For absorption spectra to exist partially absorbent material must exist between (a) the light source and the spectroscope slit.(b) the spectroscope must be equipped with an absorption cell.(c) the light source must be a gas.(d) all of the above.(e) none of the above.

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

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