Addition of Tl1+ ion to the solution had no apparent effect (all ions remained in solution), but addition of Ba2+ ion resulted in a precipitate. Which anion is present?

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Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule