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# Changes of state notes

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### Transcript

• 1. 1.Take out your homework packet. 2.What questions do you want us to review?
• 2. States of Matter Chapter 2
• 3. • What happened when we rubbed the alcohol on our hands/desks??
• 4. • What types of things can we do to change water into ice, steam, liquid??
• 5. Changes of State • Chapter 2; Section 2
• 6. I. Changes of State • Physical changes • Converting from 1 form to another • Change the energy of substances
• 7. • Does ice or liquid water have more energy? (energy of motion)
• 8. 1. Temperature • Measure speed of particles • Measure of energy (of motion) • Use a thermometer
• 9. • Which has a higher temperature, steam or liquid water?
• 10. • Which has a higher energy, steam or liquid water?
• 11. • Make a Venn Diagram comparing liquid and gas with regards to state of matter, particle motion, temperature and energy. Liquid Gas
• 12. • Share your Venn Diagram with your neighbor. • Talk about all the ideas you know and can explain about Liquids and Gases. • If time remains, talk about solids too Liquid Gas
• 13. 2. Heat • Transfer energy • Cause change in temperature
• 14. 3. Endothermic vs Exothermic • ENDothermic = absorbs heat/energy • EXOthermic = releases heat/energy
• 15. • What is the difference between endothermic and exothermic reactions? • Give 1 example of each process.
• 16. Changes of State… Endo or Exo? What is happening? Special stuff? Melting Freezing Vaporization Condensation Sublimation
• 17. A. Melting • Endothermic (Motion of molecules increases) • Solid to liquid
• 18. B. Freezing • Exothermic (Motion decreases) • Liquid to solid
• 19. C. Vaporization • Endothermic (Motion increases) • Liquid to gas a. Boiling: throughout the liquid b. Evaporation: on the surface
• 20. D. Condensation • Exothermic (Motion of molecules decreases) • Gas to liquid
• 21. E. Sublimation • Endothermic (Motion increases) • Solid to gas
• 22. Melting vs Freezing • Same temperature • Called the melting point
• 23. • T or F Evaporation can occur at any temperature. • T or F Boiling occurs only at the surface of a liquid. • T or F Vaporization is simply a liquid changing to a gas.
• 24. Vaporization vs Condensation • Same temperature • Called boiling point
• 25. 1.What is mass? 2.Do you think changes of state affect mass? Why or why not?
• 26. 1.What happened to the mass of the apparatus while it heated? 2.Why did the balloon inflate? 3.What state change occurred? 4.When a liquid turns to a gas, what happens to its mass? Volume? Density?
• 27. 1.What is the phase change that converts liquids to gases? 2.What is the name of the point at which this change occurs?
• 28. 1. At your table, share data and observations from the Hot-Cold lab with the people you sit with.
• 29. 1. In the Hot and Cold lab, what state change occurred with the ice buckets? 2.What did you do in that experiment to lower the freezing point of the ice below 0oC? (you do this all the time in the winter)
• 30. Heat (thermal energy) TemperatureºC. 100 0 A B C D E solid liquid gas Water Phase Change GraphChanging the state of water graph
• 31. Heat (thermal energy) TemperatureºC. 100 0 A B C D E solid liquid gas
• 32. Heat (thermal energy) TemperatureºC. 100 0 A B C D E melting freezing condensing boiling
• 33. Changes of state occur between B-C and D-E. What happens to the temperature during the state changes?
• 34. Phase Change Diagram
• 35. Label the five arrows below with The name of the change of state: SOLID LIQUID GAS melting vaporization sublimation condensationfreezing
• 36. 1.What is the difference between condensation and vaporization? 2.What is similar between condensation and vaporization?
• 37. Warm up 1.Take out your Chapter 2 review sheet. 2.With your group members, arrange the arrows, pictures, and words to show the state changes of water.
• 38. Gas Laws Chapter 2 Test Review
• 39. ENDOTHERMIC ENDOTHERMIC EXOTHERMIC EXOTHERMIC ENDOTHERMIC Melting Vaporization Sublimation CondensationFreezing
• 40. Internet Demos…
• 41. Which law is it? Why?
• 42. Which law is it? Why?
• 43. Scientific Method… In a science experiment, you have several factors: 1. Constant: the item that is not changing throughout the experiment 2. Independent variable: The factor the scientist is changing 3. Dependent variable: The factor that changes because of the independent variable
• 44. Vacuum Pump Demo: What 2 variables are being changed? Which law is being demonstrated? Why do you know?
• 45. Glove Demo: What 2 variables are being changed? Which law is being demonstrated? Why do you know?
• 46. Pumpkin Demo: Is this reaction endothermic or exothermic? Why do you know?
• 47. State change graph: Is this graph endothermic or exothermic? Why? What states are present at A, C, E? What state changes happen at D, B? A. B. C. D. E.
• 48. Extension… How can you change the boiling point or freezing point of water? (Hint: you probably do this and don’t know exactly why!)
• 49. 1.Complete the exit slip on your desk.