Entropy and Enthalpy

What is the definition of entropy?

• Measure of disorder in a system

• Internal energy stored within a system

• Number of possible arrangements of particles and their energies in a system

• The change in number of molecules and their energies in a system

If any, is the entropy change of this reaction positive or negative?

• Negative

• No Change

• Positive

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

How does increasing temperature affect entropy and why?

• Entropy decreases as kinetic energy decreases, so particles are more stable

• Entropy increases as kinetic energy increases, so energy arrangements of particles increase

• Entropy decreases as kinetic energy increases, so level of disorder decreases

• Entropy increases as kinetic energy decreases, so rate of reaction decreases

What is the formula for Gibbs free energy?

• G = H * TS

• G = H + TS

• G = H / TS

• G = H - TS

What is the standard unit for change in entropy?

• J/mol

• J/K/mol

• Pa/s

• W/K

When change in entropy is negative, how does increase in temperature affect the reaction?

• Reaction becomes less feasible

• Reaction becomes more feasible

• No change

Tags

NGSS.HS-PS1-5

When ionic salt dissolves in water what happens to entropy?

• Increase

• No change

• Decrease

When change in entropy is positive, how does increase in temperature affect the reaction?

• Reaction becomes less feasible

• Reaction becomes more feasible

• No change

Tags

NGSS.HS-PS1-5

When does entropy in a reaction increase?

• Change from solid to liquid

• Change from liquid to solid

• Change from liquid to gas

• Change from gas to liquid

If number of gaseous molecules decreases after the reaction, what happens to entropy?

• Increases

• Decreases

• No change