Which is the chemical formula for iron(ii) chloride tetrahydrate? a. fecl2•4h2o b. fecl3•6h2o c. fecl2•3h2o d. fecl3•4h2o

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils