Which of the following is NOT evidence that a chemical change may have occurred? a. Difference in shape
b. Release of energy
c. Bubbles forming
d. Change in color​

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?

Consider the total ionic equation below. what are the spectator ions in this equation? h+ and oh- h+ and ba2+cro2-4 and oh- cro2-4 and ba2+

What is the ima of the lever pictured? -9.0 m -3.0m fast