Tuesday, Oct. 15 th : “A” Day Wednesday, Oct. 16 th : “B” Day (early out) Agenda

3. Tuesday, Oct. 15th: “A” DayWednesday, Oct. 16th: “B” Day (early out)Agenda • Ch. 2 review questions? • Jeopardy Review • Homework: Vocab Puzzle/Concept Review • Ch 2 test Next Time! • Concept review packets will be due

4. Chapter 2 Review • Problems on Chapter Review?

5. Ch 2 Short Answer Test Questions • The “Critical Thinking” questions in the Jeopardy review game • are the short answer questions that you will see on the Chapter 2 test!

6. Matter & Energy Ch.#2

7. THE RULES: • You will be in 5 teams • The winning team will receive mole money that can be used for 1 point on a test. • The host’s decisions are final

8. And now…here is the host of Jeopardy… Mrs. Elfline

9. Let’s Get Ready to play… Today’s Categories are:

10. Vocabulary

11. Sig Figs & Scientific Notation

12. Critical Thinking

13. Calculations!

14. Refrigerator Magnets

15. Vocabulary Sig Figs & Sci. Notation Critical Thinking Calculations! Refrigerator Magnets $100 $100 $100 $100 $100 FJ $200 $200 $200 $200 $200 $300 $300 $300 $300 $300 $400 $400 $400 $400 $400 DD $500 $500 $500 $500 $500

16. The energy of motion Answer…

17. Kinetic Energy 100

18. The kinetic energy of the particles in a sample of matter Answer…

19. Temperature 200

20. Any factor that could affect the results of an experiment Answer…

21. Variable 300

22. A statement or mathematical expression that describes a behavior of the natural world Answer…

23. Law 400

24. A chemical process that absorbs energy Answer…

25. Endothermic Process 500

26. What is the measurement 0.0455 rounded to 2 significant figures? Answer…

27. 0.046 100

28. How many sig figs are in 0.0020 mm? Answer…

29. 2 200

30. What is 0.0840 written in scientific notation? Answer…

31. 8.40 x 10-2 300

32. (6.02 x 107) (9.1 x 105)Remember sig figs! Answer…

33. 5.5 x 1013 400

34. How many significant figures does 0.00402 have? Answer…

35. 3 500

36. Explain why is an ice cube melting a physical change. Answer…

37. The water molecules are still water molecules, they haven’t chemically changed. The water has just changed states from a solid (ice) to a liquid (water). 100

38. Explain the difference between an endothermic process and an exothermic process. Answer…

39. In an endothermic process, energy is absorbed.In an exothermic process, energy is given off or released. 200

40. Explain why pictures of atoms and molecules are models. Answer…

41. Because atoms and molecules are way too small to see, scientists must use models to study their structure and behavior. 300

42. Why should a scientist record all observations, even those that appear insignificant or don’t agree with the hypothesis? Answer…

43. ALL scientific observations provide information, even if the information does not agree with the hypothesis. Many scientific discoveries have been made because experiments did not turn out as expected. 400

44. The mass of a 3.45g piece of aluminum was measured several times. The measured masses were 2.67g, 2.59g, and 2.64g. Use these results to explain the difference between accuracy and precision. Answer…

45. The measured masses were NOT close to the actual mass of the aluminum, 3.45g, so the measurements were NOT accurate.The measured masses WERE closely grouped together, so they WERE precise. 500

46. Convert 323 K to ˚C Answer…

47. 50˚C 100

48. Convert 20˚C to K Answer…

49. 293 K 200

50. An object has a mass of 57.6 g. Find the object’s density if the volume of the object is 40.25 cm3. Remember sig figs and units! Answer…