What tools can you use to conduct a scratch test that uses the Mohs Hardness Scale to determine the object's hardness? There is more than one right answer. Check all that apply. A screwdriver
A fingernail
A piece of chalk
A diamond
A copper penny
A steel nail

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 is the formula of the ionic compound composed of calcium cations and chloride anions

Select the correct lewis structure for fluorine which is group 7a element?