When a 10.00 ml sample (density 1.00 g/ml) containing fluoride ion was added to 25.00 ml of zrl2, the absorbance due to the complex decreased from 0.800 to 0.379 in a 1.00 cm cell. if the molar absorptivity of zrl2 is 2.17 x 105 , calculate the concentration (in parts per million) of f- in the sample. hint: do not forget about the dilution!

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

The boiling point of liquids is very high what does it indicate

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false