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Which element is reduced in the following reaction?  Zn  +   2 HCl   →  ZnCl2   +  H2

Determine the oxidation number of the underlined element in the following compound. Be sure to indicate if the oxidation number is positive or negative. NaClO4

Balance the equation below by placing the correct coefficients in the blanks. Your response should list the coefficients in order from left to right, separated only by commas; no spaces. If no coefficient belongs in a blank, represent it with a “1”. For example the equation 2 H2O →  2 H2+O2 would be represented as 2,2,1.    ____H2(SO4) +____Cr   →  ____Cr2(SO4)3 + ____H2  

The change from the liquid state to the vapor state that occurs only at the surface of the liquid is called ____.

The correct name for the molecular compound N2O3 is

In a oxidation-reduction reaction, the reducing agent is:

Look at the heating/cooling curve for water diagrammed below. Between which two letters is the phase changing of freezing taking place? Response should be in the form “x and y”. 

What intermolecular forces exist between nonpolar molecules?

The direct change from the vapor state to the solid state is called

Look at the heating/cooling curve for water diagrammed below. Between which two letters is water existing as a solid? Response should be in the form “x and y”.