Week 10 Chemistry

1. Week 10 Chemistry Atomic Theory, Electromagnetics, Physics Basics

2. Write the Learning Target Warm Up: 4 Minutes Stay in your own seat You should be working SILENTLY Which model of the atom do you identify with? Explain. Be Ready to Share Aloud A C B

3. Agenda • Warm Up: 6 Min • Gallery Walk Expectations: 3 mins • Gallery Walk: 20 mins • Guided Practice: 11 mins • Independent Practice: 12 mins • Closing: 1 Min

4. Announcements • Assignments, syllabus, and class calendar posted on Sharpstown Website (under my page) • http://www.houstonisd.org/Page/66 • Go to “Faculty & Staff” • Click on Ghosh, Niloy • Assignment names have links to worksheet/activity. If you lose the assignment from class, it is your responsibility to print it out and bring it completed.

5. Gallery Walk Expectations • Students will remain with their group • Students will not move stations until instructed to do so by teacher • Students will stay on task and remain focused for duration of activity

6. Gallery Walk • You will have 4 minutes at each station • Fill out the information on your guided notes handout • Do not move stations UNTIL instructed to do so

7. Guided Practice • Mr. Ghosh: Project a multiple question Student will: • SILENTLYread the question to your self and pick an answer [21 seconds] • Take 39 seconds to speak with your shoulder partner to chose the correct answer and discuss why it is the correct answer. [39 seconds] • When Mr. Ghosh says “SWAG” all students should be SILENT

8. Which of the above statements is (are) no longer considered to be true? • III and IV • II only • I and II • II and III Consider the following selected postulates of Dalton’s atomic theory: • Each element is composed of extremely small particles called atoms. • Atoms are indivisible. • Atoms of a given element are identical. • Atoms of different elements are different and have different properties.

9. Which of the above statements is (are) no longer considered to be true? • III and IV • II only • I and II • II and III Consider the following selected postulates of Dalton’s atomic theory: • Each element is composed of extremely small particles called atoms. • Atoms are indivisible. • Atoms of a given element are identical. • Atoms of different elements are different and have different properties.

10. As a result of Rutherford’s gold foil experiment, it was determined that the atom: • was indivisible. • was composed of a small, dense negative center but was mostly empty space. • was composed of a small, dense positive center but was mostly empty space. • was composed of negatively charged particles spread throughout a positively charged substance

11. As a result of Rutherford’s gold foil experiment, it was determined that the atom: • was indivisible. • was composed of a small, dense negative center but was mostly empty space. • was composed of a small, dense positive center but was mostly empty space. • was composed of negatively charged particles spread throughout a positively charged substance

12. Based on his observations, the English chemist John Dalton formulated an atomic theory • 1 • 2 • 3 • 4 In 1897, J.J. Thomson showed that negative charges could be made to move from one end of a cathode ray to another, causing the tube to glow. Because of this, Thomson is credited with the discovery of the electron. Based on this information, which part of Dalton’s atomic theory conflicted with Thomson’s new data?

13. Based on his observations, the English chemist John Dalton formulated an atomic theory • 1 • 2 • 3 • 4 In 1897, J.J. Thomson showed that negative charges could be made to move from one end of a cathode ray to another, causing the tube to glow. Because of this, Thomson is credited with the discovery of the electron. Based on this information, which part of Dalton’s atomic theory conflicted with Thomson’s new data?

14. The planetary model of the atom was proposed by _____. • Bohr • Thomson • Dalton • Democritus

15. The planetary model of the atom was proposed by _____. • Bohr • Thomson • Dalton • Democritus

16. Independent practice Complete the writing assignment on the scientists. You must include all of the REQUIRED information to receive FULL CREDIT

17. Closing How has the atomic model changed over time?

18. Write the Learning Target Warm Up: 4 Minutes Stay in your own seat You should be working SILENTLY How would you define light? Write a Minimum of Three Sentences

19. Agenda Warm Up: 7 Minutes Cornell Style notes: 18 Minutes Guided Practice: 10 Minutes Independent Practice: 15 Minutes Closing: 3 Minutes

20. Take out paper for notes BLUE RED

21. Light The final model of the atom stemmed from the study of light. By 1900, most scientists accepted the idea that lightwas a wave phenomenon

22. Light According to the wave phenomenon, light consisted of ELECTROMAGNETIC RADIATIONS

23. Wavelength λ Distance between the crests

24. CHECK POINT 2 How many wavelengths are in this wave cycle?

25. Frequency f Number of wave cycles to pass a given point per unit of given time.

26. Relationship between frequency and wavelength λand f are opposites(inversely related) λ decreases (↓), f increases (↑)

27. What about energy and frequency?

28. Relationship between energy and frequency Energy and frequency are directly Related E increases (↑), f increases (↑)

29. What about energy and wavelength?

30. Relationship between energy and wavelength Energy and wavelength are opposites (inversely Related) E increases (↑), λ decreases (↓)

31. Check Point Diego burns Sodium metal and watches it turn yellow at a frequency of 4.2 x 107 Hz. However, Dalvin burns an unknown metal and it emits a red light with a frequency of 2.3 x 107 Hz. Which student had the metal that emitted photons of light with a shorter wavelength? Diego

32. That’s great…But what about numbers? To compare very large or very small numbers (with scientific notation, such as 105), we need to look at the exponent Power to which a number is raised Exponent Example: 105 5 is the exponent

33. The Exponent Number Line Larger Value Smaller Value + - -3 3 -2 2 -1 1 0 Exponent

34. Check point Which value is larger, 3.2 x 106 or 1.8 x 109? 1.8 x 109 (Because 9 is bigger than 6)

35. Check point Which value is smaller, 6.1 x 10-5 or 8.9 x 10-7? 8.9 x 10-7 (Because -7 is smaller than -5)

36. Electromagnetic Spectrum This model shows the types of electromagnetic energy (separated by their different wavelengths).

37. Electromagnetic Spectrum (shortest wavelength, Highest frequency) • Gamma rays • X-rays • Ultraviolet • Visible light • Infrared • Microwaves • Radio waves (longest wavelength, lowest frequency)

38. Electromagnetic Spectrum Shortest Wavelength, Highest Frequency) Violet Indigo Blue Green Yellow Orange Red (Longest Wavelength, Lowest Frequency) (shortest wavelength) • Gamma rays • X-rays • Ultraviolet • Visible light • Infrared • Microwaves • Radio waves (longest wavelength)

39. Check Point Which portion of the electromagnetic spectrum has the lowest frequency? Blue Light X- Rays Radio Waves Infrared Waves

40. Guided Practice Mr. Ghosh: Project a multiple question Student will: Silently read the question to your self and think about an an answer [19 seconds] Take 41 seconds to speak with your shoulder partner to chose the correct answer and discuss the best answer choices and explain your opinion. [41 seconds] When Mr. Ghosh says “SWAG” all students should be SILENT

41. A wave with low energy has the following properties: • High frequency, long wavelength • High frequency, short wavelength • Low frequency, long wavelength • Low frequency, short wavelength

42. A wave with low energy has the following properties: • High frequency, long wavelength • High frequency, short wavelength • Low frequency, long wavelength • Low frequency, short wavelength

43. Electromagnetic waves with high frequencies have been used for medical imaging. These waves most likely belong to which of the following parts of the electromagnetic spectrum? • Microwaves • Infrared waves • Radio waves • X-rays

44. Electromagnetic waves with high frequencies have been used for medical imaging. These waves most likely belong to which of the following parts of the electromagnetic spectrum? • Microwaves • Infrared waves • Radio waves • X-rays

45. B A D C Which of the following graphs best represents the relationship of the frequency of an electromagnetic wave to its wavelength?

46. B A D C Which of the following graphs best represents the relationship of the frequency of an electromagnetic wave to its wavelength?

47. As a distant star moves toward Earth, the light given off by the star has a measurably higher frequency. What happens to the wavelength and energy of the photons of light when the frequency becomes higher? • The wavelength becomes longer, and the energy decreases • The wavelength becomes shorter, and the energy decreases • The wavelength becomes longer, and the energy increases • The wavelength becomes shorter, and the energy increases

48. As a distant star moves toward Earth, the light given off by the star has a measurably higher frequency. What happens to the wavelength and energy of the photons of light when the frequency becomes higher? • The wavelength becomes longer, and the energy decreases • The wavelength becomes shorter, and the energy decreases • The wavelength becomes longer, and the energy increases • The wavelength becomes shorter, and the energy increases

49. Independent Practice 85% Practice Makes

50. Closing Which direction is frequency increasing? Wavelength?