boils (different for every substance) GAS Liquid absorbs heat energy LIQUID

  7. 4. Condensation • Gas  liquid GAS Gas loses heat energy LIQUID

  8. 5. Sublimation • Solid  Gas • No liquid phase • Ex: dry ice GAS Solid absorbs heat energy Solid

  9. PHASE CHANGES Add heat  Energy absorbed by molecules Melting SL Evaporation LG GAS SOLID LIQUID Freezing LS Condensation GL Remove heat Energy released by molecules

  10. PHASE CHANGE GRAPH FOR WATER GAS Condensation Boiling pt = 100°C 100°C Evaporation T E M P LIQUID Freezing 0°C Freezing/melting point = 0°C Melting SOLID = phase changes Time

  11. REVIEW: 1. When a liquid becomes a solid, energy ____. 2. ____ is the process in which liquid changes to gas below the boiling point.  3. The change of a liquid to a solid is called__. 4. What happens to the position of water molecules as they lose heat energy? 5. Identify one phase change in which energy is released.

  12. 1. Melting • Solid  liquid • Heat added/absorbed  • molecules move faster & farther apart • Melting point: temp at which a solid changes to liquid (different for every substance) Substance absorbs heat energy

  13. 2. Freezing • Liquid  solid • Liquid heat energy/energy released  • Molecules slow down & come closer together • Freezing point: temp at which substance changes from liquid to solid Substance loses heat energy

  14. 3. Evaporation • Liquid  gas • Heat added/absorbed (faster & farther) • On surface of liquid  evaporation • Boiling point:temp at which liquid boils (different for every substance) GAS Liquid absorbs heat energy LIQUID

  15. 4. Condensation • Gas  liquid • Gas loses heat energy/energy released • (slow down & closer together) GAS Gas loses heat energy LIQUID

  16. Moth balls commonly undergo the process of sublimation. Sublimation is the process in which a solid changes directly to its gaseous phase, skipping the liquid phase.

More Related