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Explain why gases have such low densities in comparison to solids or liquids.

Which element is oxidized in the following reaction? 2 NaBr  +   Cl2   →  2 NaCl   +  Br2

The correct formula of an ionic compound containing Fe+3 and (ClO4)-1 is

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