Thermodynamics Quiz

According to the First Law of Thermodynamics, energy can be:

• Created and destroyed

• Neither created nor destroyed

• Only created

• Only destroyed

What does thermodynamics tell us about a reaction's spontaneity?

• The amount of energy present

• The speed of the reaction

• The pathway from reactants to products

• Only the properties of reactants and products

What is a spontaneous process?

• A process that occurs with outside intervention

• A process that occurs without outside intervention

• A process that decreases entropy

• A process that requires energy to be created

Entropy is a measure of:

• Energy conservation

• Molecular randomness or disorder

• Reaction speed

• Number of reactants

Positional entropy increases when going from:

• Gas to liquid

• Liquid to solid

• Solid to gas

• Gas to solid

What happens to the entropy of the universe in any spontaneous process?

• It decreases

• It remains constant

• It increases

• It fluctuates unpredictably

According to the Second Law of Thermodynamics, the total energy of the universe is:

• Decreasing

• Increasing

• Constant

• Fluctuating

What does a positive ΔS_universe indicate about a process?

• The process is spontaneous in the direction written

• The process is spontaneous in the opposite direction

• The process has no tendency to occur

• The system is at equilibrium

What is the effect of exothermic reactions on the entropy of surroundings according to Section 17.3?

• They decrease the entropy of surroundings.

• They have no effect on the entropy of surroundings.

• They increase the entropy of surroundings.

• They only affect the entropy at high temperatures.

What is the sign of ΔS_surroundings for endothermic reactions?

• Positive

• Negative

• Zero

• Cannot be determined