Epic AP Chem Review

This electrode in a voltaic cell gains mass

• anode
• cathode

This electrode loses mass 

• anode
• cathode

Reactions in voltaic cells are

• spontaneous, redox reactions
• non-spontaneous, redox reactions
• spontaneous, non-redox reactions
• non-spontaneous, non-redox reactions

In a voltaic cell, the half cell that receives anions from the salt bridge is

• cathode
• anode

In a voltaic cell, the half cell that receives cations from the salt bridge is

• cathode
• anode

The following reaction has a ΔG^ₒ value of 48.47 kJ/mol at 25^ₒC.
HB(aq) + H₂O(l) <-> H₃O⁺(aq) + B^-(aq)
Calculate K_a for the acid HB.

• 0.981
• -19.6
• 4.85 x 10^-5
• 3.19 x 10^-9

Which energy conversion shown below takes place in a galvanic cell?

• electrical to chemical
• mechanical to chemical
• mechanical to electrical
• chemical to electrical

Consider the following numbered processes:
1. A -> 2B
2. B -> C + D
3. E -> 2D
ΔH for the process A -> 2C + E is

• ΔH₁ + ΔH₂ + ΔH₃
• ΔH₁ + ΔH₂ 
• ΔH₁ + ΔH₂ - ΔH₃
• ΔH₁ + 2ΔH₂ - ΔH₃

Consider the following processes:
I.  condensation of a liquid
II. increasing volume of an ideal gas at constant temp
III. dissolving sugar in water
IV. heating 1.0 mol of an ideal gas at constant volume
For how many of these is ΔS positive?

• 0
• 1
• 2
• 3

For the reaction A + B -> C + D, ΔH^ₒ = +40 kJ and ΔS^ₒ = +50 J/K. Therefore, the reaction under standard conditions is

• spontaneous at temps > 10K
• spontaneous at temps > 800K
• spontaneous at temps between 10K and 800K
• spontaneous at all temperatures