Alight wave traveling through an unknown medium strikes the boundary with
water at a 45° angle and then refracts toward the boundary. what could the
unknown medium be?
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a. glass
o
b. air
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c. water
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d. diamond

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)