Two separate substances, each containing carbon, hydrogen, and oxygen, both react with acids and have the same pH level. Only one of the samples conducts electricity when dissolved in water. which is the best description for these substances? a) they are two different acids
b) they are an acid and a base
c) they are two different compounds
d) they are both the same compound

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.