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Example research essay topic: Test Tube Cm 3 - 802 words

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INFORMATION FOR PROBLEMS 1 - 5: 25 g KNO 3 and 25 g NaCl were place into 7. 2 gcm 3 of water, heated to 70 degrees and filtered. All necessary. 1. How much KNO 3 should be found in the filtrate? 2. Approximately how much NaCl should be found in the filtrate? 3. When filtered at 70 degrees, how much NaCl should be found on the filter 4. When the filtrate is cooled to 20 degrees, how much of the KNO 3 can be expected to crystallize (precipitate)? 5.

About how much NaCl will precipitate in the filtrate as it is cooled to 20 degrees? INFORMATION FOR QUESTIONS 6 - 7: 35 g of NaCl are dissolved in 100 cm 3 of water at 100 degrees and boiled until 30 cm 3 remains. 6. Approximately how many grams of NaCl will remain dissolved in the solution? 7. About how many grams of NaCl will precipitate out of the solution at 100 INFORMATION QUESTIONS 8 - 9: Suppose you dissolve 65 g of KNO 3 100 cm 3 of 8. If you boil away 50 cm 3 of water, how many grams of KNO 3 will remain in the 9.

If the solution in problem 8 with a volume of 50 cm 3 were cooled to 30 degrees, INFORMATION FOR QUESTIONS 10 - 11: You have 100 cm 3 of water at 100 degrees, saturated with both NaCl and KNO 3. 10. If the temperature is lowered to 35 degrees, approximately how many grams of KNO 3 stays dissolved in the solution? 11. If the solution is boiled so the volume is decreased by one half and the temperature is lowered to 23 degrees, how many grams of NaCl will remain in the 12. A small beaker contains 90 cm 3 of methanol (density = 0. 79 g / cm 3). 13. A beaker is found to weigh 30. 50 g. Some isopropanol is added to it and the two weigh 81. 90 g.

If the density of the isopropanol is 0. 79 g / cm 3, how many cm 3 of INFORMATION FOR QUESTIONS 14 - 15: An experiment similar to Lab. 9, Density of Gas, was repeated with a sample of different solid. Mass of solid, test tube, and water before action = 35. 40 g Mass of test tube, and contents after the reaction = 34. 67 g Volume of gas collected = 495 cm 3 14. What was the mass of the gas released in the reaction? 15. The density of the gas released by the reaction is gm / cm 3. INFORMATION FOR QUESTIONS 16 - 17: Object A has a mass of 750 g and density of 5 g / cm 3. Object B has a mass of 600 g and a density of. 2 /cm 3. 16.

Which object would displace the most liquid? 17. If object B were cut in half, then which object, object A or one-half object B, 18. Referring to Table 3. 2 on page 45, n-Butanol is in what physical state at 90 a) solid b) liquid c) gas d) impossible to tell INFORMATION FOR QUESTIONS 19 - 20: Use the graph on page 55. 19. A mass of 30 g KNO 3 is dissolved in 100 cm 3 of water at 25 degrees. The solution is heated to 80 degrees. How many more grams of KNO 3 must be added 20.

A mass of 20 g NaCl is dissolved in 100 cm 3 of water at 75 degrees. As the solution is cooled, at what temperature should a precipitate first appear? 21. A rectangular solid is 3. 2 cm 3 x 3 cm x 2 cm and has a mass of 36 g. Its volume is 22.

Sixty steel cubes are placed in a rectangular box. They are stacked in 5 layers and completly fill the box. Each cube is 1 cm on an edge. How many cubes are 23.

A rectangular bar has a volume equal to 150 small cubes. Which of the following data could be a description of the bar? a) 2 cubes high, 25 cubes long, and 3 cubes wide b) 20 cubes high, 20 cubes long, and 10 cubes wide c) 1 cube high, 1 cube long, and 1 cube long 24. A rectangular bar has a volume equal to 150 small cubes and is placed into a graduated cylinder containing 25 cm 3 of water.

What can we conclude about the volume of the bar if the level of the water changes to 50 cm 3? 25. In an experiment in which copper and sulfur were reacted, the following data tube, cover, copper, and sulfur before reaction = 39. 95 g tube, cover, copper, and sulfur after reaction = 39. 70 g Bibliography:


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