Homework #45: Kinetics/Equilibrium Day 1-5

Entropy measures which of the following about a chemical system?

• Activation energy of the system
  

• Intermolecular forces of the system

• Energy change of the system

• Disorder of the system

Which phase of matter has the most entropy

• solid

• liquid

• gas

• depends on temperature

Tags

NGSS.HS-PS3-4

Which phase of matter has the least entropy

• solid

• liquid

• gas

• depends on temperature

Given the change of phase:

CO₂(g) —> CO₂(s)

As CO₂(g) changes to CO₂(s), the entropy of the system

• decreases

• increases

• remains the same

• depends on temperature

Which of these reactions shows a DECREASE in entropy?

• CaCO₃(s) → CaO(s) + CO₂(g)

• 3O₂(g) → 2O₃(g)

• 2NH₃(g) → 3H₂(g) + N₂(g)

• C₆H₆(l) → C₆H₆(g)

The entropy will usually increase when

• a molecule is broken into two or more smaller molecules

• a reaction occurs that results in an increase in the number of gases

• a solid changes to a liquid

• all of these

The entropy will usually increase when

• a molecule is broken into two or more smaller molecules

• a reaction occurs that results in an increase in the number of moles of gas

• a solid changes to a liquid

• all of these

Which phase change represents a decrease in entropy?

• solid to liquid

• gas to liquid

• liquid to gas

• solid to gas

What letter represents the energy of the products?

• A

• B

• C

• D

• not listed

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What letter represents the energy of the reactants?

• A

• B

• C

• D

• not listed

Tags

NGSS.HS-PS1-4