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States of matter 2010
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States of matter 2010

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  • 1. 1. Is it a chemical or physical change when you make scrambled eggs? Why? 2.If I mix baking soda with vinegar and a gas is produced, is that a chemical or physical change? Why?
  • 2. Demos… (Before) Make some qualitative observations. What do you think will happen? Explain.
  • 3. Demos… Make some qualitative observations. What happened? Explain.
  • 4. Demos…
  • 5. States of Matter Chapter 2
  • 6. • Dip a Q-tip in the rubbing alcohol • Rub the Q-tip on the back of your hand • What observations can you make about this process?
  • 7. 4 States of Matter • Chapter 2; Section 1
  • 8. I. States of Matter • Physical form of a substance • 4 states of matter
  • 9. Why does the air freshener smell up the entire room over time?
  • 10. • Matter is made of atoms & molecules; They are ALWAYS moving • STATES OF MATTER= changes in Speed & attraction of the molecules
  • 11. A. Solids • Definite shape and volume • Particles close together
  • 12. • Strong attraction • Particles vibrate in place
  • 13. 1.What ways are solids, liquids, and gases different?
  • 14. B. Liquids • Change shape NOT volume • Take the shape of the container
  • 15. • Molecules slide around • Difficult to squeeze together
  • 16. Gels? • Liquids that have tiny solids suspended in them • Elastic properties
  • 17. 1.Take out your Review Sheet 2.What are 2 things you learned in chapter 1? 3.What is 1 thing you don’t understand?
  • 18. 1.How do molecules move in solids? 2.How do molecules move in liquids? 3.How tightly packed are the molecules in solids and liquids?
  • 19. Demos…(After) Make some qualitative observations. What happened? Why?
  • 20. Demos… What is happening in the flask? Why-is it a chemical change or a physical change? Explain.
  • 21. • Drop 2 drops of food coloring into the flour on the plate • Put the clean toothpick into 1 drop • Put the toothpick dipped in soap into the other drop • What observations did you make?
  • 22. 1. Surface Tension • Force causing liquids to form spherical drops
  • 23. 2. Viscosity • Liquid’s resistance to flow
  • 24. C. Gases • Change shape and volume • Move so fast they break apart
  • 25. • Less attraction • Empty spaces
  • 26. • What did you observe about the 2 containers? • Why did it take longer for the lid to pop off one of them?
  • 27. 1. Pressure • Force on an area • Number of collisions of particles against the container
  • 28. D. Plasmas • No definite shape or volume • Molecules are broken apart
  • 29. • Conduct electricity; affected by electric and magnetic fields
  • 30. 1.What are the properties that describe a liquid? 2.What are the properties that describe a gas?
  • 31. II. Gas Laws • Gases show big volume changes • Based on pressure and temperature
  • 32. A. Boyle’s Law • For a fixed amount of gas at a constant temperature, the volume of a gas increases as its pressure decreases • Volume decreases as pressure increases
  • 33. B o y l e ’ s O p p o s i t e P r e s s u r e If P then V If P then V
  • 34. • Observe the balloons inside the beakers. • What do you notice happening to each? • Explain why one gets larger while one gets smaller.
  • 35. B. Charles’s Law • For a fixed amount of gas at a constant pressure, volume increases as temperature increases • Also, volume decreases as temperature decreases
  • 36. C h a r l e ’ s S a m e T e m p e r a t u r e If T then V If T then V
  • 37. ????? • One of your friends over inflated the tires on their bicycle. Use Charles’s Law to explain why they should let out some of the air before going for a ride on a hot day.
  • 38. 1.What does Boyle’s Law mean? 2.Why does volume increase when you decrease pressure?
  • 39. The Can Crusher • Observe the experiment. • Why did the can crush??????
  • 40. Hmm… • Why does popcorn pop?
  • 41. Recap…
  • 42. 1.What can you observe about the 2 experiments? 2.Explain what is actually happening to cause each.

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