Homework Answers
Answer:
- Explanation 1: the simple of benzophenone is not pure. The presence of impurities or humidity will cause a decrease in the melting point (or freezing point) of benzophenone. Small amounts of impurities will cause small decrease in freezing point, whereas high amounts of impurities cause a great decrease in freezing point.
- Explanation 2: you are working at an altitude different from sea level. The melting points of compounds are reported considering the atmospheric pressure of 1 atm (that means that you are at level sea). If you are working at any altitude over sea level, the atmospheric pressure will be less than 1 atm. Then, melting point of benzophenone pure will be lower than 48.1 °C. This is because pressure changes modify the melting point and the boiling point of any substance.
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Pure benzophenone melts at 48.1°C. Your sample of benzophenone began to freeze at 47.0°C. When you repeated this me...
Pure benzophenone melts at 48.1 degree C. Your sample of benzophenone began to freeze at 47.0...
Pure benzophenone melts at 48.1 degree C. Your sample of benzophenone began to freeze at 47.0 degree C. When you repeated this measurement, the sample again began to freeze at 47.0 degree C. Give at least two reasonable explanations for this observation. You tried to read the thermometer when your solution containing the unknown began to freeze but were not certain if the reading was 43.5 degree C or 44.0 degree C so you decided to repeat this try melting...
Pure benzophenone melts at 48.1 degrees Celsius. Your sample of benzophenone began to freeze at 47...
Pure benzophenone melts at 48.1 degrees Celsius. Your sample of benzophenone began to freeze at 47 degrees Celsius. When you repeated this measurement, the sample again began to freeze at 47 degrees Celsius. Give at least 2 reasonable explanations for this observation.
You tried to read the thermometer when your solution containing the unknown began to freeze but...
You tried to read the thermometer when your solution containing the unknown began to freeze but were not certain if the reading was 43.5 degrees celsius or 44.0 degrees celsius so you decided to repeat this by remelting the solidifying mass. The new reading you observed was clearly 41.0 degrees celsius. What happened?
AIR choose the classification below that is most appropriate: A) pure element B) pure compound C)...
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Please help me, I wasn't sure which test to use so I did both of them on excel. Please let me know which is correct and answer A-C. I will give the answer a thumbs up if you can get back to me asa...
Please help me, I wasn't sure which test to use so I did both of
them on excel. Please let me know which is correct and answer A-C.
I will give the answer a thumbs up if you can get back to me
asap.
The physicians also believe that people who are obese are more
likely to die earlier than those who are not. Again use the data in
the Framingham sample to test this theory by comparing the mean...
Pure benzophenone melts at 48.1 degree C. Your sample of benzophenone began to freeze at 47.0 degree C. When you repeated this measurement, the sample again began to freeze at 47.0 degree C. Give at least two reasonable explanations for this observation. You tried to read the thermometer when your solution containing the unknown began to freeze but were not certain if the reading was 43.5 degree C or 44.0 degree C so you decided to repeat this try melting...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
4. 15 marks) Let C denote the concentration of paracetamol in your blood. When you take the parac- etamol C goes up quickly and then declines slowly over the next few hours, as your liver clears the drug from your body (or as the drug gets metabolised or excreted) Here are some typical data.1 The "test drug" and "reference drug" refer to two slightly different forms of paracetamol; the data show how the test version of the drug is absorbed...
You sometimes create a spark when you touch a doorknob after
shuffling your feet on a carpet. Why? The air always has a few free
electrons that have been kicked out of atoms by cosmic rays. If an
electric field is present, a free electron is accelerated until it
collides with an air molecule. It will transfer its kinetic energy
to the molecule, then accelerate, then collide, then accelerate,
collide, and so on. If the electron’s kinetic energy just before...
Please help me, I wasn't sure which test to use so I did both of
them on excel. Please let me know which is correct and answer A-C.
I will give the answer a thumbs up if you can get back to me
asap.
The physicians also believe that people who are obese are more
likely to die earlier than those who are not. Again use the data in
the Framingham sample to test this theory by comparing the mean...
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