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Final Exam Review Questions/Suggestions1. If a 10. kg rock is placed on a cliff 80. meters high, how much potential energy does it possess? 2. What are 4 advantages of CO2 fire extinguishers? 3. Given a rocket in space traveling at 25 m/s that accelerates up to 30. m/s over a period of one minute, what would be the acceleration of that rocket in m/s^2? 4. 10 moles of carbon (IV) oxide contains _______ molecules? 5. Why is the thermal conductivity of metals so much greater than wood products? 6. What is the kinetic energy of a bullet (mass = 0.0200 kg) fired at a muzzle velocity of 1.05 m/s? 7. Calculate the formula mass for sodium carbonate: 8. Give one important reason why thermal expansion is useful in the production of liquid thermometers: 9. Give the names of several substances that undergoes sublimation: 10. Calculate the weight of an object with a mass of 10.5 kg: 11. Given 20. grams of water at 100 degrees C, how much energy in calories is needed to convert it all to steam at the same temperature: 12. List several important safety considerations for our hydrogen gas generation demonstration: 13. Calculate the final velocity of a small object dropped 0.45 m in an airless environment: 14. Calculate the final temperature of a block of gold (initially at 30.0 degrees C) that has a mass of 1.40 g and has 10.80 calories of heat added to it (the cp of gold = 0.030 cal/g x degreeC) 15. Give examples of endothermic reactions as well as a description 16. Balance the following chemical equation: 17. The slope on a velocity versus time graph gives a measure of the: 18. List several exothermic chemical reactions and give a description 19. Describe intermolecular forces 20. what is the special version of the velocity formula for train stop problems? 21. List the four reaction types (general ones - you will have to recognize them on exam) 22. 3.50 grams of ice at -5 degrees C would require how many calories of heat to be turned into steam at 150 degrees C: 23. Identify the following changes as chemical or physical: melting ice, burning coal, sanding wood 24. Convert 15.0 km/s to m/hour 25. Given an initial temperature of 40.0 degrees C, an initial pressure of 4.0 atm., what would be the final pressure if the temperature were decreased to 10.0 degrees C.? 26. Which of the following is not a value for atmospheric pressure (standard at sea level): 27. When someone with high amount of stomach acid takes an antacid tablet, this attempts to change the pH: 28. Extending a graph line beyond known data but in a fashion consistent with the actual data is known as: 29. The process of estimating values on graphs between known data points is called: 30. For pure samples of any material, phase changes occur without any change in the? 31. That which can cause a change in the velocity of an object is called? 32. The acceleration of gravity must be calculated at sea level: true or false 33. Our distillation of an alcohol/water mixture was possible due to a: 34. That method of head transfer involving movement of areas of hot fluids in circular motion with cooler fluids is: 35. A plane is flying along at 500.0 m at a speed of 200 km/hour. What distance prior to the target must the object be dropped to insure a hit (assuming no air resistance): 36. When a ping-pong ball is dropped, it accelerates for a time then continues on at a constant velocity. This constant velocity is known as: 37. When two object are in thermal equilibrium they: 38. The melting point of ice is the temperature at which any additional heat is used to: 39. The sugar dehydration demonstration showed a chemical change in which ______ was removed from the sugar: 40. The boiling point of water at 1 atm of pressure is: Final Exam Answers1. P.E. = mgh P.E. = (10. kg)(9.8 m/s^2)(80. m) = 7.8 E 3 J 2. does not conduct electricity, cold, sublimates to smother, no water damage for cleanup 3. 8.3 m/s^2 4. 6.02 E 24 mlcl CO2 5. The freedom with which the electrons move about in the metal allows the heat to be dispersed throughout the metal. The wood is made up of nonmetals and other organic molecules that hold on to their electrons much more strongly (high electronegativity) 6. K.E. = 1/2mv^2 answer = 1.10 E -2 J 7. Na2CO3 fm= 106 g 8. Materials used as the liquid must expand the same amount for the same change in temperature every time over as large a range as possible. Otherwise the numbers and markings on the thermometer would needed to be at different distances apart. 9. camphor, naphthalene, dry ice, paradichlorobenzene, even ice can turn directly into a gas under the right conditions 10. weight = mass x gravity 103 N 11. Q = mass x heat of vaporization 10 800 calories 12. keep all flames away from generator, thistle tube must extend to bottom of generator, mix acid and water correctly, do not capture or test the first gas that comes through delivery tube 13. Vf = Vs + at 4.4 m/s 14. 287 degree C (Q = m x change in temp x cp) 15. photosynthesis, electrolysis reaction continues to absorb energy as long as it is available 16. coefficient ratio = 1, 6, 3, 2 17. acceleration of that object 18. oxidation, mixing acid with water, sugar dehydration reaction gives off more heat than is used to start reaction 19. intermolecular forces are potential energy forces of attraction between molecules in solids and liquids 20. Vav = d(total) / t(total) 21. synthesis, decomposition, single displacement, double displacement 22. 2 600 calories needed 23. melting ice (physical), burning coal (chemical), sanding wood (physical) 24. 5.4 E 7 m/hr 25. -270 degrees C (hint: did you convert to Kelvin?) 26. E 27. A 28. extrapolation 29. interpolation 30. temperature 31. force 32. False - within a planetary diameter the results will be similar 33. large enough difference in the boiling points of the two liquids 34. convection 35. 0.56 km 36. terminal velocity 37. are at the same temperature and will no longer transfer heat energy between them 38. cause melting with no rise in temperature 39. water 40. 100 degrees C (I'm tired)
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Page Last Updated: Friday March 02, 2007 Webmaster: Larry Jones Pickens County School District |