Driving Force of Reactions

Which process is accompanied by a decrease in entropy?

• boiling of water

• condensing of water vapor

• subliming of iodine

• melting of ice

Systems in nature tend to undergo changes toward

• lower energy and less disorder

• lower energy and more disorder

• higher energy and less disorder

• higher energy and more disorder

Tags

NGSS.HS-PS3-4

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

Tags

NGSS.MS-PS1-4

Which sample has the lowest entropy?

• 1 mole of KNO3(l)

• 1 mole of KNO3(s)

• 1 mole of H2O(l)

• 1 mole of H2O(g)

The following statements are true for entropy EXCEPT

• entropy is the measure of molecular disorder

• entropy is greater if matter is more dispersed

• gases have more entropy than liquids of the same substance and temperature

• lowering the temperature causes entropy to increase.

Tags

NGSS.HS-PS3-4

Entropy increases from solid, liquid to gas. Why?

• Molecular disorder increases
• Molecular randomness decreases
• Molecules are more energetic
• Molecules are more reactive

Tags

NGSS.MS-PS1-4

The SI unit of heat and energy is the __________.

• calorie
• heat
• joule
• watt

Heat transfer [blank] occurs from hot to cold. 

• always
• never
• sometimes
• rarely

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