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An atom lost all of 2 valence electrons resulting in a configuration of 1s22s22p63s23p2.  The identity of this ion is ___.

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What is the frequency of a photon of light with a wavelength of 615 nm?  Answer in the correct number of significant figures.  You must show all your work and submit an image of your work to receive credit. Work must be in your own writing. 

Based on the balanced equation, how many moles of H2O can form from the reaction of 6 moles of CH4? CH4 (g) + 2 O2 (g)  –> CO2 (g)  + 2 H2O (g)

A chemist carries out this reaction in the laboratory, using 4.31 grams of zinc and an excess of sulfur: Zn + S –> ZnS From the balanced equation, she calculates that she should obtain 6.41 grams of zinc sulfide.  However, she isolates only 5.01 g of product.  What is her percent yield for this reaction?

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Water has the formula H2O.  Water can be made from the reaction of hydrogen and oxygen.  If [x] g of hydrogen react fully with [y] g of oxygen, then ____ of water is made.

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In the SI system of measurement, the unit of mass is the 

What is your favorite subject? Hint: This is a HISTORY class.