3. What is the primary difference between a molecule and a
compound?
A. All molecules are compounds,
but not all compounds are
molecules
B. Molecules always contain only
one type of atom, unlike
compounds
C. Compounds must be composed
of more than one type of atom
D. Molecules must be composed of
more than one type of atom

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90