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Refer to the structural formula given below:  Is this molecule polar or nonpolar? 

What happens to the temperature of water during a phase change? (Response should be one of the following: increases, decreases, stays constant)

The correct name for MgBr2 is

Which of the following choices best classifies the following reaction:  Na2(SO4)   +   Pb(NO3)2    Pb(SO4)  +  2 Na(NO3) a. combination b. single replacement c. decomposition d. double replacement  e. redox f.  nonredox

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

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