The dependent variable: Temperature Essay

Pour/place 2 cups of tap water into the clean small pot. Heat the pot to boiling. Use the digital thermometer. Record the temperature when the pot reaches a rolling boil. 2. Discard the water down the sink. Allow the pan to cool, then rinse and dry it. 3. Add one tablespoon of table salt to the two-cup measuring cup. 4. Add enough tap water to ring the volume to two cups. . Pour this salt solution into the clean small pot. Heat the pot to boiling. Use the digital thermometer. Record the temperature when the pot reaches a rolling boil. 6. Discard the water down the sink. Allow the pan to cool, then rinse and dry it. 7. Add two tablespoons of table salt to the two-cup measuring cup. 8. Add enough tap water to bring the volume to two cups. 9. Pour this salt solution into the clean small pot. Heat the pot to boiling. Use the digital thermometer. Record the temperature when the pot reaches a rolling boil. 10. Discard the water down the sink. Allow the pan to cool, then rinse and dry it. 1. Add three tablespoons of table salt to the two-cup measuring cup. 12. Add enough tap 13 Pour this salt solution into the clean small pot. Heat the pot to boiling. Use the digital thermometer. Record the temperature when the pot reaches a rolling boil. Data Record the data you collected in the lab. (The data table and the graph. ) Table 2. Boiling point temperatures of various salt solutions. Beaker/Concentration of Niacin (M) Boiling Point Temperature Analysis Analyze the data you collected in the lab. How does the data presented above relate to the hypotheses you generated earlier in lab?

Are any hypotheses disproved by your experiment? Use your graph to determine the boiling point of a solution made with 2 h tablespoons. This use of a graph has generated a hypothesis that a 2 h tablespoon solution boils at _219_degrees F. Prepare a 2. 5 M solution and verify your hypothesis. Correct! ;Is the hypothesis correct? Yes. Adding table salt to water causes the water to boil at a higher temperature. ;Problems with doing the experiments. The temperature readings were hard to make. Gloves had to be worn to keep my hands from getting too hot. Had to be careful that the stove heat was not hitting the hermetic. Other things learned. Be careful when adding salt to boiling water. It makes the water boil vigorously for a second or two. Conclusion After conducting the experiment, how would you now explain the problem(s) or answer the question(s) raised when you described the purpose of the lab? Be sure to base your answer on the data you collected. If you are given a solution of unknown concentration, can you determine its concentration? Explain. Yes you can, however you need the chemical compound name, now many grams tot that chemical compound was used, and the liters that it was mixed with

Additional questions for this lab: Notebook Activity: How do you apply the scientific method in everyday life? List examples. Deductive reasoning. Process of elimination. Step by step approach to doing things. Notebook Activity: Conversions between units If there are 1000 meters in a kilometer, how many meters are there in 0. 05 km? 50 If there are 1,000,000 micrometers (pm) in a meter, how many pm are there in one millimeter (mm)? 1000 If an object is 334 pm wide, how many mm wide is it? Ion-3=0. 334 If we have one Liter of a solution, how many millimeters (ml) is that? 1000 Did your TAP water boil at 100 degrees C?

If not, what might account for this? Yes An experimental control is a test that lacks the experimental variable. Was one of the solutions prepared in this lab a control? If so, which one? Nasal In our experiment, you controlled one of the factors. Which one (temperature or Nasal concentration) was it? Nasal This factor was the independent variable; it was controlled by you, the experimenter. The other variable was a consequence of changes you made. This is the dependent variable. It was a consequence of changes in the independent variable. What factor (temperature or Nasal concentration) was the dependent variable? Temperature