Enthalpy, Entropy, Free Energy

The SI unit of heat and energy is the __________.

• calorie

• kelvin

• joule

• watt

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

• first

• second

• third

• zeroth

ΔH value in an endothermic reaction is a positive number.

• True
• False

Which phase of matter has the greatest motion and least orderly arrangement?

• solid
• liquid
• gas

The rate of a chemical reaction is unrelated to the spontaneity of the reaction.

• True

• False

If 25 J are required to change the temperature of 5.0 g of substance A by 2.0°C, what is the specific heat of substance A? 

• 250 J/g °C

• 10 J/g °C

• 63 J/g °C

• 2.5 J/g °C

6.  The formation 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 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

Δ S is negative indicates that_______.

• enthalpy increases

• enthalpy decreases

• entropy decreases

• entropy increases

ΔG is negative indicates that_______.

• reaction is exothermic

• reaction is endothermic

• reaction is spontaneous

• reaction is not spontaneous