Choose the element from the list that best fits this description: "This element is in a family of elements that have characteristics of both metals and
nonmetals. It is often use as a semi-conductor in electric circuitry, but it is not
malleable."
Tellurium (Te)
Calcium (Ca)
Sodium (Na)
Argon (Ar)

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?