An average gold atom has a diameter of 2.6 Angstroms. How many gold atoms can line up side-by-side to go around a gold ring with circumference 54.5 millimeters? (1A= 1x10-10m)

(1m= 1000mm)

Predict the products butane (c4h10) + oxygen —>

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

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?