Which of the following is the best definition of a base?
A. Bases are substances that donate protons.
B. Bases are substances that accept electrons.
C. Bases are any substances without hydroxide ions.
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D. Bases are substances that release hydroxide ions.

The electromagnetic force acts between what

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?

Which of the following are sources of revenue for media companies? a. direct sales to producers b. advertising and subscriptions c. online purchase d. capital investments