Thermodynamics - entropy and free energy

The __________ law of thermodynamics states that entropy is always increasing. 

• first
• second
• third
• zeroth

Temperature is a measure of average [blank] energy of individual atoms.

• heat
• potential
• mechanical
• kinetic

The equation that relates enthalpy, temperature and entropy is

• Hess's Law
• Second Law of Thermodynamics
• Gibbs Free Energy
• Calorimetry

 For which of these processes is the value of ΔH expected to be positive?
1.  The temperature increases when calcium chloride dissolves in water.
2.  Steam condenses to liquid water
3.  Water boils
4.  Dry ice sublimates

• 4 only
• 1 only
• 3 and 4 only
• 2 and 3 only

6. The compound CAB₄ formed as shown below

½ A₂ + 2 B₂ + C --> CAB₄ has an enthalpy of formation of -104 kJ and a change in entropy of -60.8 J/K at 30 °C. What is the free energy change and spontaneity of the reaction?

• -85.6 kJ, spontaneous

• -18.3 kJ, not spontaneous

• +18.3 kJ, spontaneous

• +85.6 kJ, not spontaneous

Δ H is negative indicates that_______.

• reaction is exothermic

• reaction is endothermic

• reaction is spontaneous

• reaction is not spontaneous

Which of these would ALWAYS give a spontaneous process?

•  $\Delta H\ is\ +\ \Delta S\ is\ +$  

•  $\Delta H\ is\ -\ \Delta S\ is\ -$  

•  $\Delta H\ is\ +\ \Delta S\ is\ -$  

•  $\Delta H\ is\ -\ \Delta S\ is\ +$  

The reaction $2\ H_{2\left(g\right)}+O_{2\left(g\right)}\rightarrow\ 2\ H_2O_{\left(g\right)}$  shows 

• no change in entropy

• an increase in entropy

• a decrease in entropy

At what temperature would a given reaction become spontaneous if ΔH =+119kJ and ΔS=+263J/K.mol

• 452 K

• 0.45 K

• 382 K

• 179 K

A reaction has a negative ΔH and a negative ΔS. Which of the following is true?

• It will be spontaneous at all temperatures.

• It will be nonspontaneous at all temperatures.

• It will be spontaneous at low temperatures.

• It will be spontaneous at high temperatures.