EXPLORE AND INVENT

miércoles, 5 de noviembre de 2014

Balancing equations

Balancing Worksheet

1. H₂ + O₂ ---> H₂O

2. N₂ + H₂ ---> NH₃

3. S₈ + O₂ ---> SO₃

4. N₂ + O₂ ---> N₂O

5. HgO ---> Hg + O₂

6. CO₂ + H₂O ---> C₆H₁₂O₆ + O₂

7. Zn + HCl ---> ZnCl₂ + H₂

8. SiCl₄ + H₂O ---> H₄SiO₄ + HCl

9. Na + H₂O ---> NaOH + H₂

10. H₃PO₄ ---> H₄P₂O₇ + H₂O

11. C₁₀H₁₆ + Cl₂ ---> C + HCl

12. CO₂ + NH₃ ---> OC(NH₂)₂ + H₂O

13. Si₂H₃ + O₂ ---> SiO₂ + H₂O

14. Al(OH)₃ + H₂SO₄ ---> Al₂(SO₄)₃ + H₂O

15. Fe + O₂ ---> Fe₂O₃

16. Fe₂(SO₄)₃ + KOH ---> K₂SO₄ + Fe(OH)₃

17. C₇H₆O₂ + O₂ ---> CO₂ + H₂O

18. H₂SO₄ + HI ---> H₂S + I₂ + H₂O

19. FeS₂ + O₂ ---> Fe₂O₃ + SO₂

20. Al + FeO ---> Al₂O₃ + Fe

21. Fe₂O₃ + H₂ ---> Fe + H₂O

22. Na₂CO₃ + HCl ---> NaCl + H₂O + CO₂

23. K + Br₂ ---> KBr

24. P₄ + O₂ ---> P₂O₅

25. C₂H₂ + O₂ ---> CO₂ + H₂O

26. K₂O + H₂O ---> KOH

27. H₂O₂ ---> H₂O + O₂

28. Al + O₂ ---> Al₂O₃

29. C₇H₁₆ + O₂ ---> CO₂ + H₂O

30. Na₂O₂ + H₂O ---> NaOH + O₂

31. SiO₂ + HF ---> SiF₄ + H₂O

32. C + H₂O ---> CO + H₂

33. KClO₃ ---> KCl + O₂

34. H₃AsO₄ ---> As₂O₅ + H₂O

35. KClO₃ ---> KClO₄ + KCl

36. Al₂(SO₄)₃ + Ca(OH)₂ ---> Al(OH)₃ + CaSO₄

37. P₄O₁₀ + H₂O ---> H₃PO₄

38. FeCl₃ + NH₄OH ---> Fe(OH)₃ + NH₄Cl

39. Sb + O₂ ---> Sb₄O₆

40. Ca₃(PO4)₂ + 6 SiO₂ ---> P₄O₁₀ + CaSiO₃

41. C₃H₈ + O₂ ---> CO₂ + H₂O

42. N₂O₅ + H₂O ---> HNO₃

43. Fe₂O₃ + CO ---> Fe + CO₂

44. Al + HCl ---> AlCl₃ + H₂

45. PCl₅ + H₂O ---> HCl + H₃PO₄

46. H₃BO₃ ---> H₄B₆O₁₁ + H₂O

47. H₂S + Cl₂ ---> S₈ + HCl

48. Mg + N₂ ---> Mg₃N₂

49. Fe + H₂O ---> Fe₃O₄ + H₂

50. NaOH + Cl₂ ---> NaCl + NaClO + H₂O

51. Li₂O + H₂O ---> LiOH

52. H₃PO₄ + HCl ---> PCl₅ + H₂O

52. CaC₂ + H₂O ---> C₂H₂ + Ca(OH)₂

53. HCl + K₂CO₃ ---> KCl + H₂O + CO₂

54. Fe(OH)₃ ---> Fe₂O₃ + H₂O

55. Ca(ClO₃)₂ ---> CaCl₂ + O₂

56. Pb(NO₃)₂ ---> PbO + NO₂ + O₂

57. C₂H₅OH + O₂ ---> CO + H₂O

58. BaO + H₂O ---> Ba(OH)₂

59. Xe + F₂ ---> XeF₆

60. Ca + AlCl₃ ---> CaCl₂ + Al

61. NH₄NO₃ ---> N₂O + H₂O

62. NH₃ + NO ---> N₂ + H₂O

63. Au₂O₃ ---> Au + O₂

64. H₃PO₃ ---> H₃PO₄ + PH₃

65. C₄H₁₀ + O₂ ---> CO₂ + H₂O

66. Fe₂O₃ + C ---> CO + Fe

67. Fe₃O₄ + H₂ ---> Fe + H₂O

68. FeS + O₂ ---> Fe₂O₃ + SO₂

69. O₂ ---> O₃

70. NH₃ + O₂ ---> NO + H₂O

71. I₂ + HNO₃ ---> HIO₃ + NO₂ + H₂

72. Si + S₈ ---> Si₂S₄

73. C₆H₆ + O₂ ---> CO₂ + H₂O

74. Hg₂CO₃ ---> Hg + HgO + CO₂

75. C₂H₅OH + O₂ ---> CO₂ + H₂O

76. SiC + Cl₂ ---> SiCl₄ + C

77. HClO₄ + P₄O₁₀ ---> H₃PO₄ + Cl₂O₇

78. Al₄C₃ + H₂O ---> CH₄ + Al(OH)₃

79. BaCl₂ + Al₂(SO₄)₃ ---> BaSO₄ + AlCl₃

80. V₂O₅ + HCl ---> VOCl₃ + H₂O

81. (NH₄)₂Cr₂O₇ ---> Cr₂O₃ + N₂ + H₂O

82. Ag₂S + KCN ---> KAg(CN)₂ + K₂S

83. NaHCO₃ ---> Na₂CO₃ + CO₂ + H₂O

84. Au₂S₃ + H₂ ---> Au + H₂S

85. Fe2(C₂O₄)₃ ---> FeC₂O₄ + CO₂

86. ClO₂ + H₂O ---> HClO₂ + HClO₃

87. Ca₃P₂ + H₂O ---> Ca(OH)₂ + PH₃

88. KO₂ + CO₂ ---> K₂CO₃ + O₂

89. As + NaOH ---> Na₃AsO₃ + H₂

90. MgNH₄PO₄ ---> Mg₂P₂O₇ + NH₃ + H₂O

91. MnO₂ + HCl ---> MnCl₂ + H₂O + Cl₂

92. Pb + Na + C₂H₅Cl ---> Pb(C₂H₅)₄ + NaCl

93. Ca(OH)₂ + H₃PO₄ ---> CaHPO₄ + H₂O

94. Zn + NaOH + H₂O ---> Na₂Zn(OH)₄ + H₂

95. SrBr₂ + (NH₄)₂CO₃ ---> SrCO₃ + NH₄Br

96. Hg(OH)₂ + H₃PO₄ ---> Hg₃(PO₄)₂ + H₂O

97. Ca₃(PO₄)₂ + SiO₂ + C ---> CaSiO₃ + P₄ + CO

98. I₄O₉ ---> I₂O₆ + I₂ + O₂ (this equation can be balanced with various sets of coefficients)

99. C₂H₃Cl + O₂ ---> CO₂ + H₂O + HCl

100. (NH₄)₂Cr₂O₇ ---> NH₃ + H₂O + Cr₂O₃ + O₂

101. Al + NaOH + H₂O ---> NaAl(OH)₄ + H₂

102. NH₄Cl + Ca(OH)₂ ---> CaCl₂ + NH3 + H₂O

103. Al + NH₄ClO₄ ---> Al₂O₃ + AlCl₃ + NO + H₂O

104. H₂SO₄ + NaHCO₃ ---> Na₂SO₄ + CO₂ + H₂O

105. Ca₁₀F₂(PO₄)₆ + H₂SO₄ ---> Ca(H₂PO₄)₂ + CaSO₄ + HF

106. Ca₃(PO₄)₂ + H₂SO₄ ---> CaSO₄ + Ca(H₂PO₄)₂

107. H₃PO₄ + (NH₄)₂MoO₄ + HNO₃ ---> (NH₄)₃PO₄ ^. 12MoO₃ + NH₄NO₃ + H₂O

108. C₄H₁₀ + Cl₂ + O₂ ---> CO₂ + CCl₄ + H₂O

109. C₇H₁₀N + O₂ ---> CO₂ + H₂O + NO₂

110. K₄Fe(CN)₆ + KMnO₄ + H₂SO₄ ---> KHSO₄ + Fe₂(SO₄)₃ + MnSO₄ + HNO₃ + CO₂+ H₂O

112. CaF₂ ⋅ 3Ca₃(PO₄)₂ + H₂SO₄ + H₂O ---> H₃PO₄ + HF + CaSO₄ ⋅ 2H₂O

miércoles, 10 de septiembre de 2014

1. While traveling along a highway a driver slows from 24 m/sec to 15 m/sec in 12 seconds. What is the automobile’s acceleration? (Remember that a negative value indicates a slowing down or deceleration.)
2. A parachute on a racing dragster opens and changes the speed of the car from 85 m/sec to 45 m/sec in a period of 4.5 seconds. What is the acceleration of the dragster?

3. The cheetah, which is the fastest land mammal, can accelerate from 0.0 mi/hr to 70.0 mi/hr in 3.0 seconds.What is the acceleration of the cheetah? Give your answer in units of mph/sec.
4. The Lamborghini Diablo sports car can accelerate from 0.0 km/hr to 99.2 km/hr in 4.0 seconds. What is the acceleration of this car? Give your answer in units of kilometers per hour/sec.
5. Which has greater acceleration, the cheetah or the Lamborghini Diablo? (To figure this out, you must remember that there are 1.6 kilometers in 1 mile.) Be sure to show your calculations.

8. If a car can go from 0.0 to 60.0 mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50.0 mi/hr?
9. A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0 m/sec2. If the cart has a beginning speed of 2.0 m/sec, what is its final speed?
10. A helicopter’s speed increases from 25 m/sec to 60 m/sec in 5 seconds. What is the acceleration of this helicopter?
11. Below are three situations. In which is the acceleration most similar to the helicopters in question 10?
a. An object going from 0 m/sec to 25 m/sec in 5 seconds.
b. An object going from 0 m/sec to 7 m/sec in 2 seconds.
c. An object going from 5 km/h to 30 km/h in 1 second.

lunes, 1 de septiembre de 2014

physics graph

PHYSICS GRADE: 12TH SPEED PROBLEMS DUE DATE: 05-09-2014

PHYSICS

GRADE: 12TH

SPEED PROBLEMS

DUE DATE: 05-09-2014

A bicyclist travels 60.0 kilometers in 3.5 hours. What is the cyclist’s average speed?

2. What is the average speed of a car that traveled 300.0 miles in 5.5 hours?

3. How much time would it take for the sound of thunder to travel 1,500 meters if sound travels at a speed of 330 m/sec?

4. How much time would it take for an airplane to reach its destination if it traveled at an average speed of 790 kilometers/hour for a distance of 4,700 kilometers? What is the airplane’s speed in miles/ hour?

5. How far can a person run in 15 minutes if he or she runs at an average speed of 16 km/hr?

(HINT: Remember to convert minutes to hours.)

6. In problem 5, what is the runner’s distance traveled in miles?

7. A snail can move approximately 0.30 meters per minute. How many meters can the snail cover in 15 minutes?

8. You know that there are 1,609 meters in a mile. The number of feet in a mile is 5,280. Use these equalities to answer the following problems:

a. How many centimeters equals one inch?

b. What is the speed of the snail in problem 7 in inches per minute?

9. Calculate the average speed (in km/h) of a car stuck in traffic that drives 12 kilometers in 2 hours.

10. How long would it take you to swim across a lake that is 900 meters across if you swim at 1.5 m/sec?

a. What is the answer in seconds?

b. What is the answer in minutes?

11. How far will a you travel if you run for 10 minutes at 2 m/sec?

12. You have trained all year for a marathon. In your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4.5 hours.

a. What is the length of a marathon in kilometers (1 mile = 1.6 kilometers)?

b. What would your average speed have to be to complete the race in 4.5 hours? Give your answer in kilometers per hour.

13. Suppose you are walking home after school. The distance from school to your home is five kilometers. On foot, you can get home in 25 minutes. However, if you rode a bicycle, you could get home in 10 minutes.

a. What is your average speed while walking?

b. What is your average speed while bicycling?

c. How much faster you travel on your bicycle?

14. Suppose you ride your bicycle to the library traveling at 0.5 km/min. It takes you 25 minutes to get to the library. How far did you travel?

15. You ride your bike for a distance of 30 km. You travel at a speed of 0.75 km/ minute. How many minutes does this take?

16. A train travels 225 kilometers in 2.5 hours. What is the train’s average speed?

17. An airplane travels 3,260 kilometers in 4 hours. What is the airplane’s average speed?

18. A person in a kayak paddles down river at an average speed of 10 km/h. After 3.25 hours, how far has she traveled?

19. The same person in question 18 paddles upstream at an average speed of 4 km/h. How long would it take her to get back to her starting point?

20. An airplane travels from St. Louis to Portland, Oregon in 4.33 hours. If the distance traveled is 2,742 kilometers, what is the airplane’s average speed?

21. The airplane returns to St. Louis by the same route. Because the prevailing winds push the airplane along, the return trip takes only 3.75 hours. What is the average speed for this trip?

22. The airplane refuels in St. Louis and continues on to Boston. It travels at an average speed of 610 km/h. If the trip takes 2.75 hours, what is the flight distance between St. Louis and Boston?

23. The speed of light is about 3.00 × 105 km/s. It takes approximately 1.28 seconds for light reflected from the

moon to reach Earth. What is the average distance from Earth to the moon?

24. The average distance from the sun to Pluto is approximately 6.10 × 109 km. How long does it take light from

the sun to reach Pluto? Use the speed of light from the previous question to help you.