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 56 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

isabelt_18

  • Member
  • Posts: 342
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Did you know?

Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

The Serial Reaction Time Task The Serial Reaction Time Task
In the heat of the Battle of Lake Erie, Perry had to abandon his flagship, the Lawrence, which had b In the heat of the Battle of Lake Erie, Perry had to abandon his flagship, the Lawrence, which had b
Attention and memory are in demand during circle time. Attention and memory are in demand during circle time.
Drug development time line. Drug development time line.
Latent Heat Latent Heat
Neither heat-killed S-type nor live R-type bacteria can kill mice, but simultaneous injection of bot Neither heat-killed S-type nor live R-type bacteria can kill mice, but simultaneous injection of bot
Video: Cytotoxic T cell receptors, activation, proliferation, differentiation & action

For a complete list of videos, visit our video library