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Write the balanced net ionic equation for the reaction consisting of the two half-reactions given. Cu –> Cu2+ + 2e– Au3+ + 3e––> Au

The Lewis structure of the cyanide ion is shown here.  How many valence electrons are in this ion?  -1:C = N:  

  In H3C-BCl2 , which atom does NOT have a complete valence? ( Hint: you may need to draw the Lewis structure first)

ClO2⁻  ion    1 pts: Draw the lewis structure of the ion shown above 2 pts. Calculate the number of valence electrons: Show your work  2 pts. Calculate the formal charge of Cl. 2 pts. Calculate the formal charge for each Oxygen.

Energy is often stored in the form of chemical bonds.  This is a type of ___.

Consider the reaction below. How much heat is absorbed if 5.00 moles of nitrogen react with excess oxygen? 2 N2 (g) + O2 (g) –> 2 N2O (g)     ΔHrxn =  +163.2 kJ    

The dissolving of ammonium nitrate (NH4NO3 = 80.06 g/mol) in water can be described by the following: NH4NO3 (s) –> NH4NO3 (aq)                  DH = +25.4 kJ   How much heat will be absorbed when 175 g of sodium acetate dissolves in water?

Given the accompanying partial activity series, which of the following elements can reduce copper(II) to elemental copper? Zn –> Zn2+ + 2e– Fe –> Fe2+ + 2e– Co –>Co2+ + 2e– Ni –>Ni2+ + 2e– Cu –>Cu2+ + 2e–

The reaction between copper and hydrochloric acid is best represented by which of the following? * hint: look at the activity series 

A sample of ammonium chloride dissolves in water, absorbing heat from the surrounding water, and causing the temperature to drop by 20 °C.  If the heat change for the reaction is +300 J, what is the heat change for the surrounding water?