1. Spring Semester PHYSICAL SCIENCE BELL RINGERS

2. BELL RINGER APRIL 13, 2012 What is activation energy? Turn in 5 bellringers from this week when finished.

3. BELL RINGER APRIL 12, 2012 What is the difference between an exergonic and endergonic reaction? Exothermic and endothermic?

4. BELL RINGER APRIL 11, 2012 What is chemical kinetics?

5. 1 ST & 4 TH 4/11/12 – BELL RINGER What does a catalytic converter do?

6. BELL RINGER APRIL 10, 2012 Balance and identify the type of reaction HCl + CaCO 3  CaCl 2 + H 2 O + CO 2

7. 1 ST & 4 TH - 4/10/12 - BELLRINGER Explain what is happening at a molecular level when energy is added or removed.

8. BELL RINGER APRIL 9, 2012 Tell me three things you did over Spring Break Turn in 5 bell ringers from before Spring Break if you were absent 3/30

9. 3/30/12 What is the activity series? Turn in 4 bellringers when finished. Come show me your 23.1-.3 notes when bell ringer is turned in!

10. 3/29/12 – BELL RINGER What is a precipitate?

11. 3/28/12– BELL RINGER How do chemists use chemical equations to show chemical changes?

12. Bell Ringer 3/27/12 What do you do differently when naming ionic compounds vs. covalent compounds?What do you do differently when naming ionic compounds vs. covalent compounds? How can you tell if a compound is ionic or covalent?How can you tell if a compound is ionic or covalent?

13. 3/26/12 – BELL RINGER Give an example of the following reaction types: Synthesis reaction Decomposition reaction Single displacement reaction Double displacement reaction

14. 3/23/12 – BELL RINGER Why can’t you remove atoms from molecules/compounds to balance equations? (BESIDES the law of conservation) Turn in 5 bell ringers from this week when finished.

15. 3/22/12 – BELL RINGERS What is happening in this chemical reaction?

16. 3/21/12 – BELL RINGER Balance this equation: H 3 PO 4 + HCl → PCl 5 + H 2 O

17. 3/20/12 – BELL RINGER Write an equation from the following: 3 units of Barium fluoride reacts with 6 units of Potassium hydroxide to produce/yield 3 units of Barium hydroxide and 6 units of Potassium fluoride

18. 3/19/12 – BELL RINGER Label the following as solid, gas, liquid, and aqueous at room temperature: Oxygen A solution Mercury Iron

19. 4 TH & 5 TH - 3/15/12 – BELL RINGER Water freezing or boiling is not chemical reaction. Why? Turn in 4 bell ringers from this week

20. 1 ST 3/15/12 – BELL RINGER What kind of reactions can you think of? (Think outside the box!)

21. 4 TH & 5 TH - 3/14/12 – BELL RINGER What kind of reactions can you think of? (Think outside the box!)

22. 1 ST 3/14/12 – BELL RINGER How would you write the name of Cu 2 O? How would you write the formula for lead (IV) oxide? HINT – These are transition metals!

23. 4 TH & 5 TH - 3/13/12 – BELL RINGER How would you write the name of Cu 2 O? How would you write the formula for lead (IV) oxide? HINT – These are transition metals!

24. 1 ST 3/13/12 – BELL RINGER What confuses you most in this chapter? Show Mrs. Green your notes from this chapter (22) when finished.

25. 5 TH - 3/12/12 – BELL RINGER What is the correct molecular formula for the compound, dinitrogen pentoxide? What is the correct name for the compound, S 2 F 10 ?

26. 4 TH 3/12/12 – BELL RINGER What confuses you most in this chapter? Show Mrs. Green your notes from this chapter (22) when finished.

27. 1 ST 3/12/12 – BELL RINGER When a girl asked the nitrogen monoxide out on a date, what did it say? A hydrogen atom was talking to potassium. Potassium said “I lost an electron.” The hydrogen said “Are you sure?” How did the potassium reply?

28. 1 ST & 4 TH 3/09/12 – BELL RINGER What is the correct molecular formula for the compound, dinitrogen pentoxide? What is the correct name for the compound, S 2 F 10 ? Turn in 4 bell ringers from this week

29. 3/8/12 – BELL RINGER Write the formula for the following: Iron (III) phosphide Ammonium chloride 5 th = Turn in 3 bell ringers from this week

30. 3/7/12 – BELL RINGER There are many sites stating that we should ban dihydrogen monoxide, saying… Prolonged exposure to it as a solid causes severe tissue damage. When gaseous, can cause severe burns. Leads to corrosion and oxidation of many metals. Why are these websites funny?

31. 3/6/12 – BELL RINGER No bell ringer, ACT test

32. 3/5/12 – BELL RINGER What would the formula for a compound containing lithium and nitrogen be? What would the formula for a compound containing calcium and phosphorus be?

33. 3/2/12 BELL RINGER How might you write the chemical formula for this? What is it? Turn in 5 bell ringers when finished

34. 3/1/12 – BELL RINGER What do ionic bonds and covalent bonds have in common? How are they different?

35. 2/29/12 – BELL RINGER Draw and fill in a Venn diagram to describe ionic and covalent bonds. Travis, Sarah, Josh, Crystal, Collin You need to make plans to come in before or after school to make up your Ch. 19 test

36. 2/28/12 – BELL RINGER Sodium (Na) and Chlorine (Cl) combine to make a common ionic bond, which becomes table salt (NaCl). How would you draw a Lewis Dot Diagram of this bond? Travis, Bailey, Sarah, Josh, Crystal, Collin You need to make plans to come in before or after school to make up your Ch. 19 test

37. 2/27/12 – BELL RINGER What is the joke in this comic?

38. FEBRUARY 24, 2012 What do the chemical formulas CO and CO 2 stand for? What elements are in them, and how many atoms of each? Turn in 3 bell ringers from this week

39. FEBRUARY 23, 2012 Explain and draw what you think a water molecule looks like.

40. FEBRUARY 22, 2012 No Bell Ringer, Mrs. Green absent

41. FEBRUARY 21, 2012 Describe the electron cloud model of the atom.

42. FEBRUARY 20, 2012 No School

43. FEBRUARY 17, 2012 Give the period and group for each of the following elements: F, O, Al. Turn in 4 bell ringers from this week

44. FEBRUARY 16, 2012 What is the name of each of the following elements? Br, Ge, Au, Rb Classify each as a metal, a nonmetal, or a metalloid:

45. FEBRUARY 15, 2012 Explain why some elements have one capital letter and others have a capital letter and one or two lowercase letters.

46. FEBRUARY 14, 2012 Snow Day

47. FEBRUARY 13, 2012 How are isotopes the same and how are they different?

48. FEBRUARY 10, 2012 Describe how the periodic table is arranged. Turn in 5 bell ringers from this week

49. FEBRUARY 9, 2012 Compute the mass number of a phosphorous atom. Find the # of protons and # neutrons

50. FEBRUARY 8, 2012 Describe the electron cloud model of the atom.

51. FEBRUARY 7, 2012 Identify the names and symbols of three common elements.

52. FEBRUARY 6, 2012 What are protons and electrons?

53. FEBRUARY 3, 2012 Iron and oxygen combine to form rust. Compare the mass of iron and oxygen before the reaction with the mass of the rust after the reaction. Turn in 4 bell ringers from this week

54. FEBRUARY 2, 2012 Determine how the law of conservation of mass applies to chemical changes.

55. FEBRUARY 1, 2012 No bell ringers, Mrs. Green absent

56. JANUARY 31, 2012 What is the difference between a homogenous and heterogeneous mixture?

57. JANUARY 30, 2012 Name three examples of physical changes.

58. JANUARY 27, 2012 Name three examples of chemical change. Turn in 5 bell ringers from this week

59. JANUARY 26, 2012 Name three phase changes.

60. JANUARY 25, 2012 What is the difference between a homogenous and a heterogeneous mixture?

61. JANUARY 24, 2012 Provide one reason why the balls bounced differently yesterday.

62. JANUARY 23, 2012 What is the difference between a colloid and a solution?

63. JANUARY 20, 2012 Name the three states of matter. Turn in 4 bell ringers from this week

64. JANUARY 19, 2012 Explain how a nuclear reactor converts nuclear energy to thermal energy.

65. JANUARY 18, 2012 What is fractional distillation used for?

66. JANUARY 17, 2012 Describe how electricity is generated using geothermal energy.

67. JANUARY 13, 2012 Why isn’t wind energy used more in the United States? Turn in 5 bell ringers from this week which should include Wednesday’s missed conceptions

68. JANUARY 12, 2012 Name three alternative energy sources.

69. JANUARY 11, 2012 How are the products of nuclear fission different from the products of nuclear fusion?

70. JANUARY 10, 2012 Why is nuclear fusion not a reliable energy source?

71. JANUARY 9, 2012 One reason alternative energy sources are needed is because ____. a.the energy needs of the world are decreasing b.there is no limit to the supply of fossil fuels c.the population of the world is decreasing d.the supply of fossil fuel is diminishing. Turn in Homework Extension Pass

72. JANUARY 6, 2012 Explain how electricity is produced. Turn in 3 bell ringers from this week Turn in Homework Extension Pass

73. JANUARY 5, 2012 What are fossil fuels? Give an example.

74. JANUARY 4, 2012 Get out a piece of paper, write today’s date and answer the question below. Hold on to your paper as we will turn them in on Friday once we have a week of bell ringers Name three things you remember learning about 1 st semester.