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Welcome Back! Today we will:

Welcome Back! Today we will:. Check your books and binders. Talk about this semester’s plan. Talk about your study skills and…. Our NEW homework policy. You must finish all your homework before t he Friday before any exam or…. YOU DON’T WRITE THE EXAM!.

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Welcome Back! Today we will:

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  1. Welcome Back! Today we will: Check your books and binders Talk about this semester’s plan Talk about your study skills and…

  2. Our NEW homework policy You must finish all your homework before the Friday before any exam or…

  3. YOU DON’T WRITE THE EXAM!

  4. At the start of the class put the homework into the bucket.

  5. Books and Binders: The same as last semester.

  6. My office hours: Everyday: 7am – 7:50am Everyday: 12:15pm – 12:50pm If you ask me I can also see you at 17:00 – but you have to ask.

  7. Winter Holiday Homework – Give it to me now (In the bucket)!!

  8. Unit 1: Chemistry

  9. Unit 2: Electricity

  10. How to study? Review AND UNDERSTAND every lesson (5 – 10 minutes) Before tests study is small groups Come see me in my office!

  11. How to study activity

  12. 1. Explain what happened to the bike lock.2. Why do the lanterns fly?3. Why can we see steam when we eat hot Xiao long bao?

  13. Bike Lock?- cold, particles move slower, hard to change shape, “hard solid”- warm, particles move faster, easy to change shape, “soft solid”

  14. Lanterns?- fire inside makes particles move faster, farther- particles outside are slower, closer- outside air is more dense than air inside lantern- lantern floats up

  15. XLB?- XLB has water inside- the XLB is hot- water’s particles move faster and farther- water evaporates to steam- we see steam

  16. Chemistry is the study of changes of matter:Matter is anything that has mass or volume.Mass is the amount of stuff in something.Volume is the amount of space something needs.

  17. Chemistry is the study of changes of matter:Matter is anything that has mass or volume.Mass is the amount of stuff in something.Volume is the amount of space something needs.

  18. Chemistry is the study of changes of matter:

  19. Matter is anything that has mass or volume.Mass is the amount of stuff in something.Volume is the amount of space something needs.

  20. Matter = Stuff Apples are matter, so are cats, air particles and people. Matter is everything

  21. Matter = Stuff Apples are matter, so are cats, air particles and people. Matter is everything

  22. Mass = How much “stuff” is in something. It is NOT how heavy something is. Why? Because mass does not change on other planets, but things can be heavier of lighter on other planets.

  23. Mass = How much “stuff” is in something. It is NOT how heavy something is. Why? Because mass is the same on other planets, but things can be heavier of lighter on other planets with different gravity.

  24. Volume: How much space something needs.

  25. Volume: How much space something needs.

  26. Some things can have the same volume but different mass. For example: this cup with water and this cup without water

  27. Some things can have the same volume but different mass. For example: this cupwith water and this cup without water

  28. Mass is the amount of “stuff” in something.

  29. Mass is the how much “stuff” in something.

  30. Volume is how big something is orhow much space something needs.

  31. Which one has more volume?Which one has more mass?

  32. Thinking: For example, please think of 2 things (1 pair) that have the same (or almost the same) volume but not the same mass.

  33. If something has a big mass, does it have more or less matter in it?

  34. States (Phases) of Matter

  35. Solid

  36. Liquid

  37. Gas

  38. The particle theory of matter. All matter is made of very small particles There are spaces between the particles (different states have more or less space)

  39. The particle theory of matter. All matter is made of very small particles There are spaces between the particles (different states have more or less space)

  40. Small particles:

  41. How small are particles?One small drop of water has 1000000000000000000000 particles in it.

  42. Spaces are more in gas, less in solids.

  43. Spaces are more in gas, less in solids.

  44. 3. The particles are always moving. 4. Particles like to “go together”

  45. Particles move fast and far in gases. Particles move slower and closer in liquids. Particles “shake” in solids.

  46. Particles move fast and far in gases. Particles move slower and closer in liquids. Particles “shake” in solids.

  47. Look at these two reactions 反应. How are they different?

  48. Physical vs. Chemical change The physical change there is no new substance (物质), just frozen water and common water. The chemical change there is a new substance. It is CO2.

  49. Physical vs. Chemical change The physical change there is no new substance (物质), just frozen water and common water. The chemical change there is a new substance. It is CO2.

  50. Examples?

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