Unit 6 Analysis Of Alum Lab Answers
1) Heading a. Analysis of Alum b. September 8,2010 – September 10,2010 c. Asad Mehmood d. Lab Partner: Alec Drey, Sarah Schrader, Seth Kerrey 2) Purpose e. Research Problem: Is what we have alum? In this lab, we will be analyzing alum by doing three different tests. The first will be to find the melting point, the second to find the amount of water in alum, and the third is to find the percent sulfate. We expect the values to be close to the actual. f. Variables: i. Independent 1. The temperature the hot plate was at 2. The amounts of alum used 3. The temperature heated at 4. The number of times filtered ii. Dependent 5. The time in which the compound melted and the melting point calculated 6. The amount that we get back after the experiment
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Why must objects be cool before their mass is found on a sensitive balance? xvii. It is important because the rising hot air from objects will affect the reading on the balance. The hot current upward will “lift” the object thus altering the reading. o. Comment on the results of the different test you used to verify that the substance tested was alum. xviii. The various test used to determine that the substance tested was alum were truly necessary for any experiment. The results that I received were very accurate to the actual values which overall means that I can accept the fact that what I have is alum. Even though part 3 was off, the other two tests can solidify that I have alum. p. Explain why it is important to use more than one test to verify your substance. xix. It is very important to use more than one test to verify the substance because lots of substances have very similar characteristics. By looking at a different test each time, we can narrow down the substance to a particular one which in this case is
Why must objects be cool before their mass is found on a sensitive balance? xvii. It is important because the rising hot air from objects will affect the reading on the balance. The hot current upward will “lift” the object thus altering the reading. o. Comment on the results of the different test you used to verify that the substance tested was alum. xviii. The various test used to determine that the substance tested was alum were truly necessary for any experiment. The results that I received were very accurate to the actual values which overall means that I can accept the fact that what I have is alum. Even though part 3 was off, the other two tests can solidify that I have alum. p. Explain why it is important to use more than one test to verify your substance. xix. It is very important to use more than one test to verify the substance because lots of substances have very similar characteristics. By looking at a different test each time, we can narrow down the substance to a particular one which in this case is