This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: You have had something simmering in a covered pot on the stove and then turn off the heat. Some time ... (Read 50 times)

kamilo84

  • Sr. Member
  • ****
  • Posts: 495
on: Jul 29, 2018
You have had something simmering in a covered pot on the stove and then turn off the heat. Some time later you return to the pot and find that you have trouble lifting the lid. Why?
 
  What will be an ideal response?

Question 2

The activity of a sample reduces from 7.55  109 Bq to 5.11  109 Bq in 5.50 months.
 
  (a) What is the half life?
  (b) How many months must one wait for the activity to decrease to 10?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

trog

  • Sr. Member
  • ****
  • Posts: 343
Reply #1 on: Jul 29, 2018
Answer to Question 1

During simmering, the vapor pressure of the water is sufficient to lift the lid a small amount so that steam can escape, so it is slightly above atmospheric pressure. Once the contents of the pot have cooled, the vapor pressure is reduced considerably, and, if the pot is sealed by the lid so no air can leak in, there will be a significant difference in pressure between the inside and the outside, making it difficult to lift the lid.

Answer to Question 2

(a) 9.77 months
(b) 32.4 months


kamilo84

  • Member
  • Posts: 495
Reply 2 on: Jul 29, 2018
Excellent

flexer1n1

  • Member
  • Posts: 373
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

Did you know?

After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

Countercurrent heat exchange in the lateral muscles of bluefin tuna. Countercurrent heat exchange in the lateral muscles of bluefin tuna.
Drug development time line. Drug development time line.
Different time courses of hypersensitivity reactions. Different time courses of hypersensitivity reactions.
Time course of HIV infection. Time course of HIV infection.
Turn the baby over and end with passive touch on the head. Gently hold the baby’s head and look ... Turn the baby over and end with passive touch on the head. Gently hold the baby’s head and look ...
Over time, cells acquire mutations. Two independently acquired mutations in the same cell may be suf Over time, cells acquire mutations. Two independently acquired mutations in the same cell may be suf
Video: Darwin's Observation (Fossils, Galapagos Islands & Africa ) and Natural Selection (Adaptive Traits)

For a complete list of videos, visit our video library