Chemistry 12-1-22 Moles, Mass, Atoms & Avogadro

CHEMISTRY: So… how big a bucket do you think we’d need to hold a mole of frogs? 🙂

Nope, not the furry brown creature that burrows underground, it’s a whole different thing! Here’s our discussion from Thursday on moles, mass, and Avogadro’s number. I still say he has a cool name… 🙂

flickr photo by Thomas Hawk

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17 thoughts on “Chemistry 12-1-22 Moles, Mass, Atoms & Avogadro

  1. The article I read talked about how the finding of the largest expanses of seagrasses was credited to tiger sharks. Seagrasses can trap carbon for millennia at rates 35 times faster than tropical rainforests. The team estimates that the newly discovered seagrass can hold 630 million metric tons of carbon.

  2. Scientists have discovered that small organisms called cable bacteria are able to clean up sulfates in the Chesapeake Bay. These organisms are thinner than a human hair. These organisms use electrical power to change there surroundings by collecting sulfates, taking its electrons, and transferring those electrons to oxygen. Sulfates are collecting in the ocean, because of the frequent use of fertilizers and sewage wash into the water. These cable bacteria can also break down oil, however, the hydrocarbons will be turned into dangerous sulfates. Another possible use for this is reducing methane pollution from farming. This usage reduces methane production of a rice plant by 93%.

  3. The article I read was about how Mammoths may have gone extinct much earlier than DNA suggests. In 2021, an analysis of plant and animal DNA from sediment samples from the Arctic, about the last 50,000 years, suggested that mammoths survived in north-central Siberia as late as 3,900 years ago. Thousands of years is also how long the animals’ large bones can linger on the ground in the frigid north, slowly weathering and shedding tiny bits of DNA, two researchers write November 30 in Nature. That means that the youngest ancient DNA in sediment samples may have come from such bones, not living mammoths, woolly rhinos and other megafauna.

  4. There is a cloth that changes color when you stretch it. This clothe works because when you stretch light bounces off in a different way. It works because its structure is different from the other. Instead of having a different material for the structure the structure changes when you stretch the material letting you shape it into pictures.

  5. In order to get color in a movie or a photograph it has to stretch. For example, in a movie the light from the projector shines on the screen and the colors bounce back in the film creating waves of colors. These waves create patterns in areas in the layers of the plastic film that are dense and not so dense. The distance of the wavelength always matches up perfectly and creates color in the structure you want. If the color is on stretchy material, when the dense area stretches, the film gets closer, which changes the color of light they reflect.

  6. The article I read about is how pollution is messing up our lungs defense system. Researchers have found that as you get older your lungs get weaker, but especially when inhaled particles of matter are taken in and weakens the lung system. Air pollution is a major cause for disease and early deaths. Researchers have seen that people from 11-94 have donated their lung particles to help those young with bad lungs. To donate you had to be a non-smoker. When lymph nodes get do much build up it causes them to not be able to work anymore. Pollution s ongoing and will not go down without the help of you.

  7. The article I read is about how Physicist have learned how to execute a splashless dive. When Olympic divers dive into a pool they intentionally slice into the pool with a turn. Divers describe that they do want to pull the splash into them. This is to help them minimize the splash. Gregorio, a scientist that studies divers simulated this by duplicating hinged models that bend at the middle, such as divers bend at the hips. Gregorio then dropped them into the water to simulate the way divers dive. She cut angles into the model to simulate the head and arms. Air folded cavities formed under the water which is the same thing that occurs when divers dive. The air filled cavity that is formed prevents the splash from happening in the first place.


  8. Scientists have discovered that dry pet food may be better for your pet than wet food. A Veterinarian’s analysis from San Paulo consisted of more than 900 hundred pet diets shows that nearly 90 percent of calories in wet chow comes from animal sources. That’s roughly double the share of calories from animal ingredients in dry food. This can be bad for animals and the environment.


  9. I read in the science news that the staggering amounts of money T. rex fossils now fetch at auction can mean a big loss for science. At those prices, the public institutions that might try to claim these glimpses into the deep past are unable to compete with deep-pocketed private buyers, researchers say.
    One reason for the sky-high prices may be that T. rex fossils are increasingly being treated more like rare works of art than bits of scientific evidence, Yates says. The bones might once have been bought and sold at dusty “cowboy fossil” dealerships. But nowadays these fossils are on display in shiny gallery spaces and are being appraised and marketed as rare objets of art.

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